Code No.B1133 IG1 setting circuit fail


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

DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA


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.

PROBABLE CAUSES



  • Damaged wiring harness or connector (short to earth or short to power supply in IG1 line)
  • Malfunction of OSS-ECU
  • ETACS-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. Check of short circuit in IG1 line between OSS-ECU connector and ETACS-ECU connector

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 )