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Fast Idle Control Solenoid Valve

  1. Connect system checker harness between ECU and connector. Start engine. Connect voltmeter positive probe to terminal B4 (Blue/Black wire) and negative probe to terminal A18 (Black/Red wire). Voltage should be .5-1.5 volts.
  2. If no voltage, check for open circuit in Black/Yellow wire between No. 4 fuse and fast idle control solenoid valve, open circuit in Green/Yellow wire between fast idle control solenoid valve and ECU, or an open circuit in fast idle control solenoid valve. If 9 volts or more is available, replace ECU.
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