Code No. P0A09: DCDC converter (1)



AUXILIARY BATTERY CHARGING CONTROL CIRCUIT













OPERATION


The driving approval and driving state control of the DC-DC converter are performed by the EV-ECU.

DIAGNOSIS CODE SET CONDITIONS




COMMENT ON PAST TROUBLE


When the malfunction of the system cooling system or control voltage trouble is recorded as a past trouble, the diagnosis code may be set. Check the code.


PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list


Check the BMU service data. (Refer to .)
Data list
  • Item No. 7 : Battery total voltage
OK: 210 V or more

Q. Is the check result normal?

Go to Step 2.
Charge the main battery. Then go to Step 10.

STEP 2. Measure the voltage at E-03 on board charger/DC-DC converter connector.


(1)Disconnect the E-03 on board charger/DC-DC converter connector, and measure the voltage at the wiring harness side.
(2)Turn the electric motor switch to the "ON" position.
(3)Measure the voltage between the E-03 on board charger/DC-DC converter connector terminal No. 8 and the body earth.
OK: Battery voltage

Q. Is the check result normal?

Go to Step 5.
Go to Step 3.

STEP 3. Connector check: A-08X EV control relay (relay box) connecter, B-27 intermediate connector, E-03 on board charger/DC-DC converter connector


Q. Is the check result normal?

Go to Step 4.
Repair the damaged connector. Or, correct or replace the relay box.

STEP 4. Check the wiring harness between A-08X EV control relay (relay box) connector terminal No. 1 and E-03 on board charger/DC-DC converter connector terminal No. 8.


Check the power supply line for open circuit.

Q. Is the check result normal?

Go to Step 5.
Repair the wiring harness.

STEP 5. Connector check: E-03 on board charger/DC-DC converter connecter, C-111 EV-ECU connector


Q. Is the check result normal?

Go to Step 6.
Repair the damaged connector.

STEP 6. Check the wiring harness between E-03 on board charger/DC-DC converter connector terminal No. 4, 11 and C-111 EV-ECU connector terminal No. 116, 127.


Check the signal lines for open circuit.

Q. Is the check result normal?

Go to Step 7.
Repair the wiring harness.

STEP 7. Check the wiring harness between E-03 on board charger/DC-DC converter connector terminal No. 10 and the earth.


Check the earth line for open circuit.

Q. Is the check result normal?

Go to Step 8.
Repair the wiring harness.

STEP 8. Check of auxiliary battery charging warning lamp


With the connector connected, apply 12 V to the C-111 EV-ECU connector terminal No. 116.

  • Set the electric motor switch from the "LOCK" (OFF) position to the "ON", "START" position.
OK: The auxiliary battery charging warning lamp goes out.

Q. Is the check result normal?

Replace the on board charger/DC-DC converter. (Refer to .) Then go to Step 10.
Go to Step 9.

STEP 9. 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. (Refer to .) Then go to Step 10.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)

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?

Return to Step 1.
The diagnosis is complete.




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