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DTC P0459: Evaporative Emission Control System Purge Control Valve Circuit High Input

 
 
 
 
CIRCUIT OPERATION
  • The evaporative emission purge solenoid power is supplied from the MFI relay.
  • The ECM controls ground evaporative emission purge solenoid by turning the power transistor in the ECM "ON" and "OFF".
 
 
TECHNICAL DESCRIPTION
  • In response to a signal from the ECM, the evaporative emission purge solenoid valve controls the flow rate of the purge air to be introduced into the intake manifold.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • The ECM detects short malfunction.
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart <Circuit continuity - shorted high>
Check Conditions
  • Engine is running.
Judgment Criterion
  • The coil current is more than 2.3 amperes with the evaporative emission purge solenoid driving for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • None
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Evaporative emission purge solenoid failed.
  • Open or shorted evaporative emission purge solenoid circuit, harness damage or connector damage.
  • ECM failed.

 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Using scan tool (M.U.T.-III), check actuator test item 10: Evaporative Emission Purge Solenoid.
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
(1) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) .
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool (M.U.T.-III) to the actuator test mode for item 10, Evaporative Emission Purge Solenoid.
  • An operation sound should be heard and vibration should be felt when the evaporative emission purge solenoid is operated.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the solenoid operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Go to Step 2.
 
STEP 2. Check the evaporative emission purge solenoid.
(1) Disconnect connector, and measure at solenoid side.
(2) Measure the resistance between evaporative emission purge solenoid side connector terminals.
Standard value: 30 - 34 Ω [at 20°C (68°F)]
Is the measured resistance between 30 and 34 Ω [at 20°C (68°F)]?
Go to Step 3.
Replace the evaporative emission purge solenoid. Then go to Step 5.
 
STEP 3. Check of short to power supply in PURG line between evaporative emission purge solenoid connector and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair the connector(s) or wiring harness. Then go to Step 5.
 
STEP 4. Using scan tool (M.U.T.-III), check actuator test item 10: Evaporative Emission Purge Solenoid.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool (M.U.T.-III) to the actuator test mode for item 10, Evaporative Emission Purge Solenoid.
  • An operation sound should be heard and vibration should be felt when the evaporative emission purge solenoid is operated.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the solenoid operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Replace the ECM (Refer to, Removal and Installation ). Then go to Step 5.
 
STEP 5. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0459 set?
Retry the troubleshooting.
The inspection is complete.