Code No.B1133 IG1 setting circuit fail



caution When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION


When a short circuit (short to power supply, short to earth) of IG1 setting circuit system is detected, OSS-ECU sets the diagnosis 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 engine switch in orange.

JUDGEMENT CRITERIA


Check Conditions
Judgment Criterion
  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.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check of short to power supply, short to earth, and open circuit in IG1 line between OSS-ECU connector and ETACS-ECU connector


note Before the wiring harness check, check the joint connector, and repair if necessary.

Q. 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 M.U.T.-III, 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 earth.
OK: 1 V or less
(4)Using the M.U.T.-III, set the forced power supply output to "IG-ON".(Refer to .)
(5)Measure the voltage between the ETACS-ECU connector (IG1 terminal) and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 3.
Replace the OSS-ECU and register the chassis number (Refer to ).

STEP 3. M.U.T.-III data list


Check the OSS-ECU data list.
Power supply mode
Item No.
Check item
Display
ON
15
IG1 output (monitor)
ON
Other than ON
OFF
OK: Depending on the state of power supply mode, the display is turned ON/OFF.

Q. Is the check result normal?

Go to Step 4.
Replace the OSS-ECU and register the chassis number (Refer to ).

STEP 4. Check whether the diagnosis code is reset.


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 Malfunction )