V70: Engine Camshaft sensor

[narva]

I had an unusual engine shut down while driving. So far 3 times already. Engine just stops running with no check engine lights. I need to stop my car, then power on and the engine is running again fine.

VIDA diagnosed the following DTCs on my D3 engine:

ECM-P034000 Camshaft position sensor A circuit
ECM-P034200 Camshaft position sensor A circuit low
TCM-P074468 Torque converter clutch solenoid circuit intermittent - algorithm based failures


Some history:

Around 1500 km ago I replaced toothbelt, water pump, aux belt etc. I had trouble when getting water pump out, it was extremely tight, I accidentally winded camshaft pulley couple of teeth. Previously I had marked both crankshaft pulley and camshaft pulley. So, I winded camshaft pulley back to its original position.

Is it faulty camshaft sensor ? Or did my activity with moving camshaft pulley back and worth cause issues now 1500 km later ?

[narva]

Engine shutting down is related to temperature, I started to experience it only when driving on highway for a long distance. For example, I need to stop the car then go for another ride, and then the engine stops running when gearbox has 3rd shift on.

[adsk]

I experienced engine shutdowns like this when my car was only 2 months old: camshaft sensor was replaced under warranty..a telltale sign is sometimes when the engine is running the Rev counter is at zero

[pierremcalpine]

Interesting...I had something similar happen while on vacation last summer also after having done some long distances often at higher speeds, on hot days, with lots of grade changes on hwy, with 4 bikes on the roof i.e. engine was working pretty hard. See link below for details:
http://www.volvoforums.org.uk/showthread.php?t=235317

I did not get the first two errors that you got but I did get the third (the TCM one). I did a bit of research and it sounds like that alone will cause the car to turn off. I have since done a full flush of the transmission fluid and it has not happened again. In my case, if it does, it will be time for a new solenoid.

Keep us posted.

[narva]

I am back from my vacation, I drove 5000 km in total, the issue happened only when the air temperature was more than 25 degrees. I had 4 incidents, all on highway after having a small lunch brake at gas station.

I unplugged the camshaft sensor to see if I can reproduce similar situation at home. Engine didn't fire as expected, it was like "out of fuel" situation -- but eventually it started and kept running. It seems that camshaft sensor itself is functioning. Any idea how to test it properly ?

I had transmission oil changed before this trip, so dirty oil is ruled out.

But I do started to experience some engine vibration at about 1000 RPM. It feels like "engine is unbalanced". I did read cylinder speeds, can someone confirm this is Ok ? VIDA shows that cylinder 5 has 711 r/min and cylinder 2 has 723 r/min.

[bobsy852]

I can't speak much for the Volvo but when the camshaft sensor failed in my old BMW it did all sorts of weird stuff. It would cut out when I came to a standstill, it would struggle under heavy loading, misfire a bit, take a bit longer to start.

Diagnostics diagnosed that for me, and it's been flagged up in your VIDA results so that's where I'd start. Probably not a cheap sensor to replace but sometimes you have to start somewhere with these things guessing a little bit

[narva]

There may be 2 sensors involved: camshaft and crankshaft sensor. I hear that people have changed crankshaft sensor in case of engine cut out.

Camshaft sensor replacement is an easy job, crankshaft sensor replacement is tough one (need to get EGR removed probably).

VADIS even doesn't mention crankshaft sensor (RPM sensor) in DTC details when error code was related to ECM-P034***. So, I would start with replacing camshaft sensor. It is BOSCH [code 0 232 103 063] product and a lot cheaper than Volvo original [8658726] which is also BOSCH.

[narva]

The issue is back. Did buy a new camshaft sensor, new sensor didn't help.

Any ideas ??? VIDA mentions faulty MassAir flow sensor in ECM-P034000 troubleshooting details. This doesn't seem to be relevant because, does it ?

And it appears always related to the following key factors:

1. Air temperature >= 25 degrees
2. Engine needs to be warm, then it needs to be stopped, then go for a ride -- usually happens at intersection after starting to accelerate and is very annoying!

ECM-P034000 (frozen values)

MECU supply voltage 12.75 V
Outdoor temperature 26 °C
Power Mode Running
Calculated load value 74.90 %
Engine coolant temperature 75 °C
Intake manifold absolute pressure sensor 1230 hPa
Engine Speed 1507 rpm
Vehicle speed (via CAN) 11 km/h
Intake air temperature (MAF) 33 °C
Air Flow Rate from Mass Air Flow Sensor 81.86 kg/h
Absolute Throttle Position 89.80 %
Time since engine start 148 s
Fuel pressure 1098100 hPa
EGR valve, commanded position 19.61 %
EGR adaption -1.56 %
Temperature Sensor, Particulate Filter 172.8 °C
Control module voltage 13.16 V
Outdoor temperature 26 °C
Accelerator pedal position (via CAN) 18.43 %
Accelerator pedal position, PWM 17.65 %


ECM-P034200 (frozen values)

MECU supply voltage 14 V
Outdoor temperature 26 °C
Power Mode Running
Calculated load value 83.92 %
Engine coolant temperature 76 °C
Intake manifold absolute pressure sensor 1620 hPa
Engine Speed 1381 rpm
Vehicle speed (via CAN) 46 km/h
Intake air temperature (MAF) 32 °C
Air Flow Rate from Mass Air Flow Sensor 85.28 kg/h
Absolute Throttle Position 89.41 %
Time since engine start 161 s
Fuel pressure 1190300 hPa
EGR valve, commanded position 18.04 %
EGR adaption -6.25 %
Temperature Sensor, Particulate Filter 191.2 °C
Control module voltage 14.54 V
Outdoor temperature 26 °C
Accelerator pedal position (via CAN) 19.61 %
Accelerator pedal position, PWM 18.82 %

[narva]

Could it be that my camshaft pulley is 1 tooth off ? What shall be the symptoms then ?

Interesting article about camshaft timing: http://www.tiepie-automotive.com/en/...ome_Volvo_XC70