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DTC P0123 [L3]

BME010200100235

DTC P0123 | TP circuit high input
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DETECTION CONDITION | • If the PCM detects the TP sensor voltage at PCM terminal 2A is above 4.9 V after the 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).
• 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
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [L3].) • Is same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
2 | 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 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 the terminal, then go to Step 9.
No | Go to the next step.
4 | INSPECT TP SENSOR • Perform the TP sensor inspection. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L3]) • Is the TP sensor normal? | Yes | Go to the next step.
No | Replace the 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 TP sensor terminal B (wiring harness-side) and body ground. • Is the voltage above 4.9 V? | Yes | Repair or replace the wiring harness for short to power supply, then go to step 9.
No | Go to the next step.
6 | VERIFY TP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect for 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 (wiring harness-side) and PCM connector terminal 2H (wiring 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 Step 9.
8 | VERIFY TP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT • Inspect for continuity between TP sensor connector terminals B and C (wiring harness-side). • Is there continuity? | Yes | Repair or replace the 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 KOEO/KOER self-test. (See KOEO/KOER SELF-TEST PROCEDURE [L3].)
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L3].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L3].)
No | Troubleshooting completed.