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DTC P0444 (LLU)

DTC P0444 (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 Descriptor

DTC P0444 00

Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit Open

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 240 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 5 s.

Action Taken When the DTC Sets

DTCs P0444 00 is a Type B DTC.

Conditions for Clearing the DTC

DTCs P0444 00 is a Type B DTC.

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. Test for 2.5-3.5 V between the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve control circuit terminal 2 and ground.

5. If less than the specified range, repair the short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

6. If greater than the specified range, test the Q12 Evaporative Emission (EVAP) Purge Solenoid Valve control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

7. Set the EVAP purge solenoid valve from 0-100 % using the scan tool. The DMM should change from 2.5-3.5 V at 0 % to less then 0.1 V when set to 100 %.

8. If the circuit voltage does not correspond to the specified values, replace the K20 Engine Control Module.

9. 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