Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- If DTC P0122 and P0530 are also set, a short to ground on the 5-volt reference circuit may exist.
- If DTC P0641 is set, diagnose that DTC first.
- To locate an intermittent problem, use the scan tool to monitor FTP sensor voltage with the ignition ON, the engine OFF. Wiggling wires while watching for a change in FTP sensor voltage may locate the area where an open or short to ground in the wiring could lie.
- The signal voltage with the fuel cap OFF should read between 1.30-1.70 volts, which represents atmospheric pressure, or 0 inches of vacuum.
DTC P0452
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | Observe the Fuel Tank Pressure Sensor parameter with a scan tool. Is the Fuel Tank Pressure Sensor parameter less than the specified value? |
0.1 V | Go to Step 4 | Go to Step 3 |
| 3 |
|
- | Go to Step 4 | Go to Diagnostic Aids |
| 4 |
|
4.8-5.2 V | Go to Step 6 | Go to Step 5 |
| 5 | Disconnect the following components, while monitoring the DMM:
Is the DMM within the specified value when any of the components are disconnected? |
4.8-5.2 V | Go to Step 11 | Go to Step 7 |
| 6 |
|
0.15-0.20 V | Go to Step 9 | Go to Step 8 |
| 7 | Test the FTP 5-volt reference circuit for an open or for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 14 | Go to Step 10 |
| 8 | Test the FTP signal circuit for an open or for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 14 | 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 14 | Go to Step 12 |
| 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 14 | Go to Step 13 |
| 11 | Replace the component that affected the 5-volt reference circuit. Refer to Throttle Body Assembly Replacement
or Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement
. Did you complete the replacement? |
- | 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 engine control module (ECM). 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 |