Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the terminal








- Ignition off
- Disconnect the connector for the atmospheric pressure sensor.
Check the atmospheric pressure sensor connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.





Was a fault detected?

Yes - Verification

No - Checking the power cable

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Checking the power cable








- Ignition on
- Atmospheric pressure sensor connector disconnected.
Connect a voltmeter between atmospheric pressure sensor connector terminal 1 (control module side) and the ground terminal.









The voltmeter should read approximately 5 V.

OK - Checking the signal cable

Not OK - Checking the power cable

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Checking the signal cable








- Ignition off
- Atmospheric pressure sensor connector disconnected.
Connect an ohmmeter between atmospheric pressure sensor connector terminal 3 (control module side) and the ground terminal.









The ohmmeter should read approximately 59 kohms.

OK - Checking the ground lead

Not OK - Checking the signal cable

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Checking the ground lead
Connect an ohmmeter between atmospheric pressure sensor connector terminal 2 (engine control module (ECM) side) and ground.









The ohmmeter should read approximately 0ohms.

OK - Defective atmospheric pressure sensor

Not OK - Checking the ground lead

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Defective atmospheric pressure sensor
Try a new atmospheric pressure sensor according to Replacing the atmospheric pressure sensor Replacing Atmospheric Pressure Sensor.

Select Continue.

Continue - Verification

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Checking the power cable
Check the cable between atmospheric pressure sensor connector terminal 1 (control module side) and engine control module (ECM) terminal 78 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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Checking the signal cable
Check the cable between atmospheric pressure sensor connector terminal 3 (control module side) and engine control module (ECM) terminal 18 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 ground lead
Check the cable between atmospheric pressure sensor connector terminal 2 (control module side) and engine control module (ECM) terminal 77 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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Verification








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Connect VCT 2000
- Ignition on.
Read off the BARO parameter.





Is the value OK?

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 - No Fault Found

Attempt New Test - Checking the terminal

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