Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the signal cable








- Ignition off
- Engine coolant temperature (ECT) sensor connector disconnected.
Connect an ohmmeter between engine coolant temperature (ECT) sensor connector terminal #1 (control module side) and ground.









The ohmmeter must read more than 1000 ohms.

OK - Defective engine coolant temperature (ECT) sensor

Not OK - Checking the cable

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Defective engine coolant temperature (ECT) sensor
Try a new engine coolant temperature (ECT) sensor according to Replacing the engine coolant temperature (ECT) sensor Replacing Engine Coolant Temperature (ECT) Sensor.

Select Continue.

Continue - Verification

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Checking the cable
Check the cable between engine coolant temperature sensor connector terminal #1 and engine control module (ECM) terminal #47. Check 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




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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the signal cable

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