Code No.B1131
Starter setting circuit fail
caution |
- When replacing
the ECU, always check that the communication circuit is normal.
|
DIAGNOSTIC FUNCTION
When a short circuit of starter setting circuit system is detected, KOS&OSS-ECU
sets diagnosis code No.B1131. 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
- After KOS&OSS-ECU activation
Judgement Criterion
- Starter setting circuit system is detected
PROBABLE CAUSES
- Damaged wiring harness or connector (short to earth or
short to power supply in ST line)
- Malfunction of KOS&OSS-ECU
- Malfunction of engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check of short to power supply, short to earth
or open circuit in ST line between KOS&OSS-ECU connector and engine-ECU connector
Q.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
STEP 2. Voltage measurement at engine-ECU connector (ST terminal)
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(1)Disconnect the engine-ECU connector, and measure at the wiring harness side.
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(2)Using the M.U.T.-III, set the forced power supply output to other than "IG-ST"
(Refer to ).
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(3)Measure the voltage between the engine-ECU connector (ST terminal) and body earth. OK: 1 V or less
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(4)Using the M.U.T.-III, set the forced power supply output to "IG-ST" (Refer to ).
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(5)Measure the voltage between the engine-ECU connector (ST terminal) and body earth. OK: System voltage
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Q.
Is the check result normal?
Go to Step 3.
NO :
STEP 3. 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 engine-ECU and register the chassis number and key codes [Refer
to GROUP 00 - How to Perform Chassis Number (Chassis No.) Writing
].
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction
).