Ignition Timing Control System

Inspection
1. Connect a timing light to the engine.
2. Crank the engine.




3. Verify that the timing mark (yellow) on the crankshaft pulley and the mark on-the timing belt cover are aligned.

Specification: BTDC 6-8° (7 +/- 1 °)

4. If not as specified, loosen the lock bolt and adjust by turning distributor.
5. If adjustment by turning distributor is not possible, check following.
^ PCM terminal voltage
IGT control signal and related wiring harnesses and connectors.
^ Camshaft position sensor
^ Ignition control module and related wiring harnesses and connectors.
6. Connect the data link connector terminals TEN and GND by using a jumper wire.
7. Start the engine.
8. Verify that spark retards as the engine warm up.
9. If not, check the following.
^ Engine coolant temperature sensor
10. Disconnect the jumper wire.
11. Warm up the engine to normal operation temperature.




12. Verify that the ignition timing is correct.




13. Increase the engine speed and verify that the ignition timing advances accordingly.
14. If not, check following
^ Mass air flow sensor