Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the heated oxygen sensor (HO2S)








- Ignition off
- Disconnect the connectors for the front (ECM-18) and rear (ECM-1C) heated oxygen sensor (HO2S).
Connect an ohmmeter between connector terminals 1 and 2 for the heated oxygen sensor (HO2S) (probe side).









The resistance should be 6-25 ohms depending on the temperature of the heated oxygen sensor (HO2S).

OK - Checking the signal cable

Not OK - Defective heated oxygen sensor (HO2S)

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Checking the signal cable








- Ignition off
- Disconnect the connectors for the front (ECM-18) and rear (ECM-1C) heated oxygen sensor (HO2S).
Check the cable between heated oxygen sensor (HO2S) connector terminal 2 (control module side) and engine control module (ECM) connector terminal 63 (ECM-18) or terminal 65 (ECM-1C) 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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Defective heated oxygen sensor (HO2S)
Try a new heated oxygen sensor (HO2S) according to Replace the front heated oxygen sensor (HO2S) Replace The Front Heated Oxygen Sensor (HO2S).

Select Continue.

Continue - Verification

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Verification








- Reconnect the connectors, reinstall components etc.
- Connect VCT 2000
- Start the engine.
Check whether diagnostic trouble code (DTC) ECM-18 or ECM-1C has changed status to intermittent.





Is diagnostic trouble code (DTC) ECM-18 or ECM-1C intermittent?

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 heated oxygen sensor (HO2S)

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