Loan (or sell) a fault code reader for an OBDII

[Delta66]

My ABS warning light has come on and I have the OBDII in the centre consul. Volvo want near £130 to do a diagnostic check. I understand it will not work with cheap OBD readers off ebay.

There was a suggestion to make a code reader and I have searched through various threads, the problem is many are missing diagrams, photos and none are super clear as what to do.

So, has anyone got one and would be prepared to lend, or even sell me one?

[psl]

I've a home made obd2 reader. Has worked well for me over the years. Your welcome to borrow it to try the codes.
Send me a pm with your details for posting

[Delta66]

PM sent with details. Thanks.

[Delta66]

Loan sorted and postage paid. Next, how does it work?

[psl]

General Notes on On-Board Diagnostics in Volvo RWD Cars.

[Motor Magazine] Volvo started using self-diagnostics on its Bosch LH 2.4 engine management systems in 1988 on 700 series non-turbo cars and in Regina-equipped cars. Turbo cars did not have this until model year 1990. If a system fault occurs, then the "check engine" lamp will illuminate, signifying the presence of a fault code. For every model year up to and including the '95s (except 200 series DLs and GLs), you can flash out fault codes, as well as perform input and output testing, through the OBD-I diagnostic connector unit. As electronic systems were added to more Volvo models, more socket options and even more diagnostic connectors were added, as well. 1996+ cars have the OBD-II system which requires a computer scanner to read codes.

The diagnostic connector units for OBD-I systems are small black rectangular boxes mounted in front of the driver-side shock tower. Earlier cars have only one unit; later cars have Underhood Diagnostic Box two. Diagnostic connector A contains the test terminal probe used in both A and B. In diagnostic connector A, socket 1 is for the electronic transmission (if your 960 or 90-series car has the AW30/40), socket 2 for fuel injection or Motronic, socket 3 for ABS, socket 6 for ignition and socket 7 for the instrument cluster. If the 1992+ car is so equipped with connector B, socket 1 is for the climate control, socket 2 for cruise control, socket 5 for the SRS and socket 6 for the memory seats. Since the diagnostic connector was moved from under the hood to in front of the shifter in the console in 1996 for OBD-II, you need a scan tool to do everything from checking for codes to resetting the maintenance light. Maintenance light resetting, by the way, was returned to a push-button method in the very late '90s.

Note that 200 series DLs and GLs have self-diagnostic capability only for fuel and ignition control. All other systems except 1990-93 SRS require a proprietary tool. For '90 to '93 models with air bags, just jump a terminal to ground to get codes out of the system.

Can't Obtain an OBD Code? [Query] I tried obtaining a fuel injection diagnostic code and can't even get 1-1-1. [Response: Chris Herbst] I have run into a LOT of Volvo products with bad diagnostic readout units, usually caused by corrosion. While it is possible that there is no signal TO the diagnostic unit, it is just as likely that either the connection in the terminal, or the connection TO the unit from the EFI computer, is bad. You should try cleaning those connections, and if necessary you can jiggle the connections until you DO get proper readings. I've never had it where I wasn't able to at least read codes and reset the computer, although sometimes it was when I was squeezing the connections into the diagnostic readout unit, or jiggling them around. While your problem could be the ECU, more likely it is corrosion or a bad connection.

ABS Diagnostic Code Retrieval. [Tip from Tom Irwin] To retrieve any ABS diagnostic codes which are stored and are noted by a lit "ABS" lamp, turn the ignition switch on to KPII and leave the engine off.

Put the Diagnostic Link Connector (driver's side strut tower, same as ignition and fuel injection diagnostic unit) probe into DLC Unit A, Position 3. Push button on DLC for >1sec. and capture codes flashing in the red lamp.

To clear codes, place the DLC probe into position 3. Hold DLC button down for >5secs. Release for 3 secs, then press again for >5 secs. This will clear the codes.

The codes are shown in the table below. Note that these are generic; your car may not have two rear wheel sensors and thus the code will not apply. If you cannot pull any codes but the lamp still lights, see Diagnostic Unit Malfunction: Surge Protector Failure below.

On-Board Diagnostic Codes for AW-30-40 Series Automatic Transmissions.

These electronically-controlled transmissions also contain a diagnostic code series that you can access easily from the engine DLC module (the same one as used for the ignition and fuel injection codes.) Note that this Mode 1 procedure for code retrieval works only for OBD-I (pre-1996) 960 cars.

1. Open DLC, (Diagnostic Link Connector) insert Test lead into hole #1.
2. KEY IN position 2, engine NOT running.
3. Push and hold DLC button for >1second, but, 5sec. release, wait for LED to light, then hold button for >5 sec again. And you are cleared.
There is also a self-test mode 3 you can enter which is a two man job. One enters the code through the DLC and the other guy is under the car feeling for each solenoid and other device to activate in sequence. Then, you can run through all the gear positions and modes and the DLC will respond with a code that shows the input was good or not. Good for isolating bad components.

Diagnostic Trouble Code Table for AW 30/40 Series Transmissions: Mode 1
1-1-1 No faults found by onboard diagnostic (OBD) system
1-1-2 Solenoid S1 short-circuit to battery voltage
1-1-3 Transmission control module (TCM) fault
1-1-4 Program selector open-circuit or short-circuit to ground
1-2-1 Solenoid S1 short-circuit to ground or control module fault
1-2-2 Solenoid S1 open-circuit
1-2-3 Solenoid STH short-circuit to battery voltage
1-2-4 Mode selector faulty or short-circuit to ground
1-3-1 Solenoid STH open-circuit, short-circuit to ground, or control module fault
1-3-2 Transmission control module (TCM) fault
1-4-1 Faulty load signal from ignition control module (ICM)
1-4-2 Oil temperature sensor short-circuit to ground
1-4-3 Oil temperature sensor circuit, open circuit
2-1-1 Transmission control module (TCM) fault
2-1-2 Short-circuit to battery voltage in solenoid S2 circuit
2-1-3 Throttle position signal too high
2-2-1 Short-circuit to ground in solenoid S2 circuit or control module fault
2-2-2 Solenoid S2 open-circuit
2-2-3 Throttle position sensor signal too low
2-3-1 Throttle position sensor signal sporadic
2-3-2 Speedometer signal missing
2-3-3 Incorrect speedometer signal
2-3-5 High oil temperature
2-4-5 Break or short-circuit in torque-limiting signal circuit
3-1-1 RPM signal from transmission missing
3-1-2 RPM signal from transmission faulty
3-1-3 FAulty signal from gear position sensor
3-2-1 Shift time too long
3-2-2 Incorrect gear ratio
3-2-3 Lock-up slips or is not engaged
3-3-1 Short-circuit to battery voltage in solenoid SL circuit
3-3-2 Solenoid SL open-circuit or control module fault
3-3-3 Short-circuit to ground in solenoid SL circuit or control module fault

ABS System Diagnostic Information
Mode 1:
(40 km/h=25 mph)
1-1-2 No error code set
1-2-1 Left side front wheel sensor: faulty signal at speed less than 40km/h
1-2-2 Right side front wheel sensor: faulty signal at speed less than 40km/h
1-2-3 Left side rear wheel sensor: faulty signal at speed less than 40km/h
1-2-4 Right side rear wheel sensor: faulty signal at speed less than 40km/h
1-2-5 Signal faulty from at least one wheel sensor for a long period
1-3-5 Control Module (CM) faulty
1-4-1 Faulty pedal sensor: shorted to ground or supply
1-4-2 Faulty stop (brake) lamp switch: open circuit
1-4-3 Control Module (CM) faulty
1-4-4 Brake discs overheated
1-5-1 Left front wheel sensor: open circuit or short-circuit to battery voltage
1-5-2 Right front wheel sensor: open circuit or short-circuit to battery voltage
1-5-5 Rear axle sensor: open circuit or short-circuit to battery voltage
2-1-1 Left front wheel sensor: no signal on moving off
2-1-2 Right front wheel sensor: no signal on moving off
2-1-3 Left rear wheel sensor: no signal on moving off
2-1-4 Right rear wheel sensor: no signal on moving off
2-1-5 Valve relay: open circuit or short-circuit
2-2-1 Left front wheel sensor: ABS operation signal missing
2-2-2 Right front wheel sensor: ABS operation signal missing
2-2-3 Left rear wheel sensor: ABS operation signal missing
2-2-4 Right rear wheel sensor: ABS operation signal missing
2-3-1 Left front wheel sensor: signal missing
2-3-2 Right front wheel sensor: signal missing
2-3-5 Rear axle sensor: signal missing
3-1-1 Left front wheel sensor: open circuit or short-circuit
3-1-2 Right front wheel sensor: open circuit or short-circuit
3-1-3 Left rear wheel sensor: open circuit or short-circuit
3-1-4 Right rear wheel sensor: open circuit or short-circuit
3-2-1 Left front wheel sensor: irregular interference at speeds over 40 km/h
3-2-2 Right front wheel sensor: irregular interference at speeds over 40 km/h
3-2-3 Left rear wheel sensor: irregular interference at speeds over 40 km/h
3-2-4 Right rear wheel sensor: irregular interference at speeds over 40 km/h
4-1-1 Left front wheel inlet valve: open circuit or short circuit
4-1-2 Left front return valve: open circuit or short circuit
4-1-3 Right front wheel inlet valve: open circuit or short circuit
4-1-4 Right front return valve: open circuit or short circuit
4-1-5 Rear valve: open circuit or short circuit
4-2-1 Rear wheel circuit inlet valve: open circuit or short circuit
4-2-2 Rear wheel circuit return valve: open circuit or short circuit
4-2-3 Traction control system (TRACS) valve: open circuit or short circuit
4-2-4 Pressure switch for TRACS: faulty or short circuit
4-4-1 Control Module (CM) faulty
4-4-2 Pump pressure low
4-4-3 Pump motor/relay: electrical or mechanical fault
4-4-4 No power supply to valves in hydraulic unit


Cruise Control Onboard Diagnostic Codes.

[Editor] Later LH2.4 cars employing two diagnostic modules can directly read cruise control codes. Plug the module pigtail from the "A" unit into position two on the "B" unit. The cruise control system for earlier LH2.4 cars without a "B" unit can be connected to the OBD system to read diagnostic codes. To do this, run a wire from the extra pigtail on the cruise control unit connector at the left side under the driver's kick panel to the OBD diagnostic connector in the engine compartment (the pigtail you plug into the various holes.) The system must be tested with the ignition "On" and after roadtesting above 35 km/h (22mph) since the unit does not store codes, only reports them, and erases all codes when the ignition is turned off. The following is a brief excerpt from the OEM manual.
There are two diagnostic modes:


1. Mode 1: Self Diagnosis

Ignition "On" after roadtest, diagnostic wire connected. Press diagnostic button once for one second. Read the code. (If nothing flashes, see No Code.)Check for another code by pressing again for one second. Repeat until the first code is returned. This test returns various error codes from the road test.

Code
Fault
With Ignition & Cruise Selector "On" Check:
1-1-1 No faults detected; speed has exceeded minimum 35 km/h needed for test
1-1-2 Abnormal speed signal * Possible static in speed signal to control
1-2-2 No speed signal, or has not exceeded minimum 35 km/h
* Voltage feed (12V between terminals 10 & 11)
* Ground location (0 ohm between terminal 10 and ground)
* Speed signal
* Wiring in circuit (speedo to control unit; speedo to rear axle)
* With rear wheels raised and one rotating slowly,voltage at terminal 13 should oscillate 12V to +1.5V

2-1-1 Voltage feed or cruise control unit malfunction
* Minimum 10.5 V at terminal 11
2-1-2 Malfunction in the circuit to vacuum pump or regulator
* Test vacuum system first
* 12 V between terminal 2 and ground
* 12 V between terminal 10 and 11
* Ignition Off, selector On: Check wiring for resistance

1. Mode 2: Component Test

Ignition "On", diagnostic wire connected. Start with cruise selector switch "Off" and the transmission in "Drive". Press the diagnostic button twice, each for one second. The LED shoud flash rapidly. Then perform the following tests in the order listed to test each component of the cruise control system. Faults may be pinpointed to the components or circuits noted.

