Conditions for Clearing the MIL/DTC
- 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 P0123
| 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 - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
4.67 V | Go to Step 4 | Go to Step 3 |
| 3 |
|
- | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections |
| 4 |
|
4.8-5.2 V | Go to Step 5 | Go to Step 7 |
| 5 | Measure the voltage from the 5-volt reference circuit to the low reference circuit of TP sensor 1 with a DMM. Refer to Circuit Testing
. Does the DMM indicate voltage within the specified range? |
4.8-5.2 V | Go to Step 6 | Go to Step 8 |
| 6 | Measure the voltage from the TP sensor 1 signal circuit to a good ground with a DMM. Does the DMM indicate that the voltage is more than the specified value? |
0.2 V | Go to Step 9 | Go to Step 15 |
| 7 | Test the TP sensor 1 5-volt reference circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 10 |
| 8 | Test the TP sensor 1 low reference circuit for an open. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 12 |
| 9 | Test the TP sensor 1 signal circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
. 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 throttle body. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. 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
. 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 throttle body. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. 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
. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 14 |
| 14 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 16 | - |
| 15 | Replace the throttle body assembly. Refer to Throttle Body Assembly 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 - Vehicle | System OK |