Code No. B1109
Electric water heater system abnormal stop 2
DIAGNOSIS CODE SET CONDITIONS
This code is set when the outlet temperature of the heater is higher
than the inlet temperature by 40°C or more for 30 seconds or more after 30 seconds has
passed since the start of the heater control.
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 19.
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. Connector check: A-114X heater water pump relay connector
Q.
Is the check result normal?
Go to Step 7.
Repair the damaged connector.
STEP 7. Check the heater water pump relay.
Refer to .
Q.
Is the heater water pump relay in good condition?
Go to Step 8.
Replace the heater water pump relay.
STEP 8. 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 10.
Go to Step 9.
STEP 9. 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 10. 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 12.
Go to Step 11.
STEP 11. 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 12. Check the wiring harness between A-114X heater water pump
relay connector terminal No. 2 and B-306 junction block connector terminal No. 9.
STEP 14. Check the wiring harness between A-114X heater water pump
relay connector terminal No. 1 and C-101 compressor & heater controller 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 15.
Repair the wiring harness.
STEP 15. 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 16.
Repair the wiring harness.
STEP 16. 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-27and repair it
if necessary.
Q.
Is the check result normal?
Go to Step 17.
Repair the wiring harness.
STEP 17. Check the wiring harness between A-113 heater connector terminal
connector terminal No. 6, 7, 8, 1, 2, 3, 4, 5 and C-101 compressor & heater controller
connector terminal No. 19, 17, 18, C-113 A/C control unit 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 18.
Repair the wiring harness.
STEP 18. Check whether the diagnosis code is reset.
Q.
Is the diagnosis code set?
Go to Step 19.
Intermittent malfunction. Refer to GROUP 00 - How to
Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)
STEP 19. After replacing the compressor & heater controller,
check again if the diagnosis code is set.
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Go to Step 2.
Make the water heater fluid volume correct.
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