PRE-RELEASE
DTC P0458 or P0459 (LLU)
| DTC P0458 or P0459 (LLU) |
| Diagnostic Instructions |
| • |
Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
|
|
| • |
Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
|
|
| • |
Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
|
|
| DTC Descriptors |
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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|
Ignition Voltage Circuit
|
P0030 00, P0033 00, P0036 00, P0121 00, P0135 00, P0141 00, P0245 00, P0444 00,
|
P0444 00
|
-
|
-
|
|
Control Circuit
|
P0458 00
|
P0444 00
|
-
|
P0459 00
|
| Circuit/System Description |
The evaporative emission (EVAP) canister purge valve is used to purge fuel vapor from the EVAP canister to the intake manifold. The EVAP canister purge valve is pulse width modulated (PWM). Ignition voltage is supplied directly to the EVAP canister purge valve. The engine control module (ECM) controls the solenoid by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.
| Conditions for Running the DTC |
| • |
The engine speed is greater that 40 RPM.
|
|
| • |
The ignition voltage is between 8-16 V.
|
|
| • |
The DTCs run continuously when the above conditions are met.
|
|
| Conditions for Setting the DTC |
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 0.5 s.
| Action Taken When the DTC Sets |
DTCs P0458 00, or P0459 00 are Type B DTCs.
| Conditions for Clearing the DTC |
DTCs P0458 00, or P0459 00 are Type B DTCs
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Evaporative Emission Control System Description
Electrical Information Reference
| • |
Circuit Testing
|
|
| • |
Connector Repairs
|
|
| • |
Testing for Intermittent Conditions and Poor Connections
|
|
| • |
Wiring Repairs
|
|
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Ignition ON, command the EVAP purge solenoid valve to 50% with a scan tool. You should hear the solenoid click when commanded to 50%.
|
|
| 2. |
Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. 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 1 and ground.
|
|
| 3. |
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 F11 is open, test all components connected to the ignition voltage circuit and repair as necessary or replace the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve.
|
|
| 4. |
Connect a test lamp between the ignition voltage circuit terminal 1 and the control circuit terminal 2.
|
|
| 5. |
Command the EVAP canister purge solenoid valve to 50% with a scan tool. The test lamp should respond to the command.
|
|
| 6. |
If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
| 7. |
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 Engine Control Module.
|
|
| 8. |
If all circuits test normal, test or replace the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve.
|
|
| Component Testing |
Static Test
| 1. |
Ignition OFF, disconnect the harness connector at the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve.
|
|
| 2. |
Test for 10-30 Ω between the voltage supply terminal 1 and the K20 Engine Control Module control circuit terminal 2.
|
|
| 3. |
If not within the specified range, replace the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve.
|
|
| 4. |
Test for infinite resistance between each terminal and the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve, and the housing.
|
|
| 5. |
If not the within the specified value, replace the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve.
|
|
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • |
Evaporative Emission Canister Purge Solenoid Valve Replacement (LLU/A16LET)
|
|
| • |
Control Module References
for ECM replacement, setup, and programming
|
|
