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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars

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Old Nov 9th, 2018, 19:24   #11
Laird Scooby
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Quote:
Originally Posted by Pete940 View Post
The crank sensor makes its own voltage. Not sure where the 5v is coming from. One of the three pins just goes to a shielding wire. It's difficult to measure the voltage that the crank sensor creates whilst cranking in my experience. Easier to measure pin 5 (i think) of the plug going to the ignition amplifier. This is the trigger signal from the Ezk.
Some of the later sensors have a +5V supply, the third pin is then the signal and the shield is 0V. Can't get the diagrams up on t'internet at the moment, just times out.
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Old Nov 9th, 2018, 19:29   #12
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You have a 5V feed and an earth on the CPS? Why are you expecting to see a 12V feed as well? The third pin is the output.
Was just following the non start flow chart from here and its a b230ft and says i should expect 12v on the red bire 5v on the blue wire.

The fuel pump is being powere i have the cap off the control relay and can here it pump and can force it to pump through that relay.


I have no idea if it is just being immobilised not sure how the system works whether its fuel or spark related.

I may try and swap out the power stage and see if that will give me the spark back
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Old Nov 9th, 2018, 20:36   #13
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Fit a new CPS.
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Old Nov 9th, 2018, 21:00   #14
mocambique-amazone
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OK, once again ;-)

Step1: do you have the right key to try to start. The anti-theft-device will be switched off only by the right key
Step2:the fuel pump relay : it is a two step relay. First step is fuel pump, only one in tank pump at a 1997 940, the second is to power the ECU. You will need a y- bridge to test if this relay is the fault.
Step 3: CPS
Step 4: fuel pump is gone (not enough pressure) you will be not interested in step 4, because of no spark.

Forget the RSR relay. Till now I never ever had a faulty RSR at a 940 1992+

5V where? I didn't read carefully or didn't understand.

No big miracles with a 940. My 744 even did start with fuel 8 years old ( ok did smell terrific, still did run)
Good luck, Kay
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Old Nov 10th, 2018, 07:45   #15
Sam1275
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Yes the key is correct

Yes both em1 and em2 sides of the relay are working correctly.

I have 3 bar of fuel pressure

I will have to try and get a crank sensor today
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Old Nov 10th, 2018, 10:01   #16
mocambique-amazone
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Well done :-)

Yes, it will be step 5 if there are no injectors and spark plug working.

If the injectors do work and still no spark you will have to renew the ignition module. Don't forget the heat sink paste.

Good luck, I prefer the 1995+ 940 is. Astonishing reliable and good cars .
Have a nice day, Kay
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Old Nov 14th, 2018, 12:05   #17
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Sam, did you got the Volvo run properly again?

Good luck, Kay
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