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DTC P0509 IDLE CONTROL SYSTEM CIRCUIT HIGH

DTC P0509 IDLE CONTROL SYSTEM CIRCUIT HIGH

DTC DETECTING CONDITION:


• Immediately at fault recognition

• GENERAL DESCRIPTION


TROUBLE SYMPTOM:


• Erroneous idling

• Engine stalls.

• Engine breathing


Important

After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .


WIRING DIAGRAM:


CHECK THROTTLE CABLE.

Does the throttle cable have play for adjustment?

Yes


No

Adjust the throttle cable.


CHECK OUTPUT SIGNAL FROM ECM.

Turn the ignition switch to ON.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B137) No. 10 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes


No


CHECK OUTPUT SIGNAL FROM ECM.

Turn the ignition switch to OFF.

Disconnect the connector from idle air control solenoid valve.

Turn the ignition switch to ON.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B137) No. 10 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes

Repair the battery short circuit in harness between ECM and idle air control solenoid valve connector. After repair, replace the ECM.


No

Replace the idle air control solenoid valve. and ECM


CHECK OUTPUT SIGNAL FROM ECM.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B137) No. 10 (+) — Chassis ground (−):

Shake the ECM harness and connector, while monitoring value of voltage meter. Does the voltage change?

Yes

Repair the battery short circuit in harness between ECM and idle air control solenoid valve connector. After repair, replace the ECM.


No

Contact Service Center.