Activated Component
Action
Code
Fault
Brake light switch Depress brake pedal for one second
1-3-2 If no code: brake light circuit Selector ON and OFF, brake and clutch valve Depress brake then clutch pedal for one second
1-1-3 If no code: brake and clutch valve Selector RESUME Press RESUME for one second
1-2-3 If no code: resume button Selector SET Press SET for one second
1-3-1 If no code: set button Start inhibitor switch Shift transmission to NEUTRAL
2-2-3 If no code: start inhibitor switch If code 3-1-1 is reported during any test:
3-1-1 Several simultaneous signals: short in circuits

ECC Climate Unit Diagnostic Codes.

The ECC climate unit in air conditioning-equipped cars can detect certain system faults and display the appropriate diagnostic trouble code by flashing the lamp in the A/C button. If the control module detects one or more faults, the driver is warned by the flashing A/C button. If a fault is major, the lamp will flash continuously while the engine is running; if minor, the lamp will flash for 20 seconds after the engine is started. To read the diagnostic trouble codes, the engine must be running; the blower selector in AUTO setting; the function selector in VENT setting; the temperature switch set to maximum cooling; the recirculation switch pressed in; and the A/C switch released (out). Shine a strong light on the solar sensor in the dash speaker; otherwise, the DTC for the sensor will be displayed even if fault-free. Retrieve the DTCs by pressing the A/C button in and releasing it within 5 seconds. If several DTCs are stored, they will be displayed sequentially. All will be erased when the ignition is turned off. If no faults are set, then "1-1-1" will be displayed. Note that faults may be in the component or in its wiring.

To diagnose cars with ECC but without air conditioning, no trouble light will illlumine; the system will fail. Remove the ECC module from the dash panel, take off the cover plate and press the diagnostic test button twice within 5 seconds. Read the DTCs from the nearby LED lamp, pressing the button after each DTC to read any more codes.

Table of ECC Diagnostic Trouble Codes.

[Fault Classes: A: Serious; M: Minor; I: No warning to driver]

DTC
Fault Component & Description
Fault Class
1-1-1 Fault-free

Ambient temperature sensor (on blower housing):
1-2-1 Short-circuit to ground
1-2-2 Open circuit or short-circuit to 12V

Interior temperature sensor (in roof light):
1-3-1 Short-circuit to ground
1-3-2 Open circuit or short-circuit to 12V

Coolant temperature sensor (in heater):
1-4-1 Short-circuit to ground
1-4-2 Open circuit or short-circuit to 12V

Generator:
1-5-1 D+ signal level in generator

Solar sensor (in speaker grill)
1-6-1 (Note: illuminate this with a lamp to clear code)

Servomotor/potentiometer:
2-1-1 Open circuit or short-circuit to ground
2-1-2 Short-circuit to 12V

Servomotor Drive:
2-1-3 Pin 17 or 18 connected incorrectly to 12V

Servomotor:
2-1-4 Motor activated for too long > 10 seconds
(blocked motor or failure of motor supply)

ECC Control Panel:
2-3-1 Faulty temperature control
Blower Motor:
2-3-3 Starting current too high, motor seizes or turns sluggishly

Power terminal incorrectly connected to 12 V for the solenoids as follows:
2-4-1 Water valve
2-4-2 Bi-level
2-4-3 Vent
2-4-4 Recirculation
2-4-5 Defroster
2-4-6 Floor
2-4-7 Maximum blower relay
2-4-8 Compressor
2-4-9 Blower relay (cars with air conditioning)
2-4-9 Engine cooling fan relay (cars without a/c)

