DTC P0123 [L3]

BME010200100235

DTC P0123

TP circuit high input

DETECTION CONDITION

• If the PCM detects the TP sensor voltage at PCM terminal 2A is above 4.9 V after the ignition switch is turned to the ON position, the PCM determines that the TP circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition in first drive cycles.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• TP sensor malfunction
• Connector or terminal malfunction
• Open circuit between TP sensor terminal A and PCM terminal 2H
• Short to constant voltage supply circuit between TP sensor terminal B and PCM terminal 2A

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
• Is same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT TP SENSOR CONNECTOR
• Turn the ignition switch off.
• Verify that the TP sensor connector is connected securely.
• Is connector normal?
Yes
Go to the next step.
No
Connect the connector securely, then go to Step 9.
3
INSPECT POOR CONNECTION OF TP SENSOR CONNECTOR
• Disconnect TP sensor connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
4
INSPECT TP SENSOR
• Perform the TP sensor inspection.
• Is the TP sensor normal?
Yes
Go to the next step.
No
Replace the TP sensor, then go to Step 9.
5
INSPECT TP SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between TP sensor terminal B (wiring harness-side) and body ground.
• Is the voltage above 4.9 V?
Yes
Repair or replace the wiring harness for short to power supply, then go to step 9.
No
Go to the next step.
6
VERIFY TP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between TP sensor connector terminal A and body ground.
• Is there continuity?
Yes
Repair or replace open circuit between TP sensor connector terminal A (wiring harness-side) and PCM connector terminal 2H (wiring harness-side). Then, go to Step 9.
No
Go to the next step.
7
INSPECT PCM CONNECTOR
• Disconnect the PCM connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair the terminal, then go to Step 9.
No
Go to Step 9.
8
VERIFY TP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT
• Inspect for continuity between TP sensor connector terminals B and C (wiring harness-side).
• Is there continuity?
Yes
Repair or replace the wiring harness, then go to the next step.
No
Go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0123 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.