Electronic Spark Advance (ESA) Control System

1. Turn off following electrical loads.
- Power steering
- A/C
2. Connect a timing light to the high-tension lead of No.1 cylinder.

CAUTION: Connecting the wrong DLC terminal may possibly cause a malfunction. Carefully connect the specified terminal only.




3. Short the DLC terminal TEN to body GND using a jumper wire.




4. Start the engine and verify that the ignition timing retards as the engine warms up.
- If not as specified, check the PCM terminal 3Q (ECT sensor) voltage.
5. Disconnect the SST.
6. Verify that the engine is completely warmed up.




7. Increase the engine speed and verify that the ignition advances accordingly.
- If not as specified, inspect voltage at following terminals.
- PCM terminal 3E (MAF sensor)
- PCM terminal 4AH 4AL (CKP sensor)