Power Seat Diagnostic Trouble Codes.
[Editor] The power seat system incorporates an On-Board Diagnostic subsystem used for fault tracing and repair. Diagnostic Trouble Mode (DTM) 1 is used to read stored fault codes. DTM 4 is used to calibrate the seat if control modules, motors, potentiometers, drive cables or other components are removed. The OBD systems vary by model and model year: in 740 and many 940 cars, they require a cable connection between the seat connector and the OBD Diagnostic Link Connector (DLC) module in the engine compartment above the left wheel well. 960 and 1994-95 940 cars can read the codes directly by inserting the OBD selector cable into DLC B position 6. Press button once to select DTM 1 and read out the codes. Erase codes by pressing the button for at least five seconds, wait until the LEDs light up, then press again for at least five seconds. After releasing the button, press it again to obtain code "1-1-1", indicating codes have been erased. If you have a problem requiring use of the OBD system, buy the Volvo OEM Service Manual TP 8501201 "Power Seat" for complete diagnostic and repair information, especially if you must re-calibrate the seats. If you can't get a flashing LED, see No Code.

SRS Onboard Diagnostic Codes:

1992+ Cars. The 1992+ 940 and 960 cars have an onboard diagnostic system for the Supplemental Restraint System that both monitors the system and stores any fault codes for later diagnosis. Faults can occur in components such as airbags, seat belt tensioners, and the sensor unit or in their associated wiring circuits. A fault is indicated by the SRS lamp in the instrument panel, which remains "on" until the fault has been remedied and the OBD system cleared.

A. To read faults, refer to the OBD diagnostic output boxes on the front of the driver's side strut tower. You will find two, labelled "A" and "B".

1. Remove the selector lead from the side of "A" and insert it into terminal 5 of output box "B".
2. Turn the ignition "on" to key position II.
3. Wait about ten seconds.
4. Press the button on box "B". Keep it pressed for about 1 second.
5. Read off the LED flashes. Codes have three digits: A-B-C. If code 1-1-1 is read, there are no stored fault codes. If a code other than 1-1-1 is obtained, write it down and press the button again to see if there are more. When the first code recurs, all codes have been read. If you can't obtain any flashing light, see No Codes.

Code Fault
1-1-1 OK: No faults detected in the OBD system
1-1-2 Internal fault in the sensor unit
1-2-7 SRS lamp, short circuit or break in circuit
2-1-1 Steering wheel module, short circuit in wiring
2-1-2 Steering wheel module, break in wiring
2-1-3 Steering wheel module, short circuit to ground
2-1-4 Steering wheel module, short circuit to +12V
2-2-1 Passenger module, short circuit in wiring
2-2-2 Passenger module, break in wiring
2-2-3 Passenger module, short circuit to ground
2-2-4 Passenger module, short circuit to +12V
2-3-1 Seat belt tensioner left, short circuit in wiring
2-3-2 Seat belt tensioner left, break in wiring
2-3-3 Seat belt tensioner left, short circuit to ground
2-3-4 Seat belt tensioner left, short circuit to +12V
2-4-1 Seat belt tensioner right, short circuit in wiring
2-4-2 Seat belt tensioner right, break in wiring
2-4-3 Seat belt tensioner right, short circuit to ground
2-4-4 Seat belt tensioner right, short circuit to +12V
No code SRS lamp in the instrument cluster does not light
No code Fault in diagnostic output

B. To clear fault codes other than 1-1-2 (indicating a crash sensor fault, which must not be cleared but rather returned to the dealer):

1. Remove the selector lead from the side of "A" and insert it into terminal 5 of output box "B".
2. Turn the ignition "on" to key position II.
3. Press the button on box "B". Keep it pressed for at least 5 seconds.
4. Release the button. The LED lights.
5. Press the button again when the LED lights and keep it pressed for at least 5 seconds.
6. The codes are now cleared.

To check whether codes are cleared, repeat procedure A above. If codes remain, then the fault persists and must be repaired.



