Aerio L4-2.3L (2006)
1. Confirm that DTC P0116, DTC P0117 and/or DTC P0118 are not detected.If it is detected, go to each diagnostic flow table.
2. Turn ignition switch to OFF position.
3. Remove combination meter.
4. Confirm that there is no abnormal point in "YEL/GRN" wire of combination meter harness.
5. Confirm that there are no abnormal point in power and ground wire circuit of combination meter harness.
6. Connect combination meter connectors from combination meter.
7. Connect oscilloscope between terminals "YEL/GRN" and "BLK" wire of combination meter connector.
8. Turn ignition switch to ON position.
9. Check that there is waveform from ECM to engine coolant temperature meter.
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If check result is satisfied, replace combination meter.
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If check result is not satisfied, substitute a known-good ECM and recheck.
Engine Coolant Temperature (ECT) Meter Symptom Diagnosis
