Code No. P2122: Accelerator pedal position sensor (main) low input
Code No. P2123: Accelerator pedal position sensor (main) high input


ACCELERATOR PEDAL POSITION SENSOR CIRCUIT






OPERATION



  • The accelerator pedal position sensor (main) is supplied with the 5-V power from the EV-ECU, converts the accelerator pedal position sensor opening into the voltage, and outputs it to the EV-ECU.

DIAGNOSIS CODE SET CONDITIONS



  • If the accelerator pedal position sensor (main) output voltage of 0.2 V or less continues, the diagnosis code No. P2122 will be set.
  • If the accelerator pedal position sensor (main) output voltage of 4.8 V or more continues, the diagnosis code No. P2123 will be set.

PROBABLE CAUSES



  • Damaged wiring harness or connector(s)
  • Malfunction of the accelerator pedal position sensor (main)
  • Malfunction of the EV-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the service data for the accelerator pedal position sensor (main). (Refer to .)
Data list
  • Item No. 75 : Accelerator sensor 1 power supply voltage

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
Go to Step 2.

STEP 2. Measure the voltage at B-115 accelerator pedal position sensor (main) connector.
(1)Disconnect the B-115 accelerator pedal position sensor (main) connector, and measure the voltage at the wiring harness side.
(2)Turn the electric motor switch to the "ON" position.
(3)Measure the voltage between the B-115 accelerator pedal position sensor (main) connector terminal No. 1 and the body earth.
OK: 4.9 to 5.1 V

Q. Is the check result normal?
Go to Step 5.
Go to Step 3.

STEP 3. Connector check: B-115 accelerator pedal position sensor (main) connector, C-108 EV-ECU connector

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

STEP 4. Check the wiring harness between C-108 EV-ECU connector terminal No. 42 and B-115 accelerator pedal position sensor (main) connector terminal No. 1.
Check the power supply line for open circuit.

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

STEP 5. Check the wiring harness between C-108 EV-ECU connector terminal No. 48, 59 and B-115 accelerator pedal position sensor (main) connector terminal No. 2, 3.
Check the signal lines for open circuit and short circuit.

Q. Is the check result normal?
Replace the accelerator pedal. (Refer to GROUP 17 - Accelerator Pedal Removal and Installation .) Then go to Step 6.
Repair the wiring harness.

STEP 6. Diagnosis code recheck
Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?
Replace the EV-ECU. (Refer to .) Then go to Step 7.
The diagnosis is complete.

STEP 7. Diagnosis code recheck
Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?
Return to Step 1.
The diagnosis is complete.