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DTC P0123 [L8, LF, L3]

id0102a1804300

DTC P0123 | TP sensor No.1 circuit high input
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DETECTION CONDITION | • If the PCM detects the TP sensor No.1 voltage is to be above 4.85 V after ignition switch to the ON position, PCM determines that TP circuit has a 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 D and PCM terminal 2AP • Open circuit in wiring harness between TP sensor terminal A and PCM terminal 2AK • Short to constant voltage supply circuit in wiring harness between TP sensor terminal A and PCM terminal 2AK • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT THROTTLE BODY CONNECTION FOR POOR CONNECTION • Disconnect the throttle body 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 9.
No | Go to the next step.
4 | INSPECT TP SENSOR • Inspect the TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L8, LF, L3]) • Is the TP sensor okay? | Yes | Go to the next step.
No | Replace the throttle body, then go to Step 9.
5 | INSPECT TP1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between throttle body terminal A (wiring harness-side) and body ground. • Is the voltage above 4.9 V? | Yes | Repair or replace for a short to power supply. Then, go to Step 9.
No | Go to the next step.
6 | VERIFY TP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT • Inspect for continuity between throttle body terminals A and B (wiring harness-side). • Is there continuity? | Yes | Repair or replace suspected wiring harness, then go to Step 9.
No | Go to the next step.
7 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair the terminal, then go to Step 9.
No | Go to the next step.
8 | VERIFY TP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between throttle body connector terminal D (wiring harness-side) and PCM connector terminal 2AP (wiring harness-side). • Is there continuity? | Yes | Repair or replace for an open circuit between TP sensor connector terminal D (wiring harness-side) and PCM connector terminal 2AP (wiring harness-side). Then, go to the step.
No | Go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0123 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn the ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine and warm it up completely. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.