Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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

1: The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
11: After replacing the PCM, a new minimum throttle position and idle speed must also be established.

DTC P0498

Step	Action	Yes	No
Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn ON the ignition, with the engine OFF. Command the evaporative emission (EVAP) vent valve ON and OFF with a scan tool. Do you hear or feel a click from the EVAP vent valve when the valve is commanded ON and OFF?	Go to Step 3	Go to Step 4
3	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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. Did the DTC fail this ignition?	Go to Step 4	Go to Intermittent Conditions
4	Turn OFF the ignition. Disconnect the EVAP vent valve. Turn ON the ignition, with the engine OFF. Probe the battery positive voltage circuit of the EVAP vent valve with a test lamp connected to a good ground. Does the test lamp illuminate?	Go to Step 5	Go to Step 9
5	Connect a test lamp between the battery positive voltage circuit and the control circuit of the EVAP vent valve. Command the EVAP vent valve ON with a scan tool. Does the test lamp illuminate?	Go to Step 7	Go to Step 6
6	Test the control circuit of the EVAP vent valve for an open or for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition?	Go to Step 12	Go to Step 8
7	Test for an intermittent and for a poor connection at the EVAP vent valve. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 12	Go to Step 10
8	Test for an intermittent and for a poor connection at the control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 12	Go to Step 11
9	Repair the battery positive voltage circuit of the EVAP vent valve for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs . Replace the fuse as necessary. Did you complete the repair?	Go to Step 12	-
10	Replace the EVAP vent valve. Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement . Did you complete the replacement?	Go to Step 12	-
11	Replace the powertrain control module (PCM). Refer to Control Module References for replacement, setup, and programming. Perform the idle learn procedure. Refer to Idle Learn . Did you complete the replacement?	Go to Step 12	-
12	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. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	Go to Step 2	Go to Step 13
13	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK