MSB is released for this page as follows:

Release Date	Subject	MSB No.
2012-02-16	A/C DIAGNOSIS CODE	MSB-12E55-501
2012-05-30	A/C DIAGNOSIS CODE	MSB-12E55-501A

Code No. B1110 Electric water heater system abnormal stop 3

DIAGNOSIS CODE SET CONDITIONS

This code is set when one of the heater water temperatures at the inlet, outlet, or heater core reaches 100°C or more for 3 seconds or more.

PROBABLE CAUSES

Insufficient volume of water heater fluid
Malfunction of heater water pump assembly
Malfunction of heater
Damaged harness wires and connectors
Malfunction of A/C control unit

DIAGNOSIS PROCEDURE

STEP 1. Check the water heater fluid volume.

Q. Is the water heater fluid volume correct?

	Go to Step 2.

	Make the water heater fluid volume correct.

STEP 2. Check the heater water pump assembly.

Drive the heater in READY status and visually check the flow of the water fluid volume in the heater condenser tank.

Q. Is the heater water pump assembly in good condition?

	Go to Step 3.

	Replace the heater water pump assembly.

STEP 3. M.U.T.-III data list

Check that the following service data display contents are normal.

Item 8: Electric water pump output
Item 10: Electric water heater inlet water temperature sensor
Item 11: Electric water heater outlet water temperature sensor

Q. Is the check result normal?

	Go to Step 4.

	Go to Step 22.

STEP 4. Connector check: A-113 heater connector

Q. Is the check result normal?

	Go to Step 5.

	Repair the damaged connector.

STEP 5. Check the heater outlet water temperature sensor/heater inlet water temperature sensor.

Refer to

Q. Is the check result normal?

	Go to Step 6.

	Replace the heater.

STEP 6. Heater controller (A/C-ECU) M.U.T.-III service data

Check that the following service data display contents are normal.

Item 24: Coolant temperature sensor

Q. Is the check result normal?

	Go to Step 9.

	Go to Step 7.

STEP 7. Connector check: B-18 heater water temperature connector

Q. Is the check result normal?

	Go to Step 8.

	Repair the damaged connector.

STEP 8. Check the heater water temperature sensor.

Refer to

Q. Is the check result normal?

	Go to Step 9.

	Replace the heater.

STEP 9. Connector check: A-114X heater water pump relay connector

Q. Is the check result normal?

	Go to Step 10.

	Repair the damaged connector.

STEP 10. Check the heater water pump relay.

Refer to

Q. Is the heater water pump relay in good condition?

	Go to Step 11.

	Replace the heater water pump relay.

STEP 11. Measure the voltage at A-114X heater water pump relay connector.

(1)Disconnect the connector, and measure at the wiring harness side.

(2)Voltage between terminal 4 and body earth
OK: Battery voltage

Q. Is the check result normal?

	Go to Step 13.

	Go to Step 12.

STEP 12. Check the wiring harness between A-114X heater water pump relay connector terminal No. 4 and the fusible link (2).

Check the power supply line for open circuit.

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 .)

	Repair the wiring harness.

STEP 13. Measure the resistance at A-109 heater water pump assembly connector.

(1)Disconnect the connector, and measure at the wiring harness side.

(2)Resistance between terminal No. 2 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

	Go to Step 15.

	Go to Step 14.

STEP 14. Check the wiring harness between A-109 heater water pump assembly connector terminal No. 2 and the body earth.

Check the earth wires for open circuit.

note

Before checking the wiring harness, check the earth connector B-122 and repair it if necessary.

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 .)

	Repair the wiring harness.

STEP 15. Check the wiring harness between A-104X heater water pump relay connector terminal No. 2 and B-306 junction block connector terminal No. 9.

Check the power supply line for open circuit.

Q. Is the check result normal?

	Go to Step 16.

	Repair the wiring harness.

STEP 16. Connector check: C-101, C-113 compressor & heater controller connectors

Q. Is the check result normal?

	Go to Step 17.

	Repair the damaged connector.

STEP 17. Check the wiring harness between A-114X heater water pump relay connector terminal No. 1 and C-101 A/C control unit connector terminal No. 7.

Check the power supply line for open circuit.

note

Before checking the wiring harness, check the intermediate connector B-27 and repair it if necessary.

Q. Is the check result normal?

	Go to Step 18.

	Repair the wiring harness.

STEP 18. Check the wiring harness between A-114X heater water pump relay connector terminal No. 3 and A-109 heater water pump assembly connector terminal No. 1.

Check the power supply line for open circuit.

Q. Is the check result normal?

	Go to Step 19.

	Repair the wiring harness.

STEP 19. Check the wiring harness between A-109 heater water pump assembly connector terminal No. 1 and C-113 A/C control unit connector terminal No. 29.

Check the input line for open circuit.

note

Before checking the wiring harness, check the intermediate connector B-27 and repair it if necessary.

Q. Is the check result normal?

	Go to Step 20.

	Repair the wiring harness.

STEP 20. Connector check: A-113 heater connector

Q. Is the check result normal?

	Go to Step 21.

	Repair the damaged connector.

STEP 21. Check the wiring harness between A-113 heater connector terminal connector terminal No. 6, 7, 8, 1, 2, 3, 4, 5 and C-101 A/C control unit connector terminal No. 19, 17, 18, C-113 compressor & heater controller connector terminal No. 25, 33, 34, 35, 36.

Check the input line for open circuit.

note

Before checking the wiring harness, check the intermediate connector B-01 and repair it if necessary.

Q. Is the check result normal?

	Go to Step 22.

	Repair the wiring harness.

STEP 22. Check whether the diagnosis code is reset.

Q. Is the diagnosis code set?

	Go to Step 23.

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

STEP 23. After replacing the compressor & heater controller, check again if the diagnosis code is set.

Q. Is the diagnosis code set?

	Replace the heater.

	This diagnosis is complete.

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