Code No. P1A43: Detection Circuit Of Main Battery Current Sensor Abnormal






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.
  • The control value of the main battery current sensor (high) is more than -20 A and less than 20 A.
  • Either one of the following diagnosis codes is not set.

    1. P1A42: Power supply circuit of main battery current sensor abnormal
    2. P1A40: Main battery current sensor (high) abnormal
    3. P1A41: Main battery current sensor (low) abnormal
Judgement Criterion
  • The difference is more than 10 A between the control value of the main battery current sensor (high) and the control value of the main battery current sensor (low).
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.
  • Either one of the following diagnosis codes is not set.

    1. P1A42: Power supply circuit of main battery current sensor abnormal
    2. P1A40: Main battery current sensor (high) abnormal
    3. P1A41: Main battery current sensor (low) abnormal
Judgement Criterion
  • The output voltage of the main battery current sensor (high) is less than 0.3 V.
or

  • The output voltage of the main battery current sensor (high) is more than 4.7 V.

FAIL-SAFE AND BACKUP FUNCTION

  • Turn off the balancer drive.

PROBABLE CAUSES

  • The main battery current sensor is failed.
  • Damage of main battery current sensor circuit; poor contact of connector.
  • The BMU is failed.

DIAGNOSIS PROCEDURE

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

  • Refer to Data List Reference Table .

    1. Item 12: electric current
    2. Item 13: main battery current sensor (high) control value
    3. Item 14: main battery current sensor (low) control value

Q. Are all check results normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2 .

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

Q. Is the check result normal?
Go to Step 3 .
Repair.

STEP 3. Check main battery current sensor itself.

  • Check main battery current sensor itself. (Refer to ).

Q. Is the check result normal?
Go to Step 4 .
Replace the main battery.

STEP 4. Connector check: C-109 BMU connector

Q. Is the check result normal?
Go to Step 5 .
Repair.

STEP 5. Check harness between C-26 (terminal No. 7) main battery connector and C-109 (terminal No. 33) BMU connector.

  • Check signal line for damage.

Q. Is the check result normal?
Go to Step 6 .
Repair.

STEP 6. Check harness between C-26 (terminal No. 3) main battery connector and C-109 (terminal No. 32) BMU connector.

  • Check signal line for damage.

Q. Is the check result normal?
Go to Step 7 .
Repair.

STEP 7. Perform resistance measurement at C-26 main battery connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 6 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 9 .
Go to Step 8 .

STEP 8. Check harness between C-26 (terminal No. 6) main battery connector and C-109 (terminal No. 43) BMU connector.

  • Check shield line for open circuit and damage.

Q. Is the check result normal?
Go to Step 9 .
Repair.

STEP 9. M.U.T.-III diagnosis code.

Q. Is the diagnosis code set?
Replace the BMU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).




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