Engine not firing

Tiny
SETHMASTRO
  • MEMBER
  • 2002 PONTIAC GRAND AM
  • 3.4L
  • V6
  • FWD
  • AUTOMATIC
  • 132,000 MILES
I have a 2002 Grand Am SE1 with the 3.4 and auto trans with 131k miles. I bought the car with a crank no start problem 2 weeks ago. I verified that it had spark and fule pressure (55-60psi) After some time cycling the key, I was able to drive the car and it ran and shifted great. Armed with the advice of a friend who is a retired GM tech, I replace the ignition module under the coil and the CNS problem seemed to have been fixed. Today the car went back to having the same CNS problem (good spark, good fule pressure) It seems that I am not getting the injectors to fire. I returned and replaced the ignition module, wouldn't start. Then I replaced the cam and 7x crank positioning sensors. The car then started and ran for about 2 min and then shut off as I turned into my drive way and will not restart. I checked the continuity of the wires between the CKS and the ICM while jiggling the wire and found no shorts. I also checked reference voltage going to the cam sensor and that looked to be within spec. Everything seems to point to a problem with the Passlock system but I do not have the "security" light glowing on my dash. While the car is running it runs perfect, I also have no check engine lights or any codes that I can pull with my cheap code reader.
Saturday, September 19th, 2015 AT 9:31 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Hello,

It sounds like the PCM has gone bad which there will be no codes for these are the instructions for replacing it in the diagrams below. Please give your VIN number to the rebuilder so they can send one pre-programmed.

The replacement powertrain control module (PCM) must be reprogrammed and the crankshaft position system variation learn procedure must be performed:
Latest Techline information on PCM re-programming
CKP System Variation Learn Procedure
Inspection/Maintenance (I/M) Complete System Set Procedure
Programming Theft Deterrent System Components in Theft Deterrent Systems

Check out the diagrams (Below). Please let us know what happens.
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Thursday, July 30th, 2020 AT 2:11 PM

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