Signal Too High. Permanent Fault

Signal too high. Permanent fault

EFI-514 Engine cooling fan (FC) low-speed, signal

Checking the signal cable








- Ignition off.
- Disconnect engine cooling fan (FC) relay connector B.
- Ignition on.
Connect a voltmeter between relay connector B terminal 1 (engine control module (ECM) side) and ground.









The voltmeter should read approximately 6 V.

OK - Try a new engine cooling fan (FC) relay. Then continue with Verification.
Replacing component

Not OK - Check cable between engine cooling fan (FC) relay terminal B1 and engine control module (ECM) #A7 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for a short-circuit

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Replacing component
- Try a new engine cooling fan (FC) relay.





Continue - Verification

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Checking for a short-circuit








- Check cable between engine cooling fan (FC) relay terminal B1 and engine control module (ECM) #A7 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

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Verification




Verification

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








- Ignition off.
- Engine cooling fan (FC) relay and engine control module (ECM) connected.
- Ignition on.




- Select Volvo Scan Tool (ST) to activate the engine cooling fan (FC) (low-speed).

The engine cooling fan (FC) should run at low-speed.

OK - Verification, continued

Not OK - VERIFICATION FAILED

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Verification, continued




- Ignition on.




- Select Volvo Scan Tool (ST) to activate the engine cooling fan (FC) (high-speed).

The engine cooling fan (FC) should run at high-speed.

OK - VERIFIED

Not OK - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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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

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Attempt New Test - Checking the signal cable

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