B1133

DTC 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 ground) of IG1 setting circuit system is detected, OSS-ECU sets the DTC 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.

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

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

Q. Is the check result normal?

YES Go to Step 2.
NO 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 MB991958, set the forced power supply output to other than
"IG-ON" (Refer to forced power supply output procedure Programming and Relearning).

(3)Measure the voltage between the ETACS-ECU connector (IG1 terminal) and body ground.
OK: 1 V or less


(4)Using the scan tool MB991958, set the forced power supply output to "IG-ON" (Refer to forced power supply output procedure Programming and Relearning).

(5)Measure the voltage between the ETACS-ECU connector (IG1 terminal) and body ground.
OK: Battery voltage


Q. Is the check result normal?

YES Go to Step 3.
NO Replace the OSS-ECU and register the VIN (Refer to Programming and Relearning).
STEP 3. Using scan tool MB991958, check data list.

Check the OSS-ECU data list.





OK: Depending on the state of power supply mode, the display is turned ON/OFF.


Q. Is the check result normal?

YES Go to Step 4.
NO Replace the OSS-ECU and register the VIN (Refer to Programming and Relearning).
STEP 4. Check whether the DTC is reset.

Q. Is the DTC set?

YES Replace the ETACS-ECU.
NO Intermittent malfunction is suspected How to Cope With Intermittent Malfunctions)