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DTC P0121 [MZR-CD (RF Turbo)]

BME010200100W30

DTC P0121 | Accelerator position sensor No.1 circuit performance problem
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DETECTION CONDITION | • PCM monitors input voltage from accelerator position sensor No.1 while engine is running. If input voltage from accelerator position sensor No.1 is above 1.3 V when accelerator pedal is depressed, PCM determines accelerator position sensor No.1 circuit performance problem.
POSSIBLE CAUSE | • Accelerator position sensor No.1 malfunction • Connector or terminal malfunction • Voltage drops in GND circuit • Accelerator position sensor misadjustment • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to next step.
No | Go to next step.
2 | INSPECT POOR CONNECTION OF ACCELERATOR POSITION SENSOR NO.1 CONNECTOR • Turn engine switch to OFF. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace suspected terminal, go to Step 6.
No | Go to next step.
3 | INSPECT ACCELERATOR POSITION SENSOR NO.1 GND CIRCUIT FOR VOLTAGE DROP • Turn engine switch to OFF. • Inspect resistance between accelerator position sensor terminal D and body GND. • Is resistance approx. 0 ohm? | Yes | Go to next step.
No | Repair or replace suspected terminal, go to Step 6.
4 | INSPECT ACCELERATOR POSITION SENSOR NO.1 • Inspect accelerator position sensor No.1. (See ACCELERATOR POSITION SENSOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction? | Yes | Adjust or replace accelerator position sensor, go to Step 6. (See ACCELERATOR POSITION SENSOR ADJUSTMENT [MZR-CD (RF Turbo)].) (See ACCELERATOR PEDAL COMPONENT DISASSEMBLY/ASSEMBLY [MZR-CD (RF Turbo)].)
No | Go to next step.
5 | INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn engine switch to OFF. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace suspected terminal, go to next step.
No | Go to next step.
6 | VERIFY TROUBLESHOOTING OF DTC P0121 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from PCM memory using WDS or equivalent. • Start engine. • Is same DTC present? | Yes | Replace PCM, go to next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Is there any DTC present? | Yes | Go to applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.