Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

****Some values in these diagnostic procedures are incorrect, refer to the following 2 tables for updated values or to TSB - 03-36-024 for updated values****










IDLE SPEED CONTROL ACTUATOR
The idle speed control actuator is the double coil type. The two coils are driven by separate driver stages in the PCM. Depending on the pulse duty cycle, the equilibrium of the magnetic forces of the two coils will result in different angles of the motor. In parallel to the throttle valve, a bypass line is controlled by the idle speed actuator.

Circuit Diagram:

Troubleshooting Procedures:

TROUBLESHOOTING HINTS
The MIL turns ON or the DTC is displayed on the HI-SCAN PRO under the following conditions;
- When the primary voltage side in PCM is in short or open circuit.
- The ignition control by the PCM is malfunctioning.
- Open or short circuit is observed in idle air control system when ignition switch is turned on.

Using Hi-Scan:

Harness Inspection Procedure:

ACTUATOR INSPECTION
1. Disconnect the connector at the idle speed control actuator.
2. Measure the resistance between terminals.

Standard value
Terminal 3 and 2 : 16.6-18.6 ohm
Terminal 1 and 3 : 14.5-16.5 ohm [at 20 °C (68 °F)]




3. Re-connect the connector to the idle speed control actuator