Signal Too Low or Signal Missing

Signal too low or signal missing

Checking the component and wiring
Check the fuse for the circuit.
Check the cable between engine control module (ECM) terminal #B7 (#C7) and engine cooling fan (FC) module terminal #4. Check for a short-circuit to ground.
Check between engine cooling fan (FC) connector terminal #2 and ground. Check for an open-circuit.
Check the power cable between the fuse for the engine cooling fan (FC) module and engine cooling fan (FC) module connector terminal #1. Check for an open-circuit.

Hint: The voltage must be approximately 12 V between engine cooling fan (FC) module connector (wiring side) terminals #1 and #2.

Remedy as necessary.

Other information
- Connecting the breakout box Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification Signal Specification, Engine Control Module (ECM) Signal specification Signal Specification, Engine Control Module (ECM)
- For further information about the fuses and relays, see the Wiring Diagram.
- Engine cooling fan (FC) Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals














Continue - Verification

-------------------------------------------------

Verification




Verification

Verification

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








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





Does the engine cooling fan (FC) start?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

-------------------------------------------------

Fault-tracing information




Information

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.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

------------------------

Attempt New Test - Checking the component and wiring

-------------------------------------------------