Faulty Signal

ECM-33X0 IGNITION COIL X
FAULTY SIGNAL

Checking status



- Start the engine and let it idle. Engine should run evenly

Does the engine run on all cylinders?
Yes - Faulty Signal - Intermittent Fault
No - Continue below.


Faulty signal. Permanent fault
Checking connector and wiring



Check ignition coil connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Permanent Fault

Check signal cable between ignition coil # 1 and engine control module (ECM):
# A31 (ECM-3300)
# A30 (ECM-3310)
# A29 (ECM-3320)
# A51 (ECM-3330)
# A50 (ECM-3340)
for a short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Permanent Fault, a short-circuit to ground according to [1][2]Checking Wiring and Terminals. Permanent Fault, and an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information:
- For connection of engine control module (ECM) breakout box, Connecting the Breakout Box (ECM)
- To access/replace the ignition coil, Ignition Coils, Replacing
- To access/replace the engine control module (ECM), Engine Control Module (ECM), Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall connectors, components etc.
- Start the engine and let it idle. Engine should idle evenly.

Does the engine run on all cylinders?
Yes - Testing Complete.
No - Continue below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.