Signal Missing - Intermittent Fault

ECM-33X0 IGNITION COIL CYLINDER X, SIGNAL
SIGNAL MISSING - INTERMITTENT FAULT

Checking cables and connectors



Check ignition coil connector for contact resistance and oxidation according to Checking Wiring and Terminals and loose connections according to Checking Wiring and Terminals

Check signal cable between ignition coil #1 and control module:
- #A31 (#A31) (ECM 3300)
- #A30 (#A30) (ECM 3310)
- #A50 (#A50) (ECM 3320)
- #A52 (#A52) (ECM 3330)
- #A51 (#A51) (ECM 3340)
and power supply between system relay #3 and ignition coil #4 for an intermittent open-circuit according to Checking Wiring and Terminals

Other information
- Connecting the breakout box/accessing the control module Connecting the Breakout Box (ECM)
- To access/replace the ignition coil, Ignition Coils, Replacing
- For information about signals, see Diagnostic Parameters and Pinout Values. Pinout Values and Diagnostic Parameters


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