Code No. P2138: Accelerator Pedal Position Sensor (Main and Sub) Range/Performance Problem






OPERATION



  • Refer to Code No. P2122: Accelerator Pedal Position Sensor (main) Circuit Low Input .
  • Refer to Code No. P2127: Accelerator Pedal Position Sensor (sub) Circuit Low Input .

FUNCTION



  • Engine-A/T-ECU checks the accelerator pedal position sensor output signal characteristics for abnormal conditions.

TROUBLE JUDGMENT


Check Conditions
  • Ignition switch is in "ON" position
  • Accelerator pedal position sensor (main) output voltage is 0.2 - 4.8 V.
  • Accelerator pedal position sensor (sub) output voltage is 0.2 - 4.8 V.
  • For 25 ms, the change in the output voltage of the accelerator pedal position sensor (sub) is 0.06 V or less.
Judgment Criterion
  • Difference is more than 0.3 V between accelerator pedal position sensor (sub) output voltage multiplied by 2 and accelerator pedal position sensor (main) output voltage.

PROBABLE CAUSES



  • Failed accelerator pedal position sensor
  • Harness damage in accelerator pedal position sensor circuit or loose connector contact
  • Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: D-202 accelerator pedal position sensor connector

Q. Is the check result normal?
Go to Step 2 .
Repair or replace the connector.

STEP 2. Perform resistance measurement at D-202 accelerator pedal position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 2 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 6 .
Go to Step 3 .

STEP 3. Connector check: D-217 engine-A/T-ECU connector

Q. Is the check result normal?
Go to Step 4 .
Repair or replace the connector.

STEP 4. Check harness between D-202 (terminal No. 2) accelerator pedal position sensor connector and D-217 (terminal No. 91) engine-A/T-ECU connector.

  • Check earthing line for damage.

Q. Is the check result normal?
Go to Step 5 .
Repair the damaged harness wire.

STEP 5. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?
Replace the engine-A/T-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 6. Perform resistance measurement at D-202 accelerator pedal position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 5 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 9 .
Go to Step 7 .

STEP 7. Connector check: D-217 engine-A/T-ECU connector

Q. Is the check result normal?
Go to Step 8 .
Repair or replace the connector.

STEP 8. Check harness between D-202 (terminal No. 5) accelerator pedal position sensor connector and D-217 (terminal No. 120) engine-A/T-ECU connector.

  • Check earthing line for damage.

Q. Is the check result normal?
Go to Step 5 .
Repair the damaged harness wire.

STEP 9. Connector check: D-217 engine-A/T-ECU connector

Q. Is the check result normal?
Go to Step 10 .
Repair or replace the connector.

STEP 10. Check harness between D-202 (terminal No. 1) accelerator pedal position sensor connector and D-217 (terminal No. 92) engine-A/T-ECU connector.

  • Check power supply line for damage.

Q. Is the check result normal?
Go to Step 11 .
Repair the damaged harness wire.

STEP 11. Check harness between D-202 (terminal No. 4) accelerator pedal position sensor connector and D-217 (terminal No. 102) engine-A/T-ECU connector.

  • Check power supply line for damage.

Q. Is the check result normal?
Go to Step 12 .
Repair the damaged harness wire.

STEP 12. Check harness between D-202 (terminal No. 3) accelerator pedal position sensor connector and D-217 (terminal No. 114) engine-A/T-ECU connector.

  • Check output line for damage.

Q. Is the check result normal?
Go to Step 13 .
Repair the damaged harness wire.

STEP 13. Check harness between D-202 (terminal No. 6) accelerator pedal position sensor connector and D-217 (terminal No. 107) engine-A/T-ECU connector.

  • Check output line for damage.

Q. Is the check result normal?
Go to Step 14 .
Repair the damaged harness wire.

STEP 14. Replace the accelerator pedal assembly.

  • After replacing the accelerator pedal assembly, re-check the trouble symptoms.

Q. Is the check result normal?
Check end.
Replace the engine-A/T-ECU.