Conditions for Clearing the MIL/DTC
WARNING: This page is about a different variant/trim than selected.
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
DTC P0451
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine 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 in Vehicle DTC Information |
| 2 |
|
- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 |
| 3 |
|
4.9-5.1 V | Go to Step 4 | Go to Step 6 |
| 4 |
|
4.9-5.1 V | Go to Step 5 | Go to Step 8 |
| 5 | Measure the voltage from the 5-volt reference circuit to the low reference circuit with a DMM. Is the voltage within the specified value? |
4.9-5.1 V | Go to Step 9 | Go to Step 7 |
| 6 | Test the 5-volt reference circuit for an open circuit or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 10 |
| 7 | Test the low reference circuit of the FTP sensor for an open or for high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 10 |
| 8 | Test the signal circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. 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
in Wiring Systems. 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
in Wiring Systems. 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 engine control module (ECM). Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 13 | - |
| 13 |
IMPORTANT:
DO NOT exceed the specified value in this step. Exceeding this specified value may produce incorrect test results.
|
5 in H2O | Go to Step 14 | Go to Step 2 |
| 14 | Observe the fuel tank pressure sensor parameter with a scan tool. Is the difference between the scan tool fuel tank pressure sensor parameter and the J 41413-200 gage within the specified value? |
1 in H2O | Go to Step 15 | Go to Step 2 |
| 15 |
|
- | Go to Step 16 | Go to Step 2 |
| 16 |
|
- | Go to Step 2 | Go to Step 17 |
| 17 | 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 in Vehicle DTC Information | System OK |