I have a 90 jeep wrangler that I am installing an 03 5.3 4L60E, I have a Nelson Performance ECM, and it is setting code PO342, I have traced the problem to the fact that I do not have a 12 Volt reference signal from the ECM, the red wire from the sensor goes to pin 39 on the ECM connector and it is getting a ground voltage instead of 12 volts, My question is can I find a 12 reference on a different pin , or do i have to send the ECM back for repair, thank you
Last edited by oldcarstulsa; 01-13-2009 at 06:15 PM.
1987 jeep wrangler, 1999 LS 1, 4l60 231j transfercase, dana 30 frontend ford 8.8 rearend 3:73 gear ratio. sandersons shortie headers, 2.25 inch exhaust into 3 inch flowmaster muffler.
342 sounds like (from memory) a CKP or CMP DTC. What's the title...or I can look it up some time when I have nothing to do...?
Also, edit your post and change the "O" to a zero in P0342 so it can be searched later...
P0342 is a Camshaft Position Sensor Low Circuit Input.
Be sure the pcm terminal isn't bent.
If you have a spare sensor, replace it, any new 99-06 Gm truck will do fine for a donor.
Next, verify the terminals on the cam sensor connector are intact.
Then, please do this don't assume, ohm out from the cam terminals to the pcm cam terminals.
If all this doesn't fix it, it's possible the pcm is bad.
let us know,
allen
Nelson Performance
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You need the 12V from that specific PCM pin for sure.
Do as Allen suggested. Unplug the PCM and the sensor. Use a meter to check resistance (Ohms) of the red wire end to end. Should be 1 Ohm or less in most cases. If it checks out OK, reconnect the PCM, turn on the ignition, and use a test light (or meter set to DC voltage) and check the red wire at the CMP connector. Should be 12V. If it's not, connect the test light to battery positive and probe the red wire. If it lights, unplug the PCM and recheck. If it still lights, the red wire is grounded somewhere (squashed between the trans and engine block?). If it goes out, get with Allen again on a possible PCM.
If the cam has been swapped it's possible the sensor was damaged.
i did all the above things, complete removed the pin out of the connector, then checked the connector, it was a ground not 12 volts, that was what i said in my first post, that i had did all of the steps, i even installed a nother pcm that i have and it all worked fine, had 12 volts on that terminal, it is a bad pin in the pcm, somehow it has ground instead of 12 volts,
1987 jeep wrangler, 1999 LS 1, 4l60 231j transfercase, dana 30 frontend ford 8.8 rearend 3:73 gear ratio. sandersons shortie headers, 2.25 inch exhaust into 3 inch flowmaster muffler.
got with Allen about this problem, It is a bad PCM, he is shippping out a new one, that is very good service, appreciate the help on here thank you all
1987 jeep wrangler, 1999 LS 1, 4l60 231j transfercase, dana 30 frontend ford 8.8 rearend 3:73 gear ratio. sandersons shortie headers, 2.25 inch exhaust into 3 inch flowmaster muffler.
got my replacement pcm today all is good, I want to thank Nelson Performance for the fast service, thank you
1987 jeep wrangler, 1999 LS 1, 4l60 231j transfercase, dana 30 frontend ford 8.8 rearend 3:73 gear ratio. sandersons shortie headers, 2.25 inch exhaust into 3 inch flowmaster muffler.
Originally Posted by farmtruc
Oh! I never thought that code would be on the camshaft sensors. Well, my brother was having some difficulties when he encountered this code while hooking up some Nelson Performance. I'm gonna let my brother read this steps you mentioned so that he could already clear the code and fix this problem. Thanks for the tips guys. It would really come in handy.
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