Code No.B1130 Ignition power supply



caution
  • If the diagnosis code No. B1130 is set, always diagnose the CAN bus lines.
  • Before replacing ECU, ensure that the communication circuit is normal.

DIAGNOSTIC FUNCTION


If the output power supply status is different from the engine switch status information received from ETACS-ECU via CAN, OSS-ECU sets the diagnosis code No.B1130. 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. The engine switch status information received from ETACS-ECU is other than OFF when the power supply mode of OSS is OFF.
  2. The engine switch status information received from ETACS-ECU is other than ACC when the power supply mode of OSS is ACC.
  3. The engine switch status information received from ETACS-ECU is other than ON when the power supply mode of OSS is ON.
  4. The engine switch status information received from ETACS-ECU is other than START when the power supply mode of OSS is START.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


After performing the forced power supply output (refer to ) "IG-ON" using the M.U.T.-III, diagnose the CAN bus line.

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

STEP 2. M.U.T.-III diagnosis code


Check if OSS-ECU diagnosis code No.B1131 or B1133 is set.

Q. Is the diagnosis code set?

Troubleshoot for the relevant diagnosis code. Refer to .
Go to Step 3.

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


Operate the engine switch to change the power supply mode, and check that the data list display of ETACS-ECU is changed.

WHEN POWER SUPPLY MODE IS ACC (ENGINE SWITCH INDICATOR IS ILLUMINATED IN ORANGE)
ETACS-ECU data list
Item No.
Check item
Display
288
ACC switch
ON

WHEN POWER SUPPLY MODE IS ON (ENGINE SWITCH INDICATOR IS ILLUMINATED IN GREEN)
ETACS-ECU data list
Item No.
Check item
Display
254
IG voltage
System voltage

WHEN POWER SUPPLY MODE IS START (DURING CRANKING)
ETACS-ECU data list
Item No.
Check item
Display
287
Starter switch
ON

Q. Is the check result normal?

All items agree with each other : Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Do not match when power supply mode is ACC : Go to Step 4.
Do not match when power supply mode is ON : Go to Step 5.
Do not match when power supply mode is START (during cranking) : Go to Step 6.

STEP 4. Check of short to power supply, short to earth and open circuit in ACC 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 7.
Repair the connector(s) or wiring harness.

STEP 5. 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 7.
Repair the connector(s) or wiring harness.

STEP 6. Check of short to power supply, short to earth and open circuit in STO line between OSS-ECU connector and ETACS-ECU connector


Q. Is the check result normal?

Go to Step 7.
Repair the connector(s) or wiring harness.

STEP 7. M.U.T.-III data list


Check the OSS-ECU data list. (Check only where a problem is present.)

  • Using the M.U.T.-III, perform the forced power supply output.
State of forced power supply output
Item No.
Check item
Display
IG-ON
15
IG1 output (monitor)
ON
OFF
IG-ST
13
Cranking signal output(monitor)
ON
OFF
OK: Depending on the state of forced power supply output, the display is turned ON/OFF.

Q. Is the check result normal?

Go to Step 8.
Replace the OSS-ECU and register the chassis number (Refer to ).

STEP 8. M.U.T.-III other system data list


Operate the engine switch to change the power supply mode, and check that the data list display of ETACS-ECU is changed. (Check only where a problem is present.)

WHEN POWER SUPPLY MODE IS ACC (ENGINE SWITCH INDICATOR IS ILLUMINATED IN ORANGE)
ETACS-ECU data list
Item No.
Check item
Display
288
ACC switch
ON

WHEN POWER SUPPLY MODE IS ON (ENGINE SWITCH INDICATOR IS ILLUMINATED IN GREEN)
ETACS-ECU data list
Item No.
Check item
Display
254
IG voltage
System voltage

WHEN POWER SUPPLY MODE IS START (DURING CRANKING)
ETACS-ECU data list
Item No.
Check item
Display
287
Starter switch
ON

Q. Is the check result normal?

The power supply mode and data list change agree with each other : Go to Step 9.
The power supply mode and data list change do not agree with each other : Replace the ETACS-ECU.

STEP 9. Check whether the diagnosis code is reset.


Q. Is the diagnosis code set?

Replace the 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 ).