System Inspection

SYSTEM INSPECTION
1. Turn off following electrical loads.
- Power steering
- A/C







2. Connect the special service tool (SST) or equivalent timing light to the ignition timing checking harness with the arrow on its clamp facing the connector.




3. Connect the data link connector terminals TEN and GND with a jumper wire.




4. Start the engine and verify that the ignition timing retards as the engine warms up.
5. If not as specified, check engine control module (ECM) terminal 3Q (Engine coolant temperature sensor) voltage.
6. Disconnect the jumper wire.
7. Verify that the engine is completely warmed up.




8. Increase the engine speed and verify that the ignition advances accordingly.
9. If not as specified, check voltage at following terminals.
- ECM terminal 3E (Mass air flow sensor)
- ECM terminal 4AH 4AL (Crankshaft position sensor)