Timing Advance System

PCM controls ignition timing advance based upon sensor input signals that reflect ignition timing needs. If timing problems are experienced, inspect input signals listed below for proper operation. To check input signals, see ENGINE SENSORS & SWITCHES  or PCM pin voltage charts in PIN VOLTAGE CHARTS article.

• A/C Clutch Signal
• Closed Throttle Position Switch
• Crankshaft Position Sensor
• Engine Coolant Temperature
• Ignition (START) Signal
• Mass Airflow Sensor
• Park/Neutral Switch
• Power Steering Pressure Switch
• Throttle Position Sensor
• Vehicle Speed Sensor