Diagnostic procedure
COOLING SYSTEM CONCERNS-RUNS COLD - DIAGNOSTIC PROCEDURE
| STEP |
INSPECTION |
ACTION |
| 1 |
- Is customer complaint "Lack of passenger compartment heat" only?
|
Yes |
Inspect A/C and heater systems. |
| No |
Go to next step. |
| 2 |
- Does engine speed continue at fast idle?
|
Yes |
Go to symptom troubleshooting in NO.9 FAST IDLE/RUNS ON . |
| No |
Go to next step. |
| 3 |
|
Yes |
Access ECT PID on WDS or equivalent.
Inspect both ECT PID and temperature gauge on instrument cluster readings.
- If temperature gauge on instrument cluster indicates normal range but ECT PID is not same as temperature gauge reading, inspect ECT sensor.
- If temperature gauge on instrument cluster indicates cold range but ECT PID is normal, inspect temperature gauge and heat gauge unit.
|
| No |
Replace thermostat. |
| 4 |
- Verify test results.
- If okay, return to diagnostic index to service any additional symptoms.
- If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
- If vehicle is repaired, troubleshooting completed.
- If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram PCM.
|