Code No.B1133
IG1 setting circuit fail
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When replacing the ECU, always
check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
When a short circuit of IG1 setting circuit system is detected, KOS&OSS-ECU sets
diagnosis code No.B1133. 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
- IG1 setting circuit system is detected.
PROBABLE CAUSES
- Damaged wiring harness or connector (short to earth or
short to power supply in IG1 line)
- Malfunction of IG1 relay
- Malfunction of KOS&OSS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check of short to power supply or short to earth
circuit in IG1 line between KOS&OSS-ECU connector and IG1 relay connector
Q.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
STEP 2. IG1 relay check
Check that the IG1 relay works normally (Refer to 
).
Q.
Is the check result normal?
Go to Step 3.
Replace the IG1 relay.
STEP 3. Voltage measurement at IG1 relay connector (IG1 terminal)
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(1)Remove the IG1 relay and check at its energised side.
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(2)Using the M.U.T.-III, set the forced power supply output to other than "IG-ON"
(Refer to ).
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(3)Measure the voltage between the IG1 relay connector (IG1 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-ON" (Refer to ).
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(5)Measure the voltage between the IG1 relay connector (IG1 terminal) and body earth.
OK: System voltage
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Q.
Is the check result normal?
Go to Step 4.
Replace the KOS&OSS-ECU and register the chassis number (Refer to ).
STEP 4. M.U.T.-III data list
Check the KOS&OSS-ECU data list.
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Item No.
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Check item
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Power supply mode
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Display
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25
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IG1 output (monitor)
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ON (including START)
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ON
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Other than ON
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OFF
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OK: Depending on the state of power supply mode, the display is turned ON/OFF.
Q.
Is the check result normal?
Go to Step 5.
Replace the KOS&OSS-ECU and register the chassis number (Refer to ).
STEP 5. Check whether the diagnosis code is set again.
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 Malfunction ).