Mitsubishi Outlander (2013+). Manual - part 549

TROUBLESHOOTING <OSS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-57

Code No.B1131 Starter setting circuit fail

CAUTION

• Use caution that the cooling fan becomes 

activated when the forced power supply out-
put of M.U.T.-III is performed while the 
engine-ECU connector is disconnected. 
(Fail-safe for ETACS-ECU)

• 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 starter setting circuit system is detected, 
OSS-ECU sets the diagnosis code No.B1131. 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

• After OSS-ECU activation

Judgment Criterion

• When the following conditions are met:

a. When the starter setting signal is ON, the 

starter setting circuit voltage is less than 1.5 
V.

b. When the starter setting signal is OFF, the cir-

cuit voltage is 3.5 V or more.

PROBABLE CAUSES

• Damaged wiring harness or connector (short to 

earth or short to power supply in ST line, STO 
line or STOE line)

• Malfunction of OSS-ECU

• ETACS-ECU malfunction

• Malfunction of engine-ECU 

DIAGNOSIS PROCEDURE

STEP 1. Check of short to power supply, short to 
earth, and open circuit in ST, STO 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?

YES : 

Go to Step 2

NO : 

Repair the connector(s) or wiring harness.

STEP 2. Check of short to power supply, short to 
earth, and open circuit in STOE line between 
ETACS-ECU connector and engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 3

NO  : 

Repair the connector(s) or wiring harness.

STEP 3. Voltage measurement at engine-ECU 
connector (STOE terminal)
(1) Disconnect the engine-ECU connector, and 

measure at the wiring harness side.

(2) Using the M.U.T.-III, set the forced power supply 

output to other than "IG-ST".(Refer to 

P.42B-50

.)

(3) Measure the voltage between the engine-ECU 

connector (STOE terminal) and body earth.

OK: 1 V or less

(4) Using the M.U.T.-III, set the forced power supply 

output to "IG-ST".(Refer to 

P.42B-50

.)

(5) Measure the voltage between the engine-ECU 

connector (STOE terminal) and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4

NO  : 

Go to Step 5

STEP 4. M.U.T.-III data list
Check the OSS-ECU data list.
(1) Disconnect the engine-ECU connector.
(2) Using the M.U.T.-III, perform the forced power 

supply output.

State of 
forced 
power 
supply 
output

Item No.

Check item

Displ
ay

IG-ST

13

Cranking signal 
output(monitor)

ON

Other than 
IG-ST

OFF

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

Q: Is the check result normal?

TROUBLESHOOTING <OSS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-58

YES : 

Replace the engine-ECU and register the 

chassis number and key codes [Refer to 
GROUP 00 

− How to Perform Chassis 

Number (Chassis No.) Writing ].

NO : 

Replace the OSS-ECU and register the 
chassis number (Refer to 

P.42B-93

).

STEP 5. Voltage measurement at ETACS-ECU 
connector (STOE 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-ST".(Refer to 

P.42B-50

.)

(3) Measure the voltage between the ETACS-ECU 

connector (STOE terminal) and body earth.

OK: 1 V or less

(4) Using the M.U.T.-III, set the forced power supply 

output to "IG-ST".(Refer to 

P.42B-50

.)

(5) Measure the voltage between the ETACS-ECU 

connector (STOE terminal) and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6

NO : 

Replace the OSS-ECU and register the 
chassis number (Refer to 

P.42B-93

). Then 

go to Step 6

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

Intermittent malfunction is suspected (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.B1132 Starter 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) of starter 
setting circuit system is detected, or when an error to 
the starter starting circuit system is judged, 
OSS-ECU sets the diagnosis code No.B1132. At the 
same time, OSS-ECU displays the power supply 
system error warning screen to the multi information 
display of the combination meter.

JUDGEMENT CRITERIA

Check