Fuel Injection and Ignition Diagnostic Procedures in Bosch LH-Jetronic 2.4+, Regina, and EZK 116/REX 1.

The following section describes the onboard diagnostic codes for the Bosch LH2.4 and Regina fuel injection and EZK 116/Rex1 ignition systems used on later 1988+ 2XX, 7XX, and 9XX Volvo cars. If you have the Bosch LH2.2 or earlier systems, you do NOT have OBD capabilities and will have to diagnose sensor and performance problems using traditional manual techniques.
The later fuel injection and ignition systems incorporate a built-in diagnostic subsystem that is able to test various sensors and fuel injection or ignition components and report the results. This diagnostic system is located behind the driver's side strut tower in the engine compartment with a readout box with several functional modes. 940 cars have two boxes: "A" and "B"; the former is used for engine diagnostics and ABS; the latter for SRS and cruise control. If fault codes related to the emission system are registered, the "Check Engine" lamp on the instrument panel is lit. The test cable is mounted to the side of A.
To operate the diagnostic system, open the A box cover and place the test cable mounted on the side of the box into either socket 2 for LH 2.4/Motronic 1.8/Regina fuel injection diagnostics and component or sensor tests or socket 6 for EZK 116 ignition or California EGR diagnostics. To operate the system:

1. Diagnostic Test Mode 1: Fault Code Retrieval

• Place the cable into socket 2 (LH2.4/Regina/Motronic 1.8fuel injection test) or 6 (EZK116 or REX1 ignition test) as above
• Turn the ignition ON to KPII without starting the engine
• Select Mode 1 by pressing the button once and holding for more than 1 second but less than 3 seconds
• The LED lamp will flash in successive series of three digits followed by a three-second pause. If there are no fault codes stored, it will flash 1-1-1 indicating the fuel injection system is operating correctly. (If nothing flashes, see No Code.)
• Count the successive flashes and record the fault code.
• Press the button again.
• Record the fault code. If it is the same as the previous one, then no additional codes are stored. Repeat until all the codes stored are retrieved (maximum of three.)
• Refer to Table 1 for the interpretation of fault codes from the LH2.4 Fuel injection System and Table 2 for codes from the EZK 116 Ignition System.
• Move the cable into socket 6 (for ignition codes from EZK116 or REX1) or socket 2 (for fuel injection codes from LH2.4/Regina) and repeat the above.




2. Erasing Fault Codes.

After you have retrieved all the Fault Codes in step 1 above, you should erase the system memory.
•
• Repeat step 1 above and read the fault codes again
• Press and hold the button for more than five seconds, then release it.
• When the LED lights, press the button again for more than five seconds and release. If the LED goes off, then the memory is cleared.
• To test that memory is cleared, press the button again for >1 second and 1 and 1 and 1 and 1 and <3 seconds before pressing again)
• The diagnostic unit then tests the EGR system controller which you can hear or feel.
• Exit by switching off the ignition.


Table 1: Bosch LH2.4 and Motronic 1.8 Fuel Injection Fault Codes (* denotes Check Engine lamp goes on). Where the Motronic 1.8 codes are different from LH 2.4, the differences are shown in blue italic. Read these from socket 2. See Table 3 below for Regina fuel injection codes.

