DTC P0123 [LF, L3]

id0102008043a3

DTC P0123

TP circuit high input

DETECTION CONDITION

• If the PCM detects that the TP sensor voltage at PCM terminal 2A is above 4.9 V after 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).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• The PENDING CODE is available if the PCM detects the above malfunction condition.
• The FREEZE FRAME DATA is available.
• The 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 the constant voltage supply circuit between TP sensor terminal B and PCM terminal 2A

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the 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 to the OFF position.
• Verify that the TP sensor connector is connected securely.
• Is the connector normal?
Yes
Go to the next step.
No
Connect the connector securely, then go to Step 9.
3
INSPECT TP TPSENSOR FOR POOR CONNECTION
• Disconnect TP sensor connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace the suspected 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 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 terminal B and body ground.
• Is the voltage above 4.9?
Yes
Repair or replace for a short to the power circuit. Then, go to Step 9.
No
Go to the next step.
6
VERIFY TP SENSOR GROUND CIRCUIT for an open circuit CIRCUIT
• Inspect the continuity between TP sensor connector terminal A and body ground.
• Is there continuity?
Yes
Repair or replace for an open circuit between TP sensor connector terminal A (harness-side) and PCM connector terminal 2H (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 the next step.
8
VERIFY TP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT
• Inspect for continuity between TP sensor connector terminals B and C.
• Is there continuity?
Yes
Repair or replace the suspected 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 the 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 the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.