Code No. P1B45: Brake pedal stroke sensor (installation)



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 ).

TROUBLE JUDGEMENT


The PHEV-ECU stores diagnosis code No. P1B45 when the brake pedal stroke sensor is installed improperly (output voltage is not within a certain range).

PROBABLE CAUSES



  • Incorrect brake pedal height
  • The brake pedal stroke sensor is installed improperly.
  • Malfunction of stop lamp switch
  • Damaged harness or connector

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. Brake pedal height check


Proceed to GROUP 35A - On-vehicle Service "Brake Pedal Inspection" .
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.

Q. Is the check result normal?

Go to Step 4.
Repair. Then go to Step 7.

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


Check that the following data list display contents are normal. (Refer to ).
Data list
  • Item 85: Brake pedal stroke sensor voltage
OK: 0 - 5 V
Data list
  • Item 87: Brake pedal stroke sensor stroke value
OK: Changes in proportion to the depression stroke.
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?

Go to Step 5.
Reinstall the brake pedal stroke sensor. Then go to Step 7.

STEP 5. M.U.T.-III data list (ETACS-ECU)


Check that the following data list display contents are normal. (Refer to GROUP 54A - ETACS ).
Data list
  • Item 290: Stop lamp switch
Check condition
Normal condition
Brake pedal depressed
ON
Other than above
OFF

Q. Is the check result normal?

Go to Step 7.
Go to Step 6.

STEP 6. Diagnose the ETACS.


Proceed to GROUP 54A - ETACS troubleshooting, input signal procedure No. 12 "The stop lamp switch signal is not received" (Refer to ).

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
Repair the system according to the diagnosis procedure. Then go to Step 7.

STEP 7. 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?

Return to Step 1.
The procedure is complete.