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 [1][2]Checking Wiring and Terminals. Intermittent Faults and loose connections according to [1][2]Checking Wiring and Terminals. Intermittent Faults

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 [1][2]Checking Wiring and Terminals. Intermittent Faults

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. Signal Description, ME7, B5XX4T


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