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DTC P0123 [L3 Turbo]

id0102b7804300

DTC P0123 | TP sensor No.1 circuit high input
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DETECTION CONDITION | • If the PCM detects that the TP sensor No.1 voltage is above 4.9 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 during first drive cycle. • FREEZE FRAME DATA is available. • DTCs are stored in the PCM memory.
POSSIBLE CAUSE | • TP sensor malfunction • Connector or terminal malfunction • Open circuit between throttle body terminal B and PCM terminal 3P • Open circuit between throttle body terminal D and PCM terminal 3Q • Short to the constant voltage supply circuit between throttle body terminal A and PCM terminal 3M

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 DATA 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 CONNECTOR • Turn the ignition switch off. • Verify that the throttle body connector is connected securely. • Is connector normal? | Yes | Go to the next step.
No | Connect the connector securely, then go to Step 10.
4 | INSPECT THROTTLE BODY CONNECTION FOR POOR CONNECTION • Disconnect throttle body connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the suspected wiring terminal, then go to Step 10.
No | Go to the next step.
5 | INSPECT TP SENSOR • Perform the TP sensor inspection. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L3 Turbo].) • Is the TP sensor normal? | Yes | Go to the next step.
No | Replace the throttle body, then go to Step 10.
6 | INSPECT TP1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn ignition switch to the ON position (Engine off). • Measure the voltage between throttle body terminal A (harness-side) and body ground. • Is the voltage above 4.9 V? | Yes | Repair or replace for short to a power supply. Then, go to Step 10.
No | Go to the next step.
7 | VERIFY TP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between throttle body connector terminal B (harness-side) and PCM connector terminal 3P. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace for an open circuit between TP sensor connector terminal B (harness-side) and PCM connector terminal 3P (harness-side). Then, go to Step 10.
8 | 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 terminal, then go to Step 10.
No | Go to Step 10.
9 | VERIFY TP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT • Inspect for continuity between throttle body terminals A and B (harness-side). • Is there continuity? | Yes | Repair or replace the suspected wiring harness, then go to the next step.
No | Go to the next step.
10 | VERIFY TROUBLESHOOTING OF DTC P0123 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn 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 same DTC present? | Yes | Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3 Turbo].)
No | Go to the next step.
11 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3 Turbo].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L3 Turbo].)
No | Troubleshooting completed.