Fault Codes
LH 2.4 Fault Condition
LH 2.4 Causes of Fault
LH 2.4 Symptoms
Motronic 1.8 Fault Condition Motronic 1.8 Causes of Fault
1-1-1
No faults N/a N/a Same Same
1-1-2
Fault in FI control unit FI module fault None Same Same
1-1-3*
Fuel trim (lambda control) too lean or rich Mixture incorrect; O2S wiring fault High fuel consumption Fault in Injector 1,2,4 Fuel Injector
1-1-5 Not applicable NA NA Fault in Injector 3,5,6 Fuel Injector
1-2-1*
Faulty signal to/from Air Mass Meter Wiring fault to or in AMM Various driving problems; fuel consumption Same Same
1-2-3*
Signal missing to/from coolant temp. sensor Wiring fault to or in ECT sensor Difficult to start engine when cold Same Same
1-3-1
Ignition system RPM signal missing on starting Wiring fault or RPM sensor bad Engine will not start Same Same
1-3-2
Battery voltage too low/high Poor battery or charging system No faults evident Same Same
1-3-3
Throttle switch idle setting faulty or grounding fault TPS failure or maladjusted Above-normal idle speed Same Same
1-4-3 Not applicable NA NA Front knock sensor signal missing or faulty Front Knock sensor
2-1-2*
Signal missing/faulty from oxygen sensor Wiring fault to heated O2S sensor High fuel consumption, driving problems Same Same
2-1-3
Throttle switch full load setting faulty or grounding short Wiring fault to TPS or TPS failure No faults evident Same Same
2-1-4 Not applicable NA NA Ignition system RPM signal missing sporadically Wiring fault or RPM sensor
2-2-1*
Fuel trim (lambda control) too lean at part load Lean; air leak; low fuel pressure; bad AMM Engine stops when starting from cold; high fuel use Same Same
2-2-3
Signal missing to/from idle air control valve Circuit fault to IAC or faulty IAC valve Engine difficult to start; low idle speed Same Same
2-3-1*
Fuel trim (lambda control) too lean or too rich at part load }If too lean: air leaks, low fuel pressure, bad sensor }Engine stops when starting from cold; high fuel use or Fuel trim (lambda control) too rich at part load Oxygen sensor
2-3-2*
Fuel trim (lambda control) too lean or too rich at idle }If too rich: high fuel press., leaking injector } various driving problems Fuel trim (lambda control) too lean at idle Oxygen sensor
2-3-3 Not applicable NA NA Idle control outside range Idle speed control
2-4-1 Not applicable NA NA EGR system flow too low EGR vacuum booster
2-4-3 Not applicable NA NA TPS throttle switch signal absent or faulty Throttle position switch (TPS)
3-1-1
Signal missing from speedometer Speedo wiring or instrument cluster wiring faulty Idling problems Same Same
3-1-2
Signal missing for knock-related fuel enrichment Wiring break between EZK terminal 4 and FI #28 No faults evident Same Same
3-1-4 Not applicable NA NA CMP camshaft sensor signal absent or faulty Camshaft position sensor (CMP)
3-2-1
Cold-start injector signal shorted or missing Wiring break to cold-start injector or fault in injector Cold-start problems Same Same
3-2-2 Air Mass Meter wire burn-off signal absent or faulty Wiring break between FI terminal 8 and AMM #4 Various driving problems due to dirty AMM wire Same Same
3-4-4 EGR temperature signal absent or faulty Wiring break or fault in sensor B 204 FT/GT engines only Same Same
4-1-3 Not applicable NA NA EGR temperature sensor signal missing or faulty EFG temperature sensor
4-3-3 Not applicable NA NA Rear knock sensor signal missing or faulty Rear Knock sensor










Table 2: EZK 116 and Regina Rex Ignition Fault Codes (* denotes Check Engine lamp goes on)
(REX 1 ignition system codes are shown in italic.) Read these from socket 6.
Fault Codes
Fault Condition
Causes of Fault
Symptoms

1-1-1
No fault detected N/a N/a
1-4-2*
Control module fault EZK ignition control module faulty Engine runs in limp-home mode
1-4-3*
Knock sensor signal absent or faulty Faulty wiring to/from/in the knock sensor Poor acceleration, low power, high fuel cons.
1-4-4*
No load signal from fuel injection system Faulty wiring from LH to EZK; bad LH module Engine lacks power; stalls; doesn't start or is jerky
1-5-4*
EGR system flow too high Faulty EGR valve or controller, wiring; engine thermostat Engine idles unevenly
2-1-4
RPM sensor signal absent intermittently Faulty RPM sensor, wiring or incorrect installation Engine will not start; runs rough; overheats
2-2-4
Engine coolant temp (ECT) sensor signal absent or faulty Faulty wiring or ECT sensor No fault symptoms evident
2-3-4
Throttle Position Switch (TPS) idle signal faulty Faulty wiring or TPS; TPS adjusted incorrectly Poor hot starting; poor idling; limp-home operation
2-4-1*
EGR system flow too low Faulty wiring, EGR, EGR vacuum or controller; EGR temp sensor Poor idling
4-1-3*
EGR temperature sensor signal faulty or absent Faulty EGR temp sensor or wiring No fault symptoms evident
3-3-4
Throttle Position Switch (TPS) in idle position (REX 1 only) Faulty wiring or TPS; TPS adjusted incorrectly


