P0443
DTC P0443, P0458, or P0459
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0443 00
- Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit
DTC P0458 00
- Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit Low Voltage
DTC P0459 00
- Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
An ignition voltage is supplied directly to the 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 (PWM). A scan tool will display the amount of ON time as a percentage.
Conditions for Running the DTC
* Engine is running.
* DTCs P0606 00, P0628 00, or P0629 00 are not set.
* The battery voltage is greater than 9 V.
Conditions for Setting the DTC
P0443 00
PWM signal is between 8.2 and 99%
P0458 00
PWM signal is less than 99%
P0459 00
PWM signal is greater than 0.3%
Action Taken When the DTC Sets
DTCs P0443 00, P0458 00 and P0459 00 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0443 00, P0458 00 and P0459 00 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Evaporative Emission Control System Description (Evaporative Emission Control System Description)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve.
2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 2 and ground.
• If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the voltage supply circuit fuse is open, test or replace the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve.
3. Ignition OFF, test for more than 500 kohm between the control circuit terminal 1 and ground.
• If less than the specified range, repair the short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
4. Ignition OFF, test for less than 0.3 V between the control circuit terminal 1 and ground.
• If more than the specified range, repair the short to B+. If the circuit tests normal, replace the K20 Engine Control Module.
5. Ignition OFF, disconnect the K20 Engine Control Module. Test for less than 5 ohm between the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve connector terminal 1 and the K20 Engine Control Module terminal 15 X1.
• If more than the specified range, repair the open circuit. If the circuit tests normal, replace the K20 Engine Control Module.
Component Testing
Static Test
Ignition OFF, disconnect the harness connector at the solenoid. measure for 10-30 ohm between the voltage supply terminal 2 and the control circuit terminal 1.
If not within the specified range, replace the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Evaporative Emission Canister Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming