Electronic Spark Advance (ESA) Control System

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







2. Connect the SST (timing light) to the ignition timing checking harness with the arrow on its cramp facing the connector.




3. Connect the SST (system selector) to the data link connector.
4. Set switch A to position 1.
5. Set the test switch to SELF TEST.
6. Start the engine and verify that the ignition timing retards as the engine warms up.
7. If not as specified, check the PCM terminal 3Q (Engine coolant temperature sensor) voltage. (Refer to POWERTRAIN CONTROL MODULE (PCM) INSPECTION.)

Testing and Inspection

8. Disconnect the SST (system selector).
9. Verify that the engine is completely warmed up.




10. Increase the engine speed and verify that the ignition advances accordingly.

11. If not as specified, check voltage at following terminals.
- PCM terminal 3E (Mass air flow sensor)
- PCM terminal 4AH 4AL (Crankshaft position sensor)