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DTC P2128 [L3 Turbo]

id0102b7812000

DTC P2128 | Accelerator pedal position (APP) sensor No.2 circuit high input
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DETECTION CONDITION | • The PCM monitors the APP sensor No.2 signal. If the PCM detects that the APP sensor No.2 voltage is above 4.5 V, the PCM determines that the APP sensor No.2 circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • MIL illuminates if the PCM detects the above malfunction condition during the 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 APP sensor terminal B and PCM terminal 2H • Open circuit between APP sensor terminal C and PCM terminal 2A • Short to constant voltage in the supply circuit between APP sensor terminal C and PCM terminal 2A

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 APP SENSOR CONNECTOR • Turn the ignition switch to off. • Verify that the APP sensor connector is connected securely. • Is the connector normal? | Yes | Go to the next step.
No | Connect the connector securely, then go to Step 10.
4 | INSPECT APP SENSOR CONNECTOR FOR POOR CONNECTION • Disconnect the APP sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the suspected terminal, then go to Step 10.
No | Go to the next step.
5 | INSPECT APP SENSOR • Perform the APP sensor inspection. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L3 Turbo].) • Is the APP sensor normal? | Yes | Go to the next step.
No | Replace the APP sensor, then go to Step 10.
6 | INSPECT APP2 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn ignition switch to the ON position (Engine off). • Measure the voltage between APP sensor terminal C (harness-side) and body ground. • Is the voltage above 4.5 V? | Yes | Repair or replace for a short to power supply. Then, go to Step 10.
No | Go to the next step.
7 | VERIFY APP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Disconnect the PCM connector. • Inspect the continuity between APP sensor terminal B (harness-side) and PCM terminal 2H (harness-side). • Is there continuity? | Yes | Repair or replace for an open circuit between APP sensor terminal C (harness-side) and PCM connector terminal 2A (harness-side). Then, go to Step 10.
No | Go to the next step.
8 | INSPECT PCM CONNECTOR FOR POOR CONNECTION • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair the terminal, then go to Step 10.
No | Go to the next step.
9 | VERIFY APP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT • Inspect the continuity between throttle body terminals A and C (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 P2128 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 the same DTC present? | Yes | Replace the 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.