Signal Missing - Permanent Fault

ECM-6110 ENGINE COOLING FAN (FC) RELAY LOW SPEED
SIGNAL MISSING - PERMANENT FAULT

Checking component and wiring



Check engine cooling fan (FC) relay connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Permanent Fault

Check the power supply cable for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault, also check that the fuse has not blown.

Check cable between engine control module (ECM) # A7 and engine cooling fan (FC) relay # IN1 for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary

Other information:
- Connecting the breakout box/accessing the control module Connecting the Breakout Box (ECM)
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T
- The engine cooling fan (FC) relay is supplied with power via fuse 11A/1


Verification



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

- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Activate engine cooling fan (FC).

Does the engine cooling fan (FC) start?
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.