• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Evaporative Emission Control System Description

Ignition Voltage=Greater than 11.0 V

Frequency the DTC runs=Continuously—After the running conditions are met

Control Circuit=Commanded state does not match the actual state—For greater than 5 s

DTCs listed in the DTC Descriptor category=Type B DTC

DTCs listed in the DTC Descriptor category=Type B DTC

Engine Controls Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Perform the scan tool control function:EVAP Purge Solenoid Valve»From 0 to 50% and back to 0%.

   Verify the scan tool parameter:

• EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status=Not RunorOK
• EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status=Not RunorOK
• EVAP Purge Solenoid Valve Control Circuit Open Test Status=Not RunorOK
• If not the specified state

  Refer to: Circuit/System Testing

• If the specified state
3. Perform the scan tool control function:EVAP Purge Solenoid Valve»From 0 to 50% and back to 0%.

   Verify a click can be heard or felt at the following component(s) when the scan tool control function was commanded:Q12 Evaporative Emission Purge Solenoid Valve

• If a click cannot be heard or felt

  Refer to: Circuit/System Testing

• If a click can be heard or felt
4. Verify the scan tool parameter:
• EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status=Not RunorOK
• EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status=Not RunorOK
• EVAP Purge Solenoid Valve Control Circuit Open Test Status=Not RunorOK
• Perform the action while monitoring the parameter:
• Wiggle the harness and connector(s):Q12 Evaporative Emission Purge Solenoid Valve
• Wiggle the harness and connector(s):K20 Engine Control Module
• If not the specified state

  Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)

• If the specified state
5. 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.

   Verify the DTC does not set.

• If the DTC sets

  Refer to: Circuit/System Testing

• If the DTC is not set
6. All OK.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:Q12 Evaporative Emission Purge Solenoid Valve
3. Ignition » On / Vehicle » In Service Mode
4. Verify a test lamp turns On between the test points:Ignition circuit terminal 1/A&Ground
• If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Test for less than 2 Ω between the test points:Ignition circuit terminal 1/A&Output terminal@Fuse
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse.
• If the test lamp does not turn On and the circuit fuse is open
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Connect the electrical connector:Q12 Evaporative Emission Purge Solenoid Valve
3. Ignition » On / Vehicle » In Service Mode
4. Replace the component:Fuse
5. Verify the fuse does not open.
• If the fuse opens and there are components connected to the circuit » Disconnect a component and repeat procedure starting at step 4.4
• If the fuse opens with all components disconnected from the circuit » Repair the short to ground on the circuit.
• If the fuse does not open after disconnecting a component from the circuit » Replace the component disconnected last.
• If the fuse does not open with all components connected.

Note: It may be necessary to use a scan tool control function to operate a component.

6. Operate the component:Each component on the circuit—One at a time

Verify the fuse does not open when any of the components are activated.

• If the fuse opens » Replace the component that caused the fuse to open when activated.
• If the fuse does not open.
7. All OK.
• If the test lamp turns On
5. Verify a test lamp does not turn On between the test points:Control circuit terminal 2/B&B+
• If the test lamp turns On
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Test for infinite resistance between the test points:Control circuit terminal 2/B@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:K20 Engine Control Module
• If the test lamp does not turn On
6. Remove » Test Lamp
7. Perform the scan tool control function:EVAP Purge Solenoid Valve»From 0 to 50% and back to 0%.

   Verify the scan tool parameter:EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status=OK

• If not the specified state
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:Control circuit terminal 2/B@Component harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K20 Engine Control Module
• If the specified state
8. Connect a 3 A fused jumper wire between the test points:Control circuit terminal 2/B&Ignition circuit terminal 1/A
9. Perform the scan tool control function:EVAP Purge Solenoid Valve»From 0 to 50% and back to 0%.

   Verify the scan tool parameter:EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status=Malfunction

• If not the specified state
1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Test for less than 2 Ω between the test points:Control circuit terminal 2/B@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If the specified state
10. Test or replace the component:Q12 Evaporative Emission Purge Solenoid Valve

1. Ignition/Vehicle » Off
2. Disconnect the electrical connector:Q12 Evaporative Emission Purge Solenoid Valve
3. Test for 10 to 30 Ω between the test points:Control terminal 2/B&Ignition terminal 1/A
• If not between 10 and 30 Ω

  Replace the component:Q12 Evaporative Emission Purge Solenoid Valve

• If between 10 and 30 Ω
4. All OK.

1. Ignition/Vehicle » Off
2. Disconnect the electrical connector:Q12 Evaporative Emission Purge Solenoid Valve
3. Connect a 3 A fused jumper wire between the test points:Ignition terminal 1/A&12 V

Caution: Complete the testing as quickly as possible in order to prevent overheating and damaging the component.

4. Momentarily connect a jumper wire between the test points:Control terminal 2/B&Ground

   Verify the component turns On and Off when connecting and disconnecting the jumper wire:Q12 Evaporative Emission Purge Solenoid Valve

• If the component does not turn On and Off

  Replace the component:Q12 Evaporative Emission Purge Solenoid Valve

• If the component turns On and Off
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Evaporative Emission Canister Purge Solenoid Valve Replacement
• For control module replacement, programming, and setup refer to:Control Module References