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 for proper operation. See TIMING ADVANCE SYSTEM INPUT SIGNALS table. To check input signals, see ENGINE SENSORS & SWITCHES or ECM pin voltage charts in PIN VOLTAGE CHARTS article.
TIMING ADVANCE SYSTEM INPUT SIGNALS
| Application | Model Usage | ||
|---|---|---|---|
| A/C Clutch Signal | (1) Q45 | ||
| Battery Voltage | Q45 | ||
| Closed Throttle Position Switch | Q45 | ||
| Crankshaft Position Sensor | Q45 | ||
| Engine Coolant Temperature | Q45 | ||
| Ignition (START) Signal | Q45 | ||
| Mass Airflow Sensor | Q45 | ||
| Park/Neutral Switch | Q45 | ||
| Power Steering Pressure Switch | Q45 | ||
| Throttle Position Sensor | Q45 | ||
| Vehicle Speed Sensor | Q45 | ||
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