Test Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The number below refers to the step number on the diagnostic table.
- 2: If DTC P0641 set, the 5-volt reference circuit may be shorted to a voltage.
DTC P0453
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics (LX9) Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module (PCM) Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
- | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 3 |
| 3 |
|
4.1 V | Go to Step 5 | Go to Step 4 |
| 4 |
|
- | Go to Step 5 | Go to Testing for Intermittent Conditions and Poor Connections |
| 5 |
|
4.1 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 that is connected to battery voltage. Refer to Troubleshooting with a Test Lamp
. Does 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 | Test for an intermittent and for a poor connection at 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 | 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 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. Did you complete the replacement? |
- | Go to Step 13 | - |
| 13 |
|
- | Go to Step 2 | Go to Step 14 |
| 14 | 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 |