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Idle Speed Control System: 2.2L

  1. Warm engine to normal operating temperature. Ensure idle speed is correct. See ADJUSTMENTS article in the ENGINE PERFORMANCE Section.
  2. Apply parking brake and place transmission/transaxle in Neutral. Install jumper wire between terminals TE1 and E1 of engine check connector. See Fig 1.
  3. Engine RPM should increase to 1000-1300 RPM (Camry) for 5 seconds, and then return to idle.
  4. If engine RPM is not as specified, check Idle Speed Control (ISC) valve, wiring to ECU, ECU grounds and ECU. If engine RPM was within specification, remove jumper wire. Turn ignition off.
  5. To check ISC valve resistance, disconnect electrical connector from ISC valve on lower edge of throttle body. Using ohmmeter, measure resistance between terminal B+ and each remaining terminal. See Fig 2.
  6. Replace ISC valve if resistance is not within specification. See ISC VALVE RESISTANCE SPECIFICATIONS (EXCEPT 3.0L)  table.
  7. Remove ISC valve to check ISC valve operation. Connect battery to proper terminals and ensure valve opens and closes. See Fig 3 and Fig 4 . Replace ISC valve if defective.
ISC VALVE RESISTANCE SPECIFICATIONS (EXCEPT 3.0L)

Application Ohms
Camry 2.2L 19.3-22.3
Fig 1: Identifying Engine Check Connector Terminals (2.2L)
G92D27659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Checking ISC Valve Resistance (2.2L)
G92J27663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Checking ISC Valve Operation - Closed (2.2L)
G92C27666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Checking ISC Valve Operation - Open (2.2L)
G92E27668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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