Basic Idle Speed (1.8L)
- Ensure vehicle is at operating temperature, all accessories are off and transmission is in Park or Neutral. Front wheels must be in a straight-ahead position.
- Insert paper clip in CRC (tachometer) filter connector, and connect tachometer to inserted clip. See Figure . Without starting engine, turn ignition on. Leave ignition on for 15 seconds. This completely closes Idle Speed Control (ISC) plunger. Turn ignition off. Disconnect ISC servomotor connector. See Fig 1 .
- Turn fixed Speed Adjusting Screw (SAS) until throttle valve is fully closed. See Fig 2 . Start engine, and let it idle. Check basic idle speed. See IDLE SPEED SPECIFICATIONS table. If basic idle speed is within specification, go to next step. If basic idle speed is not within specification, adjust by turning Idle Speed Control (ISC) adjusting screw. See Fig 2 . Go to next step.
- Turn fixed SAS until idle speed starts to increase. See Fig 2 . Turn fixed SAS counterclockwise until idle speed no longer drops (touch point).
- Turn fixed SAS counterclockwise an additional 1/2 turn from touch point. Turn engine off. Check TPS voltage using DVOM, and adjust TPS if necessary. See THROTTLE POSITION SENSOR (TPS). Disconnect DVOM after checking TPS voltage.
- Adjust accelerator cable free play (if necessary). Connect idle speed control servomotor connector. Start engine. Ensure engine is running at curb idle speed. See IDLE SPEED SPECIFICATIONS table.
- If curb idle speed is not within specification, diagnose ISC system. See appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE Section. Turn engine off. Remove all test equipment. Disconnect negative battery cable for 10 seconds to clear any trouble codes.
IDLE SPEED SPECIFICATIONS
| Application | Curb Idle | Basic Idle |
|---|---|---|
| 1.8L | 600-800 | 650-750 |
| 2.0L & 2.0L Turbo | 650-850 | 700-800 |