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Code 24 - Idle Air Control Solenoid Valve

NOTE: Refer to illustration for connector and terminal identification. See Figure -Figure .
  1. With engine warm and idling, measure voltage between ECM connector E29, terminal No. 2 (backprobe) and ground, then measure voltage between ECM connector E29, terminal No. 1 and ground. Voltage should be less than one volt on one terminal and more than 13 volts on other terminal. Voltage readings may switch if ECM tries to regulate idle speed while testing. If voltage readings are correct, repair ECM harness connector or replace ECM. If indicated voltage readings are not present, go to next step.
  2. Turn ignition off. Disconnect IAC connector. Measure resistance between IAC valve terminals No. 1 and 2, and between terminals No. 2 and 3. If 32 ohms are present, go to next step. If 32 ohms are not present, replace IAC solenoid valve.
  3. Turn ignition on. Measure voltage between IAC connector terminal No. 2 (Yellow/Red wire) and ground. If minimum 10 volts are present, repair or replace connector between ECM and IAC valve. If minimum of 10 volts are not present, repair or replace harness connector.
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