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DTC P0459 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT HIGH

DTC P0459 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT HIGH

DTC DETECTING CONDITION:


• Two consecutive driving cycles with fault

• GENERAL DESCRIPTION


TROUBLE SYMPTOM:

Erroneous idling

Important

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


WIRING DIAGRAM:


CHECK OUTPUT SIGNAL FROM ECM.

Turn the ignition switch to OFF.

Connect the test mode connector at the lower portion of instrument panel (on the driver’s side).

Turn the ignition switch to ON.

While operating the purge control solenoid valve, measure voltage between ECM and chassis ground.

Note

Purge control solenoid valve operation can be executed using Vehicle Diagnostic Interface. For procedure, refer to “Compulsory Valve Operation Check Mode”.


Connector & terminal

(B134) No. 14 (+) — Chassis ground (−):

Is the voltage 0 — 10 V?

Yes


No

Even if malfunction indicator light light up, the circuit has returned to a normal condition at this time. In this case, repair poor contact in ECM connector.


CHECK OUTPUT SIGNAL FROM ECM.

Turn the ignition switch to ON.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 14 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes


No


CHECK POOR CONTACT.

Check poor contact in ECM connector.

Is there poor contact in ECM connector?

Yes

Repair poor contact in ECM connector.


No

Replace the ECM.


CHECK HARNESS BETWEEN PURGE CONTROL SOLENOID VALVE AND ECM CONNECTOR.

Turn the ignition switch to OFF.

Disconnect the connector from purge control solenoid valve.

Turn the ignition switch to ON.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 14 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes

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


No


CHECK PURGE CONTROL SOLENOID VALVE.

Turn the ignition switch to OFF.

Measure the resistance between purge control solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 1 Ω?

Yes

Replace the purge control solenoid valve and ECM


No


CHECK POOR CONTACT.

Check poor contact in ECM connector.

Is there poor contact in ECM connector?

Yes

Repair poor contact in ECM connector.


No

Replace the ECM.