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

TROUBLE JUDGMENT

Check Conditions

3 seconds elapse after the electric motor switch is turned ON, or 3 seconds elapse after the main battery starts to be charged.
Code No. U1082: Local CAN (for main battery) bus off is not set.

Judgement Criterion

One of the CMU signals cannot be received through the CAN communication.

FAIL-SAFE AND BACKUP FUNCTION

Drive the main battery cooling fan for 10 minutes after judging malfunctions.

PROBABLE CAUSES

The Local CAN (for main battery) bus is failed.
The BMU is failed.

DIAGNOSIS PROCEDURE

STEP 1. Check the local CAN (for main battery) terminating resistance itself

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

Q. Is the check result normal?

	Go to Step 2 .

	Replace the main battery.

STEP 2. Connector check: C-26 main battery connector, C-109 BMU connector

Q. Is the check result normal?

	Go to Step 3 .

	Repair.

STEP 3. Check harness between C-26 (terminal No. 10) main battery connector and C-109 (terminal No. 38) BMU connector.

Check signal line for open circuit, short circuit to earth, short circuit to power supply system and damage.

Q. Is the check result normal?

	Go to Step 4 .

	Repair.

STEP 4. Check harness between C-26 (terminal No. 5) main battery connector and C-109 (terminal No. 37) BMU connector

Check signal line for open circuit, short circuit to earth, short circuit to power supply system and damage.

Q. Is the check result normal?

	Go to Step 5 .

	Repair.

STEP 5. M.U.T.-III diagnosis code

Q. Is the diagnosis code set?

	Go to Step 6 .

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

STEP 6. After replacing the main battery, reconfirm the diagnosis code.

After replacing the main battery, reconfirm whether the diagnosis codes are set.

Q. Is the diagnosis code set?

	Replace the BMU.

	Check end.