Timing Advance System
Ignition timing advance is controlled by ECU based upon sensor input signals which reflect ignition timing needs. If timing problems are experienced, inspect input signals for proper operation. See TIMING ADVANCE SYSTEM INPUT SIGNALS table. To check these input signals, see ENGINE SENSORS & SWITCHES in this article or ECU pin voltage charts in PIN VOLTAGE CHART
S article.
TIMING ADVANCE SYSTEM INPUT SIGNALS
| Application |
Model Usage |
| A/C Clutch Signal |
Q45 |
| Airflow Meter |
M30 & Q45 |
| Battery Voltage |
M30 & Q45 |
| Coolant Temperature |
M30 & Q45 |
| Crank Angle Sensor |
M30 & Q45 |
| Ignition Switch START Signal |
M30 & Q45 |
| Park/Neutral Signal |
Q45 |
| Power Steering Oil Pressure Switch |
Q45 |
| Throttle Position Sensor & Idle Switch |
M30 & Q45 |
| Vehicle Speed Sensor |
M30 &
Q45 |