DTC P0443, P0458, or P0459
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DTC P0443, P0458, or P0459
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DTC P0443
Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit
DTC P0458
Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit Low Voltage
DTC P0459
Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit High Voltage
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Diagnostic Fault Information
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Circuit
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Short to Ground
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High Resistance/Open
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Short to Voltage
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Ignition 1 Voltage - Purge Supply
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P0443
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P0443
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-
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EVAP Purge Solenoid Control
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P0458
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P0443
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P0459
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Circuit/System Description
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An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge solenoid valve. The engine control module (ECM) grounds the EVAP canister purge solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the driver. The EVAP canister purge solenoid valve is pulse width modulated. A scan tool will display the amount of ON time as a percentage.
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Conditions for Running the DTC
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The engine RPM is greater than 80.
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The system voltage is between 10-18 V.
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DTCs P0443, P0458, or P0459 run continuously when the above conditions are met.
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Conditions for Setting the DTC
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The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match, for up to 0.5 s.
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Action Taken When the DTC Sets
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DTCs P0443, P0458, and P0459 are Type B DTCs.
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Conditions for Clearing the MIL/DTC
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DTCs P0443, P0458, and P0459 are Type B DTCs.
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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With the ignition ON, engine OFF, you should hear a clicking sound when the EVAP Purge Solenoid Valve is commanded to 50% with a scan tool. The clicking sound should stop when the EVAP canister purge solenoid valve is commanded to 0%. The rate at which the valve cycles should increase when the commanded state is increased, and decrease when the commanded state is decreased. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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1.
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Ignition OFF, disconnect the harness connector at the Q12 EVAP Purge Solenoid Valve.
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2.
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Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal A and ground.
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3.
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If the test lamp does not illuminate, test the ignition volage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test or replace the Q12 EVAP Purge Solenoid Valve.
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4.
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Connect a test lamp between the ignition voltage circuit terminal A and the control circuit terminal B.
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5.
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Command the EVAP Purge Solenoid Valve to 50% with a scan tool. The test lamp should respond to the command.
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6.
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If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
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7.
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If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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8.
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If all circuits test normal, replace the Q12 EVAP Purge Solenoid Valve.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
