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.

2: If DTC P0651 set, the 5-volt reference circuit may be shorted to a voltage.
12: After replacing the PCM, a new minimum throttle position and idle speed must also be established.

DTC P0453

Step	Action	Values	Yes	No
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Start the engine, and let idle for 10 seconds. Monitor the diagnostic trouble codes (DTC) information using the scan tool. Is DTC P0651 also set?	-	Go to DTC P0651	Go to Step 3
3	Turn the ignition switch OFF. Remove the fuel fill cap. Turn the ignition ON, with the engine OFF. Observe the fuel tank pressure (FTP) sensor voltage with a scan tool. Does the scan tool indicate that the FTP sensor voltage is more than the specified value?	4.2 V	Go to Step 5	Go to Step 4
4	Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition?	-	Go to Step 5	Go to Intermittent Conditions
5	Turn OFF the ignition. Disconnect the FTP sensor harness connector. Turn ON the ignition, with the engine OFF. With a scan tool, observe the FTP sensor. Does the scan tool indicate that the FTP sensor voltage is greater than the specified value?	4.2 V	Go to Step 6	Go to Step 7
6	Test the FTP signal circuit for a short to voltage or a short to a 5-volt reference circuit. Refer to Testing for a Short to Voltage and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 13	Go to Step 12
7	Probe the low reference circuit of the FTP sensor with a test lamp connected to battery voltage. Refer to Troubleshooting with a Test Lamp . Did the test lamp illuminate?	-	Go to Step 9	Go to Step 8
8	Test the low reference circuit of the FTP sensor for an open. Refer to Testing for Continuity and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 13	Go to Step 10
9	Inspect for poor connections at the harness connector of the FTP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 13	Go to Step 11
10	Inspect for poor connections at the harness connector of 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 13	Go to Step 12
11	Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement . Did you complete the replacement?	-	Go to Step 13	-
12	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 13	-
13	Use the scan tool in order to clear the DTCs. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC run and pass?	-	Go to Step 14	Go to Step 2
14	With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK