Idle Control System: Notes
Idle speed is controlled by ECU through AAC valve and Fast Idle Control Device (FICD) valve. 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 |
G20 & M30 |
| Battery Voltage |
G20 & M30 |
| Crank Angle Sensor |
G20 & M30 |
| Engine (Coolant) Temperature |
G20 & M30 |
| Ignition (START) Switch |
G20 & M30 |
| Neutral Switch |
G20 |
| Park/Neutral (Inhibitor) Switch |
G20 &
M30 |
| Power Steering Pressure Switch |
G20 & M30 |
| Throttle Position Sensor |
G20 & M30 |
| Throttle (Idle) Switch |
M30 |
| Vehicle Speed Sensor |
G20 & M30 |