Timing Advance System
ECM 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 ECM pin voltage charts in PIN VOLTAGE CHARTS article.
- Battery Voltage
- Camshaft Position (CMP) Sensor
- Mass Airflow Sensor
- Engine Coolant Temperature
- Ignition (START) Signal
- Knock Sensor
- Park/Neutral Switch
- Power Steering Pressure Switch
- Throttle Position Sensor
- Vehicle Speed Sensor
- Secondary Throttle Position Sensor (Q45 only)