Code No. B1109 Electric water heater fail 2




DIAGNOSIS CODE STORED CONDITIONS


This diagnosis code will be stored when the outlet temperature of the heater is higher than the inlet temperature by 40°C or more for 30 seconds or more after ten minutes have passed since the start of the heater control.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check the engine coolant level.


Check the engine coolant level (Refer to GROUP14A - On-vehicle Service, Engine coolant level check ).

Q. Is the engine coolant level correct?

Go to Step 2.
Check the engine coolant level, and add if necessary.

STEP 2. M.U.T.-III diagnosis code


Check if diagnosis code is stored in the heater controller assembly (A/C-ECU).

  • DTC: B1115

Q. Is the diagnosis code stored?

Carry out the diagnosis code procedures. Refer to .
Go to Step 3.

STEP 3. Check the heater water pump assembly.


Check heater water pump assembly.

Q. Is the water heater fluid confirmed?

Go to Step 8.
NO < Heater water pump assembly running noise can be heard> : Go to Step 4.
NO <Heater water pump assembly running noise can be heard, but the water heater fluid cannot be confirmed> : Replace the heater water pump assembly.

STEP 4. Measure the resistance at heater water pump assembly connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Resistance between the heater water pump assembly earth terminal and body earth
OK: Continuity exists (2 Ω or less).

Q. Is the check result normal?

Go to Step 7.
Go to Step 5.

STEP 5. Check of open circuit in earth line between heater water pump assembly and earth connector.


Q. Is the check result normal?

Go to Step 6.
Repair the connector(s) or wiring harness.

STEP 6. Check the heater water pump assembly.


Refer to .

Q. Is the check result normal?

Intermittent malfunction. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions .)
Replace the heater water pump assembly.

STEP 7. M.U.T.-III data list


Check that the following service data display contents are normal.

  • Item 170: ELC.water heater inlet sensor
  • Item 171: ELC.water heater outlet sensor

Q. Is the check result normal?

Go to Step 10.
NO : Go to Step 8.

STEP 8. Check the heater outlet water temperature sensor/heater inlet water temperature sensor.


Refer to .

Q. Is the check result normal?

Go to Step 9.
Replace the electric heater.

STEP 9. Check of open circuit in WTSI, WTSO, SENG line between electric heater connector and the heater controller assembly (A/C-ECU) connector.


Q. Is the check result normal?

Go to Step 10.
Repair the connector(s) or wiring harness.

STEP 10. Check of open circuit in +12V, HTR1, HTR2, HTR3 line between electric heater connector and the heater controller assembly (A/C-ECU) connector.


Q. Is the check result normal?

Go to Step 11.
Repair the connector(s) or wiring harness.

STEP 11. Check whether the diagnosis code is stored again.


Q. Is the diagnosis code stored?

Go to Step 12.
Intermittent malfunction. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions .)

STEP 12. After replacing the heater controller assembly (A/C-ECU) check again if the diagnosis code is stored.


Q. Is the diagnosis code stored?

Replace the electric heater.
This diagnosis is complete.