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
The traction battery cooling fan relay is controlled by
the EV-ECU, and supplies the power to the traction battery cooling fan. The EV-ECU monitors
the traction battery cooling fan relay coil drive circuit.
BMU communicates with EV-ECU via CAN.
DIAGNOSIS CODE SET CONDITIONS
While the traction battery cooling fan relay output is
turned OFF, the output status signal of the traction battery cooling fan relay is turned ON (during
the drive).
While the traction battery cooling fan relay output is turned ON, the output status
signal of the traction battery cooling fan relay is turned OFF (during the stop).
When the diagnosis code No. P1AC1 or No. P1A48 is set to the BMU, the diagnosis
code No. P1A2D will be set.
PROBABLE CAUSES
Malfunction of the BMU traction battery cooling fan system
Damaged wiring harness or connector(s)
Malfunction of the EV-ECU
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.
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.
)
)
)
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting 
.)
Then go to Step 2.