Code No. P1B1B: Brake pedal stroke sensor power supply circuit



caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.

TROUBLE JUDGEMENT


The PHEV-ECU stores diagnosis code No. P1B1B when the power supply voltage to the brake pedal stroke sensor is abnormal.

PROBABLE CAUSES



  • Malfunction of brake pedal stroke sensor
  • Damaged harness or connector
  • Malfunction of PHEV-ECU

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Check whether the diagnosis code is stored again.


Recheck if the diagnosis code is stored.
(1)Erase the diagnosis code.
(2)Turn on the power supply mode of the electric motor switch .
(3)Check if the diagnosis code is stored.

Q. Is the diagnosis code stored?

Go to Step 3.
The procedure is complete.

STEP 3. Check the signal line for open and short circuit. (brake pedal stroke sensor and the PHEV-ECU)



  • Check the wiring harness between brake pedal stroke sensor connector and the PHEV-ECU (BPP2 terminal) connector.

Q. Is the check result normal?

Go to Step 4.
Repair the connector or wiring harness.

STEP 4. M.U.T.-III data list


Check that the following data list display contents are normal. (Refer to ).
Data list
  • Item 86: Brake pedal stroke sensor power supply
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 6.
Go to Step 5.

STEP 5. Check brake pedal stroke sensor


Refer to GROUP 35A - Brake Pedal Stroke Sensor Check. .
caution
  • When the brake pedal assembly is replaced/adjusted or the brake pedal stroke sensor is replaced, execute the special function (PHEV-ECU) "Item No. 2: B/P stroke sensor learning reset" or disconnect the auxiliary battery terminals and then leave it disconnected for at least ten seconds.
  • Keep away the brake pedal stroke sensor from a magnetic device.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
Replace the brake pedal stroke sensor (Refer to GROUP 35A -Brake Pedal ). Then go to Step 6.

STEP 6. Check whether the diagnosis code is stored again.


Recheck if the diagnosis code is stored.
(1)Erase the diagnosis code.
(2)Turn on the power supply mode of the electric motor switch.
(3)Check if the diagnosis code is stored.

Q. Is the diagnosis code stored?

Replace the PHEV-ECU (Refer to ).
The procedure is complete.