DTC P0123 [LF]

#
DTC P0123 [LF]

B3E010201084W17

DTC P0123 | TP sensor circuit high input
--- | ---

DETECTION CONDITION

• If the PCM detects the TP sensor voltage at PCM terminal 2I is above 4.9 V while the engine is running, the PCM determines that the TP circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if the PCM detects the above malfunction condition in first drive cycles.
• PENDING CODE is available if the 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 in wiring harness between TP sensor terminal A and PCM terminal 2AA • Short to constant voltage supply circuit in wiring harness between TP sensor terminal B and PCM terminal 2I

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | 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 11.
4 | INSPECT POOR CONNECTION OF TP SENSOR CONNECTOR • Disconnect the TP sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 11.
No | Go to the next step.
5 | INSPECT TP SENSOR • Perform TP sensor inspection. (See THROTTLE POSITION (TP) SENSOR INSPECTION [LF]) • Is TP sensor normal? | Yes | Go to the next step.
No | Replace the TP sensor, then go to Step 11.
6 | INSPECT TP SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • 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 V? | Yes | Repair or replace short to power supply. Then, go to Step 11.
No | Go to the next step.
7 | VERIFY TP SIGNAL CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between TP sensor terminal B (wiring harness-side) and PCM terminal 2I. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness, then go to Step 11.
8 | VERIFY TP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between TP sensor terminal A and body ground. • Is there continuity? | Yes | Repair or replace open circuit in wiring harness between TP sensor terminal A (wiring harness-side) and PCM terminal 2AA (wiring harness-side). Then, go to Step 11.
No | Go to the next step.
9 | INSPECT PCM CONNECTOR • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair terminal, then go to Step 11.
No | Go to Step 11.
10 | VERIFY TP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT • Inspect the continuity between TP sensor terminals B and C. • Is there continuity? | Yes | Repair or replace the wiring harness, then go to the next step.
No | Go to the next step.
11 | 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. • Start the engine. • Is same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [LF].)
No | Go to the next step.
12 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [LF].) • Are any DTC present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [LF].)
No | Troubleshooting completed.