Signal Missing - Permanent Fault

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

Checking component and wiring



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

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

Check cable between engine control module (ECM) # A6 and engine cooling fan (FC) relay # IN2 for an intermittent open-circuit according to 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.
- 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.
- Disconnect the Volvo Scan Tool (ST) from the VIDA station. Use it in stand alone mode and connect it to the data link connector (DLC) in the car.
- Ignition on.
- Go into scrolling values.

Check the outside temperature reading is correct. Compare with the actual air temperature.

Is the temperature reading OK?
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.