Table 3: Regina Fuel Injection Fault Codes. Read these from socket 2. Fault Codes Fault Condition Source of Fault
1-1-1 No faults
1-1-2 Fault in control unit FI control unit
1-1-3 Fault in injector Fuel injector
1-2-1 Signal missing or faulty to/from pressure sensor MAP Pressure sensor
1-2-2 Signal missing or faulty to/from air temperature sensor Air temperature sensor
1-2-3 Signal missing or faulty to/from coolant temperature sensor, possible grounding short ECT Coolant temperature sensor
1-3-2 Battery voltage too high/low Check battery and charging system
1-3-3 Throttle switch: idle setting faulty, possible grounding short TPS Throttle switch
2-1-2 Oxygen sensor signal missing or faulty Oxygen sensor
2-1-3 Throttle switch: full load setting faulty; possible grounding short TPS Throttle switch
2-2-1 Oxygen sensor not operating Oxygen sensor or intake air leak
2-2-2 Fault in fuel injection relay Fuel injection relay
2-2-3 Signal missing to/from idle valve IAC Idle air control valve
2-3-1 Self-adjusting oxygen sensor not operating Intake air or fuel system
2-3-2 Self-adjusting oxygen sensor not operating Intake air or fuel system
2-3-3 Idle valve closed IAC Idle air control valve
2-4-1 EGR system malfunction (California cars) EGR vacuum booster
3-1-1 Signal missing from speedometer Speedometer signal
3-2-1 Signal missing to/from cold start valve Radio suppression relay
4-1-3 EGR temperature sensor circuit (California cars) EGR temperature sensor

[Delta66]

Thanks, is it OK I keep it for a while and experiment?

I am thinking that the I, F, A, C settings change what the sensor is asking for.

[psl]

By all means, no problem

[Delta66]

Thanks. The plan is to get all the codes then clear them all. Then when the ABS light comes on I will do another reading. Hopefully that will be the only code to appear. I will repeat to check and confirm.

[bob12]

It should be noted that the OBD l 'black box' (at least for 700/900 Series with LH 2.4) whilst on the left hand side strength strut between the suspension trumpet and the back bulkhead is not on the driver's side for UK models.

[Delta66]

The codes were;

Position I - 1.1.1 so nothing.

Position F - 3.2.2 which on the sheet provided with the box is the MAF sensor, which I knew about as it was replaced.

Position A - 1.5.2 which is not on the sheet, but is on the list above under ABS diagnostic as "Right front wheel sensor : open circuit or short-circuit to battery voltage".

Position A - 2.3.2 which is on the sheet provided is "Lambda control too lean or too rich at idle". It is also on the list above as "Speedometer signal missing" or ABS "Right front wheel sensor: signal missing" or "Seat belt tensioner left, break in wiring" or "Self-adjusting oxygen sensor not operating Intake air or fuel system"

The Lambda light did come on recently, after it passed the MOT but the mechanic found a leak in the manifold gasket which he replaced. The mechanic described the sensor as possibly becoming confused and after a reset it has not come on again, so it could be from that. The speedo is fine. The ABS right sensor has already kicked up a fault code, so it could be that. As for the seat belt tensioner and oxygen sensor, I have not got a clue, there is nothing to suggest a fault from any dash warning lights.

Position C - no codes.

I have reset all to 1.1.1 and will see what codes reappear. It looks certain the right ABS sensor is at fault. I presume right means driver's/off side.