Conditions for Clearing the MIL/DTC
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
- 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 P2123
| 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 |
|
4.8 V | Go to Step 4 | Go to Step 3 |
| 3 |
|
- | Go to Step 4 | Go to Intermittent Conditions |
| 4 |
|
0 V | Go to Step 9 | Go to Step 5 |
| 5 | Measure the voltage from the 5-volt reference circuit of APP sensor 1 to a good ground with a DMM. Refer to Circuit Testing
in Wiring Systems. Does the DMM indicate voltage within the specified range? |
4.8-5.2 V | Go to Step 6 | Go to Step 7 |
| 6 | Measure the voltage from the 5-volt reference circuit to the low reference circuit of APP sensor 1 with a DMM. Refer to Circuit Testing
in Wiring Systems. Does the DMM indicate voltage within the specified range? |
4.8-5.2 V | Go to Step 15 | Go to Step 8 |
| 7 | Test the APP sensor 1 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 16 | Go to Step 10 |
| 8 | Test the APP sensor 1 low reference circuit for an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 12 |
| 9 | Test the APP sensor 1 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 16 | Go to Step 10 |
| 10 | Test for shorted terminals and for a poor connection at the APP 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 16 | Go to Step 11 |
| 11 | Test for shorted terminals and for a poor connection at the powertrain control module (PCM). 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 16 | Go to Step 14 |
| 12 | Test for an intermittent and for a poor connection at the APP 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 16 | Go to Step 13 |
| 13 | Test for an intermittent and for a poor connection at the PCM. 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 16 | Go to Step 14 |
| 14 | Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement
. Did you complete the replacement? |
- | Go to Step 16 | - |
| 15 | Replace the accelerator pedal assembly. Refer to Accelerator Pedal Position (APP) Sensor Replacement
. Did you complete the replacement? |
- | Go to Step 16 | - |
| 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 | System OK |