| 1 |
- Is customer complaint "Lack of passenger compartment heat" only?
|
Yes |
Inspect A/C and heater systems. |
| No |
Go to the next step. |
| 2 |
- Does engine speed continue at fast idle?
|
Yes |
Go to symptom troubleshooting "NO. 9 FAST IDLE/RUNS ON ". |
| No |
Go to the next step. |
| 3 |
|
Yes |
Go to the next step. |
| No |
Replace thermostat.
(See
THERMOSTAT REMOVAL/INSTALLATION
). |
| 4 |
- Inspect fan control system operation.
- Does fan control system work properly?
|
Yes |
Access ECT PID using M-MDS.
Inspect for 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 instrument cluster and related harnesses.
|
| No |
Repair or replace malfunctioning part. |
| 5 |
- Verify test results.
- If normal, 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, reprogram PCM if later calibration is available. Retest.
|