Code No.B1130
Ignition power supply
| caution |
- If diagnosis
code No. B1130 is set, always diagnose the CAN bus lines.
- Before replacing ECU, ensure that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
If the output power supply status is different from the engine switch status information
received from ETACS-ECU via CAN, KOS&OSS-ECU sets diagnosis code No.B1130. At the same
time, KOS&OSS-ECU displays the power supply system error warning to the combination
meter, and flashes the indicator of engine switch in orange.
JUDGEMENT CRITERIA
Check Conditions
- The terminal voltage of IOD and +B is between 10 and 16 V.
Judgement Criterion
- Any of the following conditions is met, and 2 seconds or more have elapsed.
- The CAN information (ACC, IG1 or IG2) received from
ETACS-ECU is "ON" when the power supply mode is "OFF".
- The CAN information (ACC) received from ETACS-ECU is "OFF" when the power supply mode
is "ACC".
- The CAN information (IG1 or IG2) received from ETACS-ECU is "ON" when the power supply
mode is "ACC".
- The CAN information (ACC, IG1 or IG2) received from ETACS-ECU is "OFF" when the power
supply mode is "ON".
- The CAN information (ACC, IG1 or IG2) from ETACS-ECU not receive.
PROBABLE CAUSES
- Malfunction of the CAN bus line
- Damaged wiring harness or connector (short to earth, short to power supply, or open
circuit in ACC line, IG1 line or IG2 line)
- Malfunction of ACC relay
- Malfunction of IG1 relay
- Malfunction of IG2 Relay
- Malfunction of KOS&OSS-ECU
- Malfunction of ETACS-ECU
- Commercial electric products that are connected to the accessory socket
| note |
Be sure to remove the commercial electric products that are connected to the accessory
socket before troubleshooting. Otherwise troubleshooting cannot be performed correctly.
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DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
After performing the forced power supply output (Refer to 
)
IG-ON using the M.U.T.-III, diagnose the CAN bus line.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
STEP 2. M.U.T.-III diagnosis code
Check if KOS&OSS-ECU diagnosis code No.B1133 is set.
Q.
Is the diagnosis code set?
Troubleshoot for the relevant diagnosis code (Refer to ).
Go to Step 3.
STEP 3. M.U.T.-III other system data list
Operate the engine switch to change the power supply mode, and check that the data list
display of ETACS-ECU is changed.
- When power supply mode is "OFF".
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ETACS-ECU data list
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Item No.
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Item name
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Normal condition
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29
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Ignition switch(ACC)
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OFF
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30
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Ignition switch(IG1)
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OFF
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44
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Ignition switch(IG2)
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OFF
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- When power supply mode is "ACC".
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ETACS-ECU data list
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Item No.
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Item name
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Normal condition
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29
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Ignition switch(ACC)
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ON
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30
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Ignition switch(IG1)
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OFF
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44
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Ignition switch(IG2)
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OFF
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- When power supply mode is "ON".
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ETACS-ECU data list
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Item No.
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Item name
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Normal condition
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29
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Ignition switch(ACC)
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ON
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30
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Ignition switch(IG1)
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ON
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44
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Ignition switch(IG2)
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ON
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OK: Normal conditions are displayed for all the items.
Q.
Are the check result normal?
YES (Normal conditions are displayed for all the items)
: Go to Step 27.
NO (Normal condition is not displayed for item No. 2.) : Go to Step 4.
NO (Normal condition is not displayed for item No. 30) : Go to Step 11.
NO (Normal condition is not displayed for item No. 44) : Go to Step 18.
STEP 4. ACC relay check
Check that the ACC relay works normally (Refer to ).
Q.
Is the check result normal?
Go to Step 5.
Replace the ACC relay.
STEP 5. Resistance measurement at ACC relay connector (earth line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the ACC relay connector (earth line) and the body
earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 7.
Go to Step 6.
STEP 6. Check of open circuit in earth line between the ACC relay
connector and the body earth
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.
STEP 7. Voltage measurement at ACC relay connector (ACC line and power
supply line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the voltage between the ACC relay connector (power supply line) and the
body earth.
OK: System voltage
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(3)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
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(4)Measure the voltage between the ACC relay connector (ACC line) and the body earth.
OK: System voltage
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(5)Turn the engine switch from "ON" position to "LOCK" (OFF) position.
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(6)Measure the voltage between the ACC relay connector (ACC line) and the body earth.
OK: 1 V or less
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Q.
Is the check result normal?
Go to Step 10.
Go to Step 8.
STEP 8. Check of short to power supply, short to earth or open circuit
in ACC line between the KOS&OSS-ECU connector and the ACC relay connector
Q.
Is the check result normal?
Go to Step 9.
Repair the connector(s) or wiring harness.
STEP 9. Check of short to power supply, short to earth or open circuit
in power supply line between the fusible link connector and the ACC relay connector
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
STEP 10. Voltage measurement at ETACS-ECU connector (ACC line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
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(3)Measure the voltage between the ETACS-ECU connector (ACC line) and the body earth.
OK: System voltage
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(4)Turn the engine switch from "ON" position to "LOCK" (OFF) position.
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(5)Measure the voltage between the ETACS-ECU connector (ACC line) and the body earth.
OK: 1 V or less
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Q.
Is the check result normal?
Go to Step 25.
Repair the wiring harness, ACC line between the ETACS-ECU connector and the fusible
link.
STEP 11. IG1 relay check
Check that the IG1 relay works normally (Refer to ).
Q.
Is the check result normal?
Go to Step 12.
Replace the IG1 relay.
STEP 12. Resistance measurement at IG1 relay connector (earth line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the IG1 relay connector (earth line) and the body
earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 14.
Go to Step 13.
STEP 13. Check of open circuit in earth line between the IG1 relay
connector and the body earth
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.
STEP 14. Voltage measurement at IG1 relay connector (IG1 line and
power supply line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the voltage between the IG1 relay connector (power supply line) and the
body earth.
OK: System voltage
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(3)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
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(4)Measure the voltage between the IG1 relay connector (IG1 line) and the body earth.
OK: System voltage
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(5)Turn the engine switch from "ON" position to "LOCK" (OFF) position.
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(6)Measure the voltage between the IG1 relay connector (IG1 line) and the body earth.
OK: 1 V or less
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Q.
Is the check result normal?
Go to Step 17.
Go to Step 15.
STEP 15. Check of short to power supply, short to earth or open circuit
in IG1 line between the KOS&OSS-ECU connector and the IG1 relay connector
Q.
Is the check result normal?
Go to Step 16.
Repair the connector(s) or wiring harness.
STEP 16. Check of short to power supply, short to earth or open circuit
in power supply line between the fusible link connector and the IG1 relay connector
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
STEP 17. Voltage measurement at ETACS-ECU connector (IG1 line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
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(3)Measure the voltage between the ETACS-ECU connector (IG1 line) and the body earth.
OK: System voltage
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(4)Turn the engine switch from "ON" position to "LOCK" (OFF) position.
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(5)Measure the voltage between the ETACS-ECU connector (IG1 line) and the body earth.
OK: 1 V or less
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Q.
Is the check result normal?
Go to Step 25.
Repair the wiring harness, IG1 line between the ETACS-ECU connector and the fusible link.
STEP 18. IG2 relay check
Check that the IG2 relay works normally (Refer to ).
Q.
Is the check result normal?
Go to Step 19.
Replace the IG2 relay.
STEP 19. Resistance measurement at IG2 relay connector (earth line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the IG2 relay connector (earth line) and the body
earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 21.
Go to Step 20.
STEP 20. Check of open circuit in earth line between the IG2 relay
connector and the body earth
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.
STEP 21. Voltage measurement at IG2 relay connector (IG2 line and
power supply line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the voltage between the IG2 relay connector (power supply line) and the
body earth.
OK: System voltage
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(3)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
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(4)Measure the voltage between the IG2 relay connector (IG2 line) and the body earth.
OK: System voltage
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(5)Turn the engine switch from "ON" position to "LOCK" (OFF) position.
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(6)Measure the voltage between the IG2 relay connector (IG2 line) and the body earth.
OK: 1 V or less
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Q.
Is the check result normal?
Go to Step 24.
Go to Step 22.
STEP 22. Check of short to power supply, short to earth or open circuit
in IG2 line between the KOS&OSS-ECU connector and the IG2 relay connector
Q.
Is the check result normal?
Go to Step 23.
Repair the connector(s) or wiring harness.
STEP 23. Check of short to power supply, short to earth or open circuit
in power supply line between the fusible link connector and the IG2 relay connector
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
STEP 24. Voltage measurement at ETACS-ECU connector (IG2 line)
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
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(3)Measure the voltage between the ETACS-ECU connector (IG2 line) and the body earth.
OK: System voltage
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(4)Turn the engine switch from "ON" position to "LOCK" (OFF) position.
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(5)Measure the voltage between the ETACS-ECU connector (IG2 line) and the body earth.
OK: 1 V or less
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Q.
Is the check result normal?
Go to Step 25.
Repair the wiring harness, IG2 line between the ETACS-ECU connector and the fusible link.
STEP 25. M.U.T.-III other system data list
Operate the engine switch to change the power supply mode, and check that the data list
display of ETACS-ECU is changed.
- When power supply mode is "OFF".
|
|
ETACS-ECU data list
|
Item No.
|
Item name
|
Normal condition
|
29
|
Ignition switch(ACC)
|
OFF
|
30
|
Ignition switch(IG1)
|
OFF
|
44
|
Ignition switch(IG2)
|
OFF
|
|
- When power supply mode is "ACC".
|
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ETACS-ECU data list
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Item No.
|
Item name
|
Normal condition
|
29
|
Ignition switch(ACC)
|
ON
|
30
|
Ignition switch(IG1)
|
OFF
|
44
|
Ignition switch(IG2)
|
OFF
|
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- When power supply mode is "ON".
|
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ETACS-ECU data list
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Item No.
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Item name
|
Normal condition
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29
|
Ignition switch(ACC)
|
ON
|
30
|
Ignition switch(IG1)
|
ON
|
44
|
Ignition switch(IG2)
|
ON
|
|
OK: Normal conditions are displayed for all the items.
Q.
Are the check result normal?
YES (Normal conditions are displayed for all the items) : Go to Step 26.
NO (Normal condition is not displayed for item No. 29) : Go to Step 27.
NO (Normal condition is not displayed for item No. 30) : Go to Step 27.
NO (Normal condition is not displayed for item No. 44) : Go to Step 27.
STEP 26. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the KOS&OSS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
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(3)On completion, check that the diagnosis code is set again.
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Q.
Is the diagnosis code set?
Replace the ETACS-ECU.
Intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ).
STEP 27. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the KOS&OSS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
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(3)On completion, check that the diagnosis code is not set again.
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Q.
Is the diagnosis code set?
Replace the KOS&OSS-ECU and register the chassis number (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ).