Idle SPPED Input Signals
Base idle speed is controlled by ECU through AAC valve (and FICD valve on M30). ECU controls idle speed component(s) based upon signals received from various input devices. If idle speed component(s) test correctly but idle speed is not being regulated properly, check input signals to ECU. See IDLE SPEED SYSTEM INPUT SIGNALS table.
IDLE SPEED SYSTEM INPUT SIGNALS
| Application |
Model Usage |
| A/C Clutch Signal |
M30 & Q45 |
| Airflow Meter |
Q45 |
| Battery Voltage |
M30 & Q45 |
| Crank Angle Sensor |
M30 & Q45 |
| Engine (Coolant) Temperature |
M30 & Q45 |
| Ignition (START) Switch |
M30 & Q45 |
| Park/Neutral (Inhibitor) Switch |
M30 &
Q45 |
| Power Steering Pressure Switch |
Q45 |
| Throttle Position Sensor |
M30 & Q45 |
| Throttle (Idle) Switch |
M30 & Q45 |
| Vehicle Speed Sensor |
M30 & Q45 |