Code No. P00B3: Coolant temperature sensor (short to earth)
Code No. P00B4: Coolant temperature sensor (open circuit)


WATER TEMPERATURE SENSOR CIRCUIT





OPERATION


The 5-V power is supplied from EV-ECU to the coolant temperature sensor, then the MCU coolant temperature is converted to the voltage and output to the EV-ECU.

DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Voltage measurement at E-04 coolant temperature sensor connector
(1)Disconnect the E-04 coolant temperature sensor connector, and measure the voltage at the wiring harness side.
(2)Turn the electric motor switch to the "ON" position.
(3)Measure the power supply voltage between the E-04 coolant temperature sensor connector terminal No. 1 and the body earth.
OK: 4.5 to 4.9 V

Q. Is the check result normal?
Go to Step 4.
Go to Step 2.

STEP 2. Connector check: E-04 coolant temperature connector, C-110 EV-ECU connector

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

STEP 3. Check the wiring harness between E-04 coolant temperature sensor connector terminal No. 1 and C-110 EV-ECU connector terminal No. 72.
Check the signal lines for open circuit and short to earth.

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. Connector check: E-04 coolant temperature connector, C-110 EV-ECU connector

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

STEP 5. Check the wiring harness between E-04 coolant temperature sensor connector terminal No. 2 and C-110 EV-ECU connector terminal No. 79.
Check the earth lines for open circuit and short to power supply.

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

STEP 6. Coolant temperature sensor check
Check the coolant temperature sensor. (Refer to GROUP 14 - On-vehicle Service - Coolant Temperature Sensor Check and Replace .)

Q. Is the check result normal?
Go to Step 7.
Replace the coolant temperature sensor. (Refer to GROUP 14 - On-vehicle Service - Coolant Temperature Sensor Check and Replace .) Then go to Step 9.

STEP 7. M.U.T.-III data list
Check the service data of the coolant temperature sensor. (Refer to .)

  • Item No. 82 : Coolant temperature sensor voltage

Q. Is the check result normal?
Go to Step 8.
Replace the coolant temperature sensor. (Refer to GROUP 14 - On-vehicle Service - Coolant Temperature Sensor Check and Replace .) Then go to Step 9.

STEP 8. 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 9.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)

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?
Return to Step 1.
The diagnosis is complete.




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