Test Description

The numbers below refer to the step numbers on the diagnostic table.

2: This step determines if a condition exists. The EVAP canister purge valve is PWM. An audible click should be heard when the EVAP canister purge valve is commanded ON. Repeat the command as necessary.
5: This step tests the feedback voltage from the ECM. If a voltage is not available, this indicates an internal ECM condition.
6: This step tests the ignition 1 voltage circuit to the EVAP canister purge valve.

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connect End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check - Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Turn ON the ignition, with the engine OFF. Command the evaporative emission (EVAP) canister purge valve ON with a scan tool. Do you hear an audible click from the EVAP canister purge valve?	-	Go to Step 4	Go to Step 3
3	Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. Did the DTC fail this ignition?	-	Go to Step 4	Go to Diagnostic Aids
4	Turn OFF the ignition. Disconnect the evaporative emission (EVAP) canister purge valve. Turn ON the ignition, with the engine OFF. Connect a test lamp between the ignition 1 voltage circuit of the EVAP canister purge valve and the control circuit of the EVAP canister purge valve. Command the EVAP canister purge valve ON with a scan tool. Does the test lamp illuminate or flash?	-	Go to Step 5	Go to Step 6
5	Measure the voltage from the control circuit of the EVAP canister purge valve to a good ground with a DMM. Is the voltage within the specified range?	3.6 - 4.2 V	Go to Step 8	Go to Step 9
6	Connect a test lamp between the ignition 1 voltage circuit of the EVAP canister purge valve to a good ground. Does the test lamp illuminate?	-	Go to Step 7	Go to Step 10
7	Turn OFF the ignition. Disconnect the ECM. Test the control circuit of the EVAP canister purge valve for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 9
8	Test for an intermittent and for a poor connection at the EVAP canister purge valve. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 11
9	Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 12
10	IMPORTANT: The ignition 1 voltage circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition 1 voltage circuit. Repair the open, or short to ground in the ignition 1 voltage circuit of the EVAP canister purge valve. Refer to Wiring Repairs in Wiring Systems. Replace the fuse if necessary. Did you complete the repair?	-	Go to Step 13	-
11	Replace the EVAP canister purge valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement . Did you complete the replacement?	-	Go to Step 13	-
12	Replace the ECM. Refer to Engine Control Module Replacement . Did you complete the replacement?	-	Go to Step 13	-
13	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. Did the DTC fail this ignition?	-	Go to Step 2	Go to Step 14
14	Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List	System OK