Signal Too Low. Permanent Fault

Permanent fault, signal too low

Checking the power supply








- Ignition off
- Disconnect air conditioning (A/C) relay 2/10
- Ignition on.
Connect a voltmeter between air conditioning (A/C) relay base terminal #1 and ground.









The voltmeter should read battery voltage.

OK - Checking the signal cable

Not OK - Checking the signal cable

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Checking the signal cable




- Ignition off.
Connect an ohmmeter between air conditioning (A/C) relay base terminal #2 and ground.









The ohmmeter should read infinite resistance.

OK - Checking air conditioning (A/C) relay

Not OK - Checking the signal cable

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Checking air conditioning (A/C) relay
Connect an ohmmeter between the air conditioning (A/C) relay terminals #1 and #2 (relay side).









The ohmmeter should read approximately 105 ohms at +20°C.

OK - Checking the signal cable

Not OK - Defective air conditioning (A/C) relay

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Checking the signal cable




- Ignition off.
Check the cable between air conditioning (A/C) system relay base terminal #2 and the engine control module (ECM) connector terminal #68 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

Continue - Verification

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Defective air conditioning (A/C) relay
Try a new air conditioning (A/C) relay.





Select Continue.

Continue - Verification

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Checking the signal cable
Check the cable between air conditioning (A/C) system relay base terminal #2 and the engine control module (ECM) connector terminal #68 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

Continue - Verification

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Checking the signal cable
Check the cable between air conditioning (A/C) system relay base terminal #2 and the engine control module (ECM) connector terminal #68 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

Continue - Verification

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Verification








- Reconnect the connectors, reinstall components etc.
- Connect VCT 2000
- Ignition on.
Activate the air conditioning (A/C) using the VCT 2000 according to Description of activations Description Of Activations.





Does the air conditioning (A/C) relay click?

Yes - FAULT FOUND

No - No Fault FoundFault-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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the power supply

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