Code No. P0459: Purge Control Solenoid Valve Circuit High Input


OPERATION



  • Power is supplied to the purge control solenoid valve connector terminal from the engine control relay connector terminal.
  • The engine-ECU connector terminal PURG makes the power transistor in the unit be in ON position, and that makes currents go on the purge control solenoid valve connector terminal.

FUNCTION



  • In response to a signal from the engine-ECU, the purge control solenoid valve controls the flow rate of the purge air to be introduced into the inlet manifold.

TROUBLE JUDGMENT


Check Conditions
  • Battery positive voltage is more than 10 V and is less than 16.5 V.
Judgement Criterion
  • The solenoid current is more than 2.3 A with the purge control solenoid valve driving.

FAIL-SAFE AND BACKUP FUNCTION



  • None

PROBABLE CAUSES



  • Failed purge control solenoid valve
  • Short circuit or harness damage in purge control solenoid value circuit or loose connector contact
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

  • Item 10: Purge control solenoid valve
OK: Operating sound can be heard and the valve vibrates

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.

STEP 2. Check harness between purge control solenoid valve connector terminal and engine-ECU connector terminal PURG.

  • Check output line for short circuit.

Q. Is the check result normal?
Go to Step 3.
Repair or replace the connector, or repair the damaged harness wire.

STEP 3. M.U.T.-III actuator test

  • Item 10: purge control solenoid valve
OK: Operating sound can be heard and the valve vibrates

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU.