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Closed Throttle (Idle) Switch Test

NOTE: All testing of idle switch must be done with ISA motor plunger in fully extended position. If switch cannot be tested without extending plunger, it is possible that ISA motor has failed. Refer to IDLE SPEED ACTUATOR (ISA) MOTOR (1 .4L & 1.7L ONLY) adjustment procedures under ADJUSTMENT.
  1. Turn ignition on. Check idle switch voltage at diagnostic connector between terminals D2-13 and D2-7/ground. At closed throttle, voltage should be near zero volts. When switch is off closed throttle position, voltage reading should be greater than 2 volts.
  2. If voltage is always zero, test for short to ground in harness or switch. Also check for open circuit between switch and terminal No. 25 of ECU connector. If reading is always greater than 2 volts, check for open circuit in wiring harness between switch connector and ECU. Also check for open between ground and switch connector. Replace or repair wiring harness as necessary.
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