Test Description
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: Engine Controls Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Engine Controls? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 |
|
4.8 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 | Measure the resistance between the low reference circuit of the FTP sensor and the engine control module (ECM) housing with a DMM. Is the resistance less than the specified value? |
2 Ω | Go to Step 6 | Go to Step 8 |
| 6 | Measure the voltage of the FTP 5-volt reference circuit with a DMM. Refer to Measuring Voltage
in Wiring Systems. Is the voltage within the specified range? |
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
in Wiring Systems. 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, or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. 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
in Wiring Systems. 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
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 14 | Go to Step 12 |
| 11 |
IMPORTANT:
The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnosis the applicable circuits and components. Repair the short to voltage in the 5-volt reference circuit of the FTP sensor. Refer to Repairing Damaged Wire Insulation
in Wiring Systems.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 control module. Refer to Engine Control Module (ECM) Replacement
. 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 | System OK |