1999 Chevy Tahoe P01340 CAM sensor malfunction!

BROOKLYNJIM

MEMBER
1999 CHEVROLET TAHOE
V8
4WD
AUTOMATIC
121,912 MILES

Well. After 3 cam sensors (inside dist), 3rd being dealer, going thru ALL the wiring, replacing the crank sensor, re-indexing the distributor, im still getting the CIL and the code.

this has been an ongoing thing for over a year now, ive never had an issue with starting, always starts right up in any weather,

i can erase the CIL, the truck will start and restart a few times before the code and CIL comes back.

any ideas guys?

i even swapped in a used ECM, same make/model and options codes, to elliminate that possibility, yah, that was fun, reprogramming the passlock!

5 Replies

RASMATAZ

EXPERT

Hi BrooklynJim, Welcome to 2carpros and TY for the donation

P0340 Camshaft Position Sensor Circuit Malfunction

P0340 could mean one or more of the following has happened:

"� a wire or connector in the circuit could be grounded/shorted/broken
"� the camshaft position sensor may have failed
"� the PCM may have failed
"� there exists an open circuit
"� the crankshaft position sensor may have failed
Possible Solutions With a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

"� Visually inspect all the wiring and connectors in the circuit
"� Check for continuity in the circuit wiring
"� Check the operation (voltage) of the camshaft position sensor
"� Replace the camshaft position sensor as required
"� Check the crankshaft position circuit as well
"� Replace circuit wiring and/or connectors as required
"� Diagnose/replace the PCM as required

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Tuesday, October 12th, 2010 AT 7:09 PM

BROOKLYNJIM

MEMBER

� � � � � � Visually inspect all the wiring and connectors in the circuit. DONE, CHECKED OUT GOOD, BY MYSELF AND THE DEALER

� � � � � � Check for continuity in the circuit wiring. CAM SENSOR WIRING WAS CHECKED BETWEEN SENSOR PLUG AT DIST, AND ECM, GOOD

� � � � � � Check the operation (voltage) of the camshaft position sensor, CHECKED, BOTH PREVIOUS WERE WITHIN SPEC BUT REPLACED ANYWAY WITH A DEALER SUPPLIED UNIT

� � � � � � Replace the camshaft position sensor as required
REPLACED 3 TIMES, ON 3RD NOW

� � � � � � Check the crankshaft position circuit as well. CHECKED, RESISTANCE WITHIN SPEC, HARNESS ALSO CHECKED, ALL GOOD

� � � � � � Replace circuit wiring and/or connectors as required. NOT DONE YET (COULD IT BE?) AND THE DEALER DIDNT CHANGE?

� � � � � � Diagnose/replace the PCM as required. REPLACED WITH A USED ECM FROM ANOTHER SAME YEAR/MAKE/MODEL AND EVEN RPO CODE TAHOE, SAME ISSUE

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Tuesday, October 12th, 2010 AT 7:19 PM

RASMATAZ

EXPERT

The sensor is good 3rd one to include the CPS voltage/wiring good to the computer and a used PCM-my last resort is flash the PCM and see what happens-Don't work this is as far as I can take you I'm sorry

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Tuesday, October 12th, 2010 AT 7:31 PM

BROOKLYNJIM