TEST NTC-4A - CHECKING COOLANT SENSOR CALIBRATION
Note. Perform TEST NTC-1A or NTC-3A before proceeding.
- Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If engine operating temperature is more than 180°F (82°C), allow engine to cool to 150°F (66°C). Start engine. While monitoring scan tool, allow engine to reach normal operating temperature of more than 180°F (82°C). Go to next step.
- If ECT sensor value increased in a smooth transition, go to next step. If ECT sensor value did not increase in a smooth transition, verify engine cooling system is not malfunctioning. If engine cooling system is malfunctioning, repair as necessary. Perform TEST VER-2A. If engine cooling system is not malfunctioning, replace ECT sensor. Perform TEST VER-2A.
- If engine coolant temperature reached 180°F (82°C) or more, cooling system is functioning properly. Test is complete. If engine coolant temperature did not reach 180°F (82°C) or more, verify engine cooling system is not malfunctioning. If engine cooling system is malfunctioning, repair as necessary. Perform TEST VER-2A. If engine cooling system is not malfunctioning, replace ECT sensor. Perform TEST VER-2A.
TEST NTC-16A - CHECKING TIMING BELT ADJUSTMENT
Note. Perform TEST NTC-1A or NTC-15A before proceeding.
| CAUTION | A loose timing belt or improper belt replacement can cause it to jump a tooth or more. Improper timing belt replacement may cause severe engine damage. |
- This procedure verifies proper crank and cam positions first, then updates Powertrain Control Module (PCM). Verify engine valve timing is within specification. See appropriate article in ENGINES. If engine valve timing is within specification and vehicle is a PL Body, go to step 3 . If engine valve timing is within specification and vehicle is NOT a PL Body, repair is complete. Perform TEST VER-2A. If engine valve timing is not within specification, repair engine valve timing as necessary. Go to next step.
- Using scan tool, select ADJUSTMENTS, then RELEARN CMP/CKP. Repair is complete. Perform TEST VER-2A.
- If PCM or any part tied to timing belt has been replaced, using scan tool, select ADJUSTMENTS, then RELEARN CMP/CKP. Repair is complete. Perform TEST VER-2A. If PCM or any part tied to timing belt has not been replaced, cam and crankshafts are positioned properly. Test is complete.