Code No. P1AA8: Local CAN (for drive battery) Signal Time-out




TROUBLE JUDGEMENT


Check Condition
  • The power supply mode of the electric motor switch is ON, or the drive battery starts to be charged.
Judgement Criterion
  • One of the CMU signals cannot be received through the CAN communication.

FAIL-SAFE AND BACKUP FUNCTION



  • Not available

PROBABLE CAUSES



  • The Local CAN (for drive battery) bus is failed.
  • The CMU is failed.
  • The BMU is failed.

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code.



  • Are the following diagnosis codes stored?

  1. U11A0: CMU01 time-out
  2. U11A1: CMU02 time-out
  3. U11A2: CMU03 time-out
  4. U11A3: CMU04 time-out
  5. U11A4: CMU05 time-out
  6. U11A6: CMU07 time-out
  7. U11A7: CMU08 time-out
  8. U11A8: CMU09 time-out
  9. U11A9: CMU10 time-out
  10. U11AA: CMU11 time-out

Q. Are the diagnosis code stored?

Check code No. U11A0 - U11AA: CMU time-out (Refer to ).
Go to Step 2.

STEP 2. Check of short to earth, short to power supply, open circuit and damage in CNBL line between BMU connector and drive battery connector.


Q. Is the check result normal?

Go to Step 3.
Repair the connector(s) or wiring harness.

STEP 3. Check of short to earth, short to power supply, open circuit and damage in CNBH line between BMU connector and drive battery connector.


Q. Is the check result normal?

Go to Step 4.
Repair the connector(s) or wiring harness.

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



  • Check all the data list of the CMU.
  • CMU Data List Reference Table (Refer to .)

  1. Item 22: Cell monitor IC 1
  2. Item 23: Cell monitor IC 2
  3. Item 24: Cell monitor IC 3
  4. Item 25: Cell monitor IC 4
  5. Item 26: Cell monitor IC 5
  6. Item 27: Cell monitor IC 6
  7. Item 28: Voltage sensor
  8. Item 29: Microcomputer reference voltage
  9. Item 30: IC reference voltage
  10. Item 79: EEPROM Fail (numbering data read
  11. Item 80: EEPROM Fail (learning data read)
  12. Item 81: CAN controller
  13. Item 88: A/D conversion (reference voltage)
  14. Item 89: A/D conversion (temperature sensor 1)
  15. Item 90: A/D conversion (temperature sensor 2)
  16. Item 91: A/D conversion (temperature sensor 3)
  17. Item 92: A/D conversion (temperature sensor 4)
  18. Item 93: A/D conversion (temperature sensor 5)
  19. Item 95: A/D conversion (module voltage)
  20. Item 98: Bat-CAN (bus off)

Q. Are the check result normal?

Go to Step 5.
Remove the battery tray cover (Refer to ). Replace the CMU where the CMU ID is not numbered. Then, assemble the drive battery assembly (Refer to ).

STEP 5. Check the local CAN (for drive battery) terminating resistance itself



  • Check the local CAN (for drive battery) terminating resistance itself (Refer to ).

Q. Is the check result normal?

Go to Step 6.
Remove the battery tray cover (Refer to M1549401300129). Then, go to Step 7.

STEP 6. Check the local CAN (for drive battery) terminating resistance itself


(1)Disconnect the connector, and measure at the equipment side.
(2)Check the resistance between the BMU connector CANL terminal and CANH terminal.
OK: 100 - 140 Ω

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the BMU.

STEP 7. Check of short to earth, short to power supply, open circuit and damage in CANL line between drive battery connector and CMU ID01, CMU ID02, CMU ID03, CMU ID04, CMU ID05, CMU ID07, CMU ID08, CMU ID09, CMU ID10, CMU ID11 connector.


Q. Is the check result normal?

Go to Step 8.
Repair the connector(s) or wiring harness.

STEP 8. Check of short to earth, short to power supply, open circuit and damage in CANH line between drive battery connector and CMU ID01, CMU ID02, CMU ID03, CMU ID04, CMU ID05, CMU ID07, CMU ID08, CMU ID09, CMU ID10, CMU ID11 connector.


Q. Is the check result normal?

Go to Step 9.
Repair the connector(s) or wiring harness.

Check the local CAN (for drive battery) terminating resistance itself.



  • Check the local CAN (for drive battery) terminating resistance itself.

Q. Is the check result normal?

Repair CTR1 line and CTR2 line between drive battery connector and CMU ID07 connector
Replace the CMU ID07.