Faulty Signal

Faulty signal

EFI-432, EFI-513 Temperature warning levels 1 and 2

Checking engine cooling fan (FC)

- Select Volvo Scan Tool (ST) to activate engine cooling fan (FC).
- Check that the engine cooling fan (FC) is working and that air is sucked into the control module box air hose connector on the fan shroud.

Is the engine cooling fan (FC) working and is air sucked into the hose connector?

Yes - Checking air supply

No - Fault-trace according to Signal too high. Permanent fault Signal Too High. Permanent Fault Signal missing. Permanent fault Signal Missing. Permanent Fault Signal too low. Permanent fault Signal Too Low. Permanent Fault.
Signal too high. Permanent fault Signal Too High. Permanent Fault

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Checking air supply

- Ignition on.
- Blower fan on highest speed.
- Close the dashboard air vents.

Check that a gentle stream of air is being blown out of the control module box air hose.

OK - Control module box cooling is working. Erase diagnostic trouble code (DTC).
Fault-tracing information

Not OK - Check that hoses and hose connectors are in place, are not blocked and are correctly connected. Clean or replace defective components.
Replacing component

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Fault-tracing information

- Control module box cooling is working. Select Volvo Scan Tool (ST) to erase diagnostic trouble code (DTC).

Continue - FAULT FOUND

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Replacing component
- Check that hoses and hose connectors are in place, are not blocked and are correctly connected. Clean or replace defective components.

Continue - Verification

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Verification

Signal too low. Permanent fault

5-1-4 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 -

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. So check the relay and engine coolant fan (FC) motor before replacing the cable according to Replacing engine cooling fan (FC) fusible link cable Replacing Engine Cooling Fan (FC) Fusible Link 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.

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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. So check the relay and engine coolant fan (FC) motor before replacing the cable according to Replacing engine cooling fan (FC) fusible link cable Replacing Engine Cooling Fan (FC) Fusible Link 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 -

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Checking the signal cable, half speed

- Ignition off.
- Connector A disconnected.
- Disconnect engine cooling fan (FC) relay connector B.

- Connect an ohmmeter between relay connector B terminal 1 (engine control module (ECM) side) and ground.

The ohmmeter should read 28 - 38 kohms.

OK -

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

High -

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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 ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue -

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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.

- Connect an ohmmeter between relay connector B terminal 1 (engine control module (ECM) side) and ground.

The ohmmeter should read 28 - 38 kohms.

OK -

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.

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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 -

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Checking signal cable, high-speed

- Ignition off.
- Connectors A and B disconnected.

- Connect an ohmmeter between relay connector B terminal 2 (engine control module (ECM) side) and ground.

The ohmmeter should read 100 kohms- infinite resistance.

OK -

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.

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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 -

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Checking control module number

Checking control module number

Checking control module number

- Start the engine and idle it.

- Select Volvo Scan Tool (ST) symbol to read off control module P/N.
- If the engine control module (ECM) has any of the above P/Ns (first seven digits) it is equipped with an immobilizer.

Is the car with a immobilizer?

Yes - IMMO

No - EJIMMO

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IMMO -

EJIMMO -

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Checking engine cooling fan (FC) relay

- Ignition off.
- Connect connectors A and B to engine cooling fan (FC) relay.
- Start the engine and idle it.

- Read off diagnostic trouble code (DTC) status message.

Is the diagnostic trouble code (DTC) still permanent?

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

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.

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Checking engine cooling fan (FC) relay

- Ignition off.
- Connect connectors A and B to engine cooling fan (FC) relay.
- Start the engine and idle it.

Continue -

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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 -

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Verification

Verify

Verification

Hint: After repair, it is necessary to check that the fault has been corrected.
Perform as described below:

- Ignition off.
- Reconnect connectors, components etc.
- Ignition on.

- Select VST symbol to activate DTM 3.

Fan should run at both half and full speed during DTM 3.

OK - VERIFIED

Not OK - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED -

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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 -

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Verification

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

- Ignition on.
- Blower fan on highest speed.
- Close the dashboard air vents.

Check that a gentle stream of air is being blown out of the control module box air hose.

OK - FAULT FOUND

Not OK - Fault-tracing information

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Fault-tracing information
Information
Attempt New Test - Checking engine cooling fan (FC)

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