Signal Too Low

ECM-6110 ENGINE COOLING FAN (FC) RELAY, LOW SPEED
SIGNAL TOO LOW

Checking for intermittent fault



- Ignition on.
- Activate engine cooling fan (FC), low-speed.

Check that engine cooling fan (FC) starts and runs at low-speed.

Does the engine cooling fan (FC) start and run at low-speed?
Yes - Continue below.
No - Skip to "Checking Connector"


Checking connector (resistance)



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


Checking Connector



- Reinstall components, reconnect connectors etc.
- Ignition on.
- Activate engine cooling fan (FC), low-speed.
Check whether engine cooling fan (FC) starts and runs at low-speed.

If the engine cooling fan (FC) now starts it means that the cause of the fault was loose connections in the connector.

Other information
- To access/replace the engine cooling fan (FC) relay, Replacing Relay In the Main Fuse Box
- For information about signals, Pinout Values and Diagnostic Parameters

Does the engine cooling fan (FC) start and run at low-speed?
Yes - Testing Complete.
No - Continue below.


Checking wiring and components



Check cable between control module # A6 and engine cooling fan (FC) relay # B1 for a short-circuit to ground according to [1][2]Checking Wiring and Terminals. Permanent Fault, and for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Check cable between engine cooling fan (FC) relay # B30 and main fuse 1 for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

If no fault is found in the wiring, try a new relay for the engine cooling fan (FC).

Other information
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the control module, Engine Control Module (ECM), Replacing
- To access/replace the engine cooling fan (FC) relay, Replacing Relay In the Main Fuse Box
- For information about signals, Pinout Values and Diagnostic Parameters


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components
- Ignition on.
- Activate engine cooling fan (FC), low-speed.

Check whether engine cooling fan (FC) starts and runs at low-speed.

Does the engine cooling fan (FC) start and run at low-speed?
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.