Error Code 42 EC31 Electronic Spark Timing failure?

[milehighGN]

What does this error code mean? What do i have to fix?

 

[milehighGN]

Anyone experience this before? Its either the ECM or the C3I ignition coil module . Isn't the ignition coil module the coil pack?

 

[Epitome]

The module is what the coil pack is controlled by and is mounted to, it's not the coil pack.

 

[milehighGN]

Okay. Do you know where i can get a new module?

 

[Lee_Burough]

I have a spare you could use to confirm your malfunction

MALF codes are here

From GNTTYPE.org...."Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system.

During cranking, the timing is controlled by the ignition module while the ECM monitors the engine speed. When the engine speed exceeds 400 RPM, the ECM sends a BYPASS signal to the ignition module which switches the timing to ECM control. The ECM calculates what the timing should be then "tells" the ignition module via the EST circuit.

An open or ground in the EST circuit will stall the engine and set a Code 42. The engine can be re-started but it will run on ignition module timing.

The conditions for setting this code are:

System in BYPASS mode but the ignition module is still controlling timing

- or -
Engine speed > 600 RPM with no EST pulses (ECM controlled timing) going to the ignition module for 200 msec.



Typical causes for this code include:

1) BYPASS line is open or grounded
2) EST line is open or grounded
3) PROM or CALPACK not seated properly in the ECM
4) Poor connections between ignition module and ECM
5) Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise)
6) Faulty or incorrect ignition module
7) Faulty ECM"

 

[milehighGN]

Thanks again Lee! I'd love to borrow the ign.module to test this out. I put the new fuel pump in my car, and was excited to get it going well, but now it just runs like crap.

 

[Lee_Burough]

You have a PM

Call me.