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Home >> Toyota >> 1988 >> Celica All-Trac >> Repair and Diagnosis >> Engine Performance >> System >> Computer Control System >> Component Testing >> Idle Speed Control (ISC) Valve >> 2WD 3S-FE

2WD 3S-FE

  1. Warm engine to normal operating temperature. Ensure idle speed is correct. Apply parking brake and place transaxle in Neutral. Install jumper wire between terminals "T" and "E1" of check connector located near left shock tower. See Fig 1.
  2. Note that engine RPM is maintained at 600-800 RPM on Celica models.
  3. If engine RPM was not within specification, disconnect ISC valve connector. Using ohmmeter, measure resistance between terminals "B +" and "ISC1" AND "ISC2". See Fig 2. Replace valve if resistance is not within 16-17 ohms.
Fig 1: 2WD 3S-FE Checking ISC Valve
G95391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Checking ISC Valve
G95392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002