Code No. B1108
Electric water heater system abnormal stop 1
DIAGNOSIS CODE SET CONDITIONS
This code is set when the outlet temperature of the heater does not raise
to a temperature higher than the inlet temperature by 3°C or more for 30 seconds or
more.
PROBABLE CAUSES
Insufficient volume of water heater fluid
Malfunction of high-voltage fuse No. 3
Poor connection of high-voltage fuse No. 3
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.
Drive the heater in READY status and visually check the flow of the water fluid volume
in the heater condenser tank.
Q.
Is the water heater fluid volume correct?
Go to Step 2.
Make the water heater fluid volume correct.
STEP 2. M.U.T.-III actuator test, service data
Check the results of the actuator test with the service data.
ACTUATOR TEST
Item 1: Electric water heater test mode
DATA LIST
Item 7: Electric water heater inspection
note
Because the heater test mode checks variations in the current, turn OFF the power supply
to other equipment before the test.
Q.
Is the check result normal?
Go to Step 3.
Go to Step 22.
STEP 3. Connector check: A-109 heater water pump assembly connector
Q.
Is the check result normal?
Go to Step 4.
Repair the damaged connector.
STEP 4. Check the heater water pump assembly.
Refer to .
Q.
Is the check result normal?
Go to Step 5.
Replace the heater water pump assembly.
STEP 5. 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 6.
Go to Step 22.
STEP 6. Connector check: A-113 heater connector
Q.
Is the check result normal?
Go to Step 7.
Repair the damaged connector.
STEP 7. Check the heater outlet water temperature sensor/heater
inlet water temperature sensor.
Refer to .
Q.
Is the check result normal?
Go to Step 8.
Replace the heater.
STEP 8. Connector check: A-114X heater water pump relay connector
Q.
Is the check result normal?
Go to Step 9.
Repair the damaged connector.
STEP 9. Check the heater water pump relay.
Refer to .
Q.
Is the heater water pump relay in good condition?
Go to Step 10.
Replace the heater water pump relay.
STEP 10. 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 12.
Go to Step 11.
STEP 11. 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 12. 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 14.
Go to Step 13.
STEP 13. 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 joint 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 14. Check the wiring harness between A-104X heater water pump
relay connector terminal No. 2 and B-305 junction block connector terminal No. 9.
Check the power supply line for open circuit.
Q.
Is the check result normal?
Go to Step 15.
Repair the wiring harness.
STEP 15. Connector check: C-101, C-115 A/C control unit connectors
Q.
Is the check result normal?
Go to Step 16.
Repair the damaged connector.
STEP 16. 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 17.
Repair the wiring harness.
STEP 17. 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 18.
Repair the wiring harness.
STEP 18. Check the wiring harness between A-109 heater water pump
assembly connector terminal No. 1 and C-115 compressor & heater controller 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 19.
Repair the wiring harness.
STEP 19. Connector check: A-113 heater connector
Q.
Is the check result normal?
Go to Step 20.
Repair the damaged connector.
STEP 20. 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 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 21.
Repair the wiring harness.
STEP 21. Check the high-voltage connector and wiring harness.
danger
Carry out the check on the high-voltage circuit while reading
carefully the precautions on handling a high-voltage vehicle. Refer to .
danger
Wear the specified protection equipment during the check.
1.Shut down the high voltage. (Refer to GROUP 00 - Precautions before Service
- Precautions on handling high-voltage vehicle .) 2.G-21 Check the heater connector. 3.G-23 Check the high-voltage fuse No. 3 connecting bolt for looseness. 4.Visually check and check the continuity of the high-voltage fuse No. 3. 5.Visually check the following high-voltage wiring harnesses for damage.
High-voltage wiring harness on main battery side
High-voltage harness heater side
Q.
Is the check result normal?
Go to Step 22.
NO <Malfunction of high-voltage fuse No. 3> : Replace the high-voltage fuse No. 3.
NO <Malfunction of wiring harness on heater side> : Replace the heater.
NO <Malfunction of wiring harness on main battery side> : Replace the main battery.
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.
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Go to Step 2.
Make the water heater fluid volume correct.
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