ENGINE (DIAGNOSTICS)(H4SO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0459 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE CIRCUIT HIGH

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

Improper idling

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM and purge control solenoid valve.

3) Turn the ignition switch to ON.

4) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B137) No. 29 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Repair the short circuit to power in the harness between the ECM and purge control solenoid valve connector.

2.CHECK PURGE CONTROL SOLENOID VALVE.

1) Turn the ignition switch to OFF.

2) Measure the resistance between purge control solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 1 Ω?

Replace the purge control solenoid valve.

Repair the poor contact of the ECM connector.