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DTC B1133: IG1 setting circuit fail
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
When a short circuit (short to power supply, short to ground) of IG1 setting circuit system is detected, OSS-ECU sets diagnostic trouble code No.B1133. At the same time, OSS-ECU displays the power supply system error warning screen to the multi information display of the combination meter, and flashes the indicator of electric motor switch in amber.
 
 
DTC SET CONDITION
Check Conditions
  • After OSS-ECU activation
Judgment Criterion
  • When the following conditions are met:
    1. When the IG1 signal is ON, the IG1 circuit voltage is less than 1.5 V.
    2. When the IG1 signal is OFF, the IG1 circuit voltage is 3.5 V or more.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness or connector (short to ground or short to power supply in IG1 line)
  • Malfunction of OSS-ECU
  • ETACS-ECU malfunction
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check of short to power supply, short to ground, and open circuit in IG1 line between OSS-ECU connector and ETACS-ECU connector
noteBefore the wiring harness check, check the joint connector, and repair if necessary.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
 
STEP 2. Voltage measurement at ETACS-ECU connector (IG1 terminal)
(1) Measure the ETACS-ECU connector side by backprobing.
(2) Using the scan tool (M.U.T.-IIISE), set the forced power supply output to other than "IG-ON".(Refer to .)
(3) Measure the voltage between the ETACS-ECU connector (IG1 terminal) and body ground.
OK: 1 V or less
(4) Using the scan tool (M.U.T.-IIISE), set the forced power supply output to "IG-ON".(Refer to .)
(5) Measure the voltage between the ETACS-ECU connector (IG1 terminal) and body ground.
OK: System voltage
Is the check result normal?
Go to Step 3.
Replace the OSS-ECU and register the VIN (Refer to ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check data list.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the power supply mode of the electric motor switch to the OFF before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the power supply mode of the electric motor switch to OFF.
Check the OSS-ECU data list.
 
Power supply modeItem No.Check itemDisplay
ON15IG1 output (monitor)ON
Other than ONOFF
OK: Depending on the state of power supply mode, the display is turned ON/OFF.
Is the check result normal?
Go to Step 4.
Replace the OSS-ECU and register the VIN (Refer to ).
 
STEP 4. Recheck for diagnostic trouble code.
(1) Erase the DTC.
(2) Turn the power supply mode of the electric motor switch from OFF to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the electric motor switch from ON to OFF.
Is the DTC set?
Replace the ETACS-ECU (Refer to GROUP 54A, ETACS - ETACS-ECU ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction )