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DTC P0123 [L3]

BME010200100W13

DTC P0123 | TP circuit high input
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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
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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 next step.
No | Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
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. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L3]) • 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. (See KOEO/KOER SELF-TEST PROCEDURE [L3].)
• Is same DTC present?
Yes
Replace PCM, then go to next step.
(See PCM REMOVAL/INSTALLATION [L3].)
No | Go to next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present? | Yes | Go to applicable DTC troubleshooting. (See DTC TABLE [L3].)
No | Troubleshooting completed.