Signal Missing. Permanent Fault

Signal missing. Permanent fault

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

Checking power cable








- Ignition off.
- Disconnect connector A from fan control (FC) relay.
Connect a voltmeter between relay connector A (engine control module (ECM) side) and ground.









The voltmeter should read battery voltage.

OK - Checking the signal cable

Not OK - There is an integrated fusible link between the starter motor and relay. If there is an open-circuit in this cable there is probably a short-circuit to ground in the circuit which caused the open-circuit. Check the relay and fan motor before replacing the cable. Check cable between starter motor and engine cooling fan (FC) relay terminal A1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for an open-circuit

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

Checking for an open-circuit








- There is an integrated fusible link between the starter motor and relay. If there is an open-circuit in this cable there is probably a short-circuit to ground in the circuit which caused the open-circuit. Check the relay and fan motor before replacing the cable. Check cable between starter motor and engine cooling fan (FC) relay terminal A1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

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

Checking the signal cable








- Ignition off.
- Connector A disconnected.
- 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 - Checking signal cable, high-speed

Not OK - Checking control module connector

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

Checking control module connector












- Ignition off.
- Connectors A and B disconnected.
- Check control module connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Control module connected.
- 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 - Checking for contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector. Then continue with Verification.

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

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

Checking for contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.




- Check connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

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

Checking for an open-circuit








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

Continue - Verification

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

Checking signal cable, high-speed








- Ignition off.
- Connectors A and B disconnected.
- Ignition on.
Connect a voltmeter between relay connector B terminal 2 (engine control module (ECM) side) and ground.









The voltmeter should read approximately 3 V.

OK - Checking engine cooling fan (FC) relay

Not OK - Check cable between engine cooling fan (FC) relay connector B2 and engine control module (ECM) #A22 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for a short-circuit

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

Checking for a short-circuit








- Check cable between engine cooling fan (FC) relay connector B2 and engine control module (ECM) #A22 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

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

Checking engine cooling fan (FC) relay








- Ignition off.
- Connect connectors A and B to engine cooling fan (FC) relay.
- Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
- Start the engine and idle it.
- Go into the Diagnostic Test Mode (DTM) menu.
- Watch EFI-514, wait until the status of EFI-514 switches to tested. This can take up to 15 minutes after the engine has been started.

Is the diagnostic trouble code (DTC) still permanent?

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

No - The cause of the diagnostic trouble code (DTC) has been loose connections in the engine cooling fan (FC) relay and/or control module connectors. Check connectors for contact resistance and oxidation and remedy in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for contact resistance and oxidation

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

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

Continue - Verification

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

Checking for contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) has been loose connections in the engine cooling fan (FC) relay and/or control module connectors.




- Check connectors for contact resistance and oxidation and remedy in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

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

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

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

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

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

VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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

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 power cable

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