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



JUDGEMENT CRITERIA


Check Conditions
  • The terminal voltage of +B1 and +B2 is between 10 and 16 V.
Judgment Criterion
  • Any of the following conditions is met, and 2 seconds or more have elapsed.

  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



  • Malfunction of the CAN bus line
  • Damaged wiring harness or connector (short to earth, short to power supply, or open circuit in ACC line, IG1 line, or STO line)
  • Malfunction of OSS-ECU
  • ETACS-ECU malfunction

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 and open circuit in ACC 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 5. Check of open circuit in IG1 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 6. Check of 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 ).