Test Description
WARNING: This page is about a different car, the 2007 Chevrolet Cobalt. 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: This step determines if the condition is present.
- 4: This step tests the signal circuit of the FTP sensor.
- 5: This step tests the ground circuit of the FTP sensor.
- 6: This step tests the 5-volt reference circuit of the FTP sensor.
DTC P0453
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics 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 |
|
4.3 V | Go to Step 4 | Go to Step 3 |
| 3 |
|
- | Go to Step 4 | Go to Intermittent Conditions |
| 4 |
|
0.2 V | Go to Step 7 | Go to Step 5 |
| 5 | Probe the low reference circuit of the FTP sensor with a test lamp that is connected to battery voltage. Refer to Probing Electrical Connectors
. Does the test lamp illuminate? |
- | Go to Step 6 | Go to Step 8 |
| 6 | Measure the voltage of the FTP 5-volt reference circuit with a DMM. Refer to Circuit Testing
. Does the FTP 5-volt reference measure within the specified value? |
4.8-5.2 V | Go to Step 10 | Go to Step 11 |
| 7 | Test the FTP signal circuit for a short to voltage or for a short to a 5-volt reference circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 14 | Go to Step 13 |
| 8 | Test the FTP low reference circuit for an open. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 14 | Go to Step 9 |
| 9 | 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 14 | Go to Step 13 |
| 10 | 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 14 | Go to Step 12 |
| 11 | Repair the short to voltage in the FTP 5-volt reference circuit. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 14 | - |
| 12 | Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement
. Did you complete the replacement? |
- | Go to Step 14 | - |
| 13 | Replace the powertrain control module (PCM). Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 14 | - |
| 14 |
|
- | Go to Step 2 | Go to Step 15 |
| 15 | 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 |