Signal Too Low - Permanent Fault

ECM-6120 ENGINE COOLING FAN RELAY, FAULTY SIGNAL
SIGNAL TOO LOW - PERMANENT FAULT

Checking component and wiring



Check power supply cable for a short-circuit to ground 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) # A6 (# A6) and engine cooling fan (FC) relay # IN2 for a short-circuit to ground 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.