DTC P0123 [L3]

BME010200100W13

DTC P0123

TP circuit high input

DETECTION CONDITION

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