Test Description
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic table.
- 2: This step determines if a communication condition exists.
- 5: This step isolates an internal APP sensor failure. The condition may only occur at a certain accelerator pedal position. Monitoring the APP angles for sensor 1 and sensor 2 is an accurate way of verifying the actual position of the pedal. The APP angles for all 3 sensors should be within a few percent of each other. When the pedal is at rest, the APP angle for all 3 sensors should be 0 percent. When the pedal is fully depressed, all APP angles should be 100 percent.
- 6: The APP sensor 3 has a dedicated 5-volt reference circuit. Monitoring the APP sensor 1 voltage aids in diagnosing the APP sensor 3 5-volt reference circuit. If the scan tool displays 5 volts then the circuits are OK.
- 25: When the TAC module detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests that run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Keep this in mind when reviewing the Capture Info.
DTC P2131
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module (PCM) Connector End Views ,, or 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 | Is DTC U0107 also set? | - | Go to DTC U0107 | Go to Step 3 |
| 3 |
IMPORTANT:
Do not depress the accelerator pedal.
|
- | Go to Diagnostic Trouble Code (DTC) List | Go to Step 4 |
| 4 | Observe the APP sensor Agree/Disagree parameters, with a scan tool. Does the scan tool indicate Disagree for any of the APP sensor Agree/Disagree parameters? |
- | Go to Step 6 | Go to Step 5 |
| 5 |
|
- | Go to Diagnostic Aids | Go to Step 6 |
| 6 |
|
3.94-6.06 V | Go to Step 7 | Go to Step 14 |
| 7 | Test the APP sensor 3 signal circuit for voltage, with a DMM. Does the DMM indicate voltage within the specified values? |
3.94-6.06 V | Go to Step 8 | Go to Step 16 |
| 8 | Measure the resistance between the APP sensor 3 low reference circuit and the APP sensor 1 low reference circuit, with a DMM. Does the DMM indicate resistance within the specified values? |
0-5 ohm | Go to Step 9 | Go to Step 19 |
| 9 |
|
- | Go to Step 24 | Go to Step 10 |
| 10 | Test for a short between the APP sensor 3 5-volt reference circuit and all other APP circuits at the APP sensor harness connector. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 11 |
| 11 | Test the APP sensor 3 signal 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 24 | Go to Step 12 |
| 12 | Test for a short between the APP sensor 3 signal circuit and all other APP circuits at the APP sensor harness connector. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 13 |
| 13 | Test the APP sensor 3 low reference circuit for resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 20 |
| 14 |
|
- | Go to Step 24 | Go to Step 15 |
| 15 | Test the APP sensor 3 5-volt reference circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 21 |
| 16 |
|
- | Go to Step 24 | Go to Step 17 |
| 17 | Test the APP sensor 3 signal circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 18 |
| 18 | Test for a short between the APP sensor 3 signal circuit and all other APP circuits at the APP sensor harness connector. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 19 |
| 19 |
|
- | Go to Step 24 | Go to Step 21 |
| 20 | Inspect for poor connections at the harness connector of the APP sensor. Refer to Testing for Intermittent Conditions and Poor Connections
and Repairing Connector Terminals
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 22 |
| 21 | Inspect for poor connections at the harness connectors of the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections
and Repairing Connector Terminals
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 23 |
| 22 | Replace the APP sensor assembly. Refer to Accelerator Pedal Position (APP) Sensor Replacement
. Did you complete the replacement? |
- | Go to Step 24 | - |
| 23 | Replace the TAC module. Refer to Throttle Actuator Control (TAC) Module Replacement
. Did you complete the replacement? |
- | Go to Step 24 | - |
| 24 |
|
- | Go to Step 2 | Go to Step 25 |
| 25 | 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 |