Manual Transmission

Cold Advance Circuit PCM/ECM:

PURPOSE
The cold advance control circuit is designed to advance the injection timing about 5° during cold operation. The PCM controls a cold advance relay which in turn controls the cold advance solenoid.

CIRCUIT DESCRIPTION
With the key "ON," and coolant temperature below 80°F, the ECM/PCM grounds CKT 421 to the cold advance relay. Grounding CKT 421 turns "ON" the relay, to supply 12 volts to the cold advance solenoid, in the injection pump, and the glow plug controller The cold advance solenoid is now energized, which causes the injection timing to be advanced approximately 5°.