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Old 12-29-2008, 10:31 AM   #1
catena
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Default 2002 SL2 Cam Position Sensor Error

I have a 2002 SL2 with the 1.9 dohc motor. It has about 117K miles, lives in a northern Ohio climate, and it ran perfectly until recently...

It keeps throwing the codes P0340 and P0341 which are "no signal to PCM from camshaft sensor bank 1" and "incorrect signal to PCM from camshaft sensor bank 1", respectively.

One cold morning, I started the car and discovered the Service Engine Soon light did not turn off as it usually does. A brief drive revealed an intermittent misfire. After pulling the P0340 and P0341 codes at Autozone, I returned home and parked the car. Later that day, my father drove the car briefly and the SES light did not come on for him, and the car ran fine. This fixed the code only briefly: I drove the car the next day and within five minutes of startup I had to stop at a red light. A brief but noticeable misfire kicked the Service Engine Soon light back on as I waited for the light to turn green. It misfired once more on the way to the auto parts store to learn that it was giving the same P0340 and P0341 codes. I returned home, visited these forums and learned that the car does not have a cam position sensor per se, and that a tuneup usually fixes the problem.

Effort 1:
I tuned up the car using non-platinum plugs (.040 gap) and some Autocraft Professional wires. This fixed the code briefly, but then the SES light returned. I disconnected the battery again for several minutes to clear the code and had one successful test drive. However, after I parked it for the night and started it in the morning (it cranked very slowly and did not want to start), the Service Engine Soon light remained illuminated after startup and the intermittent misfire was still present.

Effort 2:
The difficult start sent me back to the auto parts store. A battery test revealed that my battery was bad. A new battery was installed, and the SES light was off. This lasted for one ride but again after parking and starting it the next day, the Service Engine Soon light stayed illuminated after startup and the car still misfired intermittently.

Effort 3:
The next new parts were two brand new OEM coil packs (not including the module). Disconnection of the battery and installation of these parts fixed the SES light and the misfire problem for two full days, but when I started it this morning the Service Engine Soon light is on again. I have not felt any misfires, but I have only driven it briefly.

I'm quite frustrated and out of ideas at this point, so I welcome any suggestions. Thanks everyone!

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