Signal Missing - Permanent Fault

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

Checking connector



- Ignition off
- Check ignition coil connector for contact resistance and oxidation according to Checking Wiring and Terminals
- Reinstall components, reconnect connectors etc.
- Start the engine and let it idle.

Engine should run evenly.
If the engine is OK it means that the cause of the fault has been loose connections in the connector.

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

Is the engine idling evenly?
Yes - Testing complete.
No - Continue below.


Checking wiring and components



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 open-circuit according to Checking Wiring and Terminals

Remedy as necessary.

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


Verification



Hint: After carrying out the repair, check that the fault has been remedied.

- Ignition off.
- Reconnect the connectors, reinstall components etc.
- Start the engine and let it idle.

Engine should fire on all cylinders.

Is the engine idling evenly?
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.