Faulty Signal - Intermittent Fault

ECM-33X0 IGNITION COIL X
FAULTY SIGNAL - INTERMITTENT FAULT

Checking cables and connectors



Check ignition Coil connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Intermittent Faults

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 an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults, an intermittent short-circuit to ground according to [1][2]Checking Wiring and Terminals. Intermittent Faults, and an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

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


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.