Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the connector








- Ignition off
- Intake air temperature (IAT) sensor connector disconnected.
Connect an ohmmeter between intake air temperature (IAT) sensor connector terminal #1 (control module side) and ground.





The ohmmeter should read 3,000-4,500 ohms.

OK - Defective intake air temperature (IAT) sensor

Not OK - Checking the cable

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Defective intake air temperature (IAT) sensor
Try a new intake air temperature (IAT) sensor according to Replacing the intake air temperature sensor Service and Repair.

Continue - Verification

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Checking the cable
Check the cable between intake air temperature (IAT) sensor connector terminal #1 and engine control module (ECM) terminal #48. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.





Continue - Verification

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Verification




Verification

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








- Reconnect the connectors, reinstall components etc.
- Start the engine. Let the engine idle.
Read off diagnostic trouble codes (DTCs).
Check that the status of the diagnostic trouble code (DTC) has changed to intermittent. The fault has been remedied if the status of the diagnostic trouble code (DTC) has changed to intermittent.





Has the status of the diagnostic trouble code (DTC) changed to intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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 - Checking the connector

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