Code No. P1A2D: Battery cooling fan abnormality (BMU)









caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.


OPERATION




DIAGNOSIS CODE SET CONDITIONS




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


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


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 line. (Refer to GROUP 54C - Troubleshooting .) Then go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines


Check again if the diagnosis code No. P1A2D is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Go to Step 3.
This diagnosis is complete.

STEP 3. Connector check: A-115X traction battery cooling fan relay (relay box) connecter


Q. Is the check result normal?

Go to Step 4.
Correct or replace the relay box.

STEP 4. Check the traction battery cooling fan relay itself.



  • Check the traction battery cooling fan relay itself.

Q. Is the check result normal?

Go to Step 5.
Replace the traction battery cooling fan relay.

STEP 5. Measure the resistance at A-115X traction battery cooling fan relay (relay box) connector.


(1)Disconnect the A-115X traction battery cooling fan relay, and measure the voltage at the wiring harness side.
(2)Measure the voltage between the A-115X traction battery cooling fan relay (relay box) connector terminal No. 1 and the body earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 6.
Repair the wiring harness.

STEP 6. Connector check: C-106 EV-ECU connecter


Q. Is the check result normal?

Go to Step 7.
Replace the damaged connector.

STEP 7. Measure the voltage at A-115X traction battery cooling fan relay (relay box) connector.


(1)Disconnect the C-106 EV-ECU.
(2)Disconnect the A-115X traction battery cooling fan relay, and measure the voltage at the wiring harness side.
(3)Turn the electric motor switch to the "ON" position.
(4)Measure the voltage between the A-115X traction battery cooling fan relay (relay box) connector terminal No. 2 and the body earth.
OK: 0 - 0.1 V

Q. Is the check result normal?

Go to Step 8.
Repair the wiring harness.

STEP 8. Check the wiring harness between C-106 EV -ECU connector terminal No. 2 and A-115X traction battery cooling fan relay (relay box) connector terminal No. 2.


Check output line for open circuit and short to earth.

Q. Is the check result normal?

Go to Step 9.
Repair the wiring harness.

STEP 9. Use M.U.T.-III to confirm a diagnosis code of other systems.


Check if one or some of the diagnosis codes are set to the BMU from No. P1AC1 or P1A48.

Q. Is the diagnosis code set?

Carry out troubleshooting for the diagnosis code No. P1AC1 (Refer to ) or No. P1A48 (Refer to ). Then go to Step 10.
Go to Step 10.

STEP 10. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the EV-ECU. Then go to Step 11.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

STEP 11. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Return to Step 1.
The diagnosis is complete.




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