Faulty Signal

Faulty signal

Checking component




- Ignition off.
- Remove the system relay.
Check if there is an open-circuit in the system relay #30(1) and #87(3) according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: When the relay is not routed their should be an open circuit between the system relay #30(1) and #87(3). If there is not an open-circuit the relay is defective.

Check signal cable between engine control module (ECM) #85(4) and brake pedal sensor #B38 (#B50) for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box.
- To access/replace the system relay, see the relevant service procedure.
- The system relay coil #86(2) is connected to kl:30 and #87(3) and is connected to the engine control module (ECM) connector #B38 (#B50) and is actively low.
- For information about signals, see Signal specification Signal Description / Specification.





Has the fault been remedied?

Yes - Verification

No - Checking power cable

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Verification




Verification

Verification

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








- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Disconnect the connector from mass air flow (MAF) sensor.
- Check the voltage of the mass air flow (MAF) sensor #1. It should be approximately Ubat.
- Ignition off.
Check the system relay when it "releases" (approximately 2 minutes after ignition off).
Check the voltage on mass air flow (MAF) sensor #1. It should be 0 V when the system relay is not drawing on it.

Is the mass air flow (MAF) sensor #1 voltage 0 Volts?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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Checking power cable
Check if there is an open-circuit in the system relay base #87(3). The system relay base #87(3) should be without voltage.
If there is voltage in the system relay base #87(3), check the terminals and junctions from the base #87(3) (see wiring diagram) for a short-circuit to supply voltage Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box.
- To access/replace the system relay, see the relevant service procedure.
- The system relay #30(1) is connected to kl:30 and #87(3) is the output.
- For information about signals, see Signal specification Signal Description / Specification.






Continue - Verification

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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 component

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