Code No. P1B1B Brake pedal stroke sensor power circuit


BRAKE PEDAL STROKE SENSOR CIRCUIT






OPERATION
The brake pedal stroke sensor is supplied with the 5-V power from the EV-ECU.

DIAGNOSIS CODE SET CONDITIONS

  • If the brake pedal stroke sensor power supply voltage of 4.7 V or less or 5.3 V or higher continues, the diagnosis code No. P1B1B will be set.

PROBABLE CAUSES

  • Wiring harness or connector fail
  • Brake pedal stroke sensor malfunction
  • EV-ECU malfunction

DIAGNOSTIC PROCEDURE

STEP 1. Voltage measurement at the B-121 brake pedal stroke sensor connector
(1)Disconnect the B-121 brake pedal stroke sensor connector, and then measure the voltage at the harness connector side.
(2)Turn the electric motor switch to the "ON" position.
(3)Measure the voltage between the B-121 brake pedal stroke sensor terminal No.1 and the body earth.
OK: 4.9 to 5.1 V

Q. Is the check result normal?
Go to Step 4
Go to Step 2

STEP 2. Connector check: B-121 brake pedal stroke sensor connector, C-108 EV-ECU connector

Q. Is the check result normal?
Go to Step 3
Repair the defective connector.

STEP 3. Wiring harness check between C-108 EV-ECU connector terminal No.43 and B-121 brake pedal stroke sensor connector terminal No.1.
Check for open circuit in power circuit.

Q. Is the check result normal?
Go to Step 4
Repair the wiring harness.

STEP 4. M.U.T.-III data list
Check the following data list (Refer to ).

  • Item 86: Brake pedal stroke sensor power supply

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
Go to Step 5.

STEP 5. Check whether the diagnosis code is reset
Recheck if the diagnosis code is set .
(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?
Replace the brake pedal assembly (Refer to GROUP 35A - Brake Pedal <LHD>, <RHD>). Then go to Step 6.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 6. Check whether the diagnosis code is reset
Recheck if the diagnosis code is set .
(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "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. Check whether the diagnosis code is reset
Recheck if the diagnosis code is set .
(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.
(3)Check if the diagnosis code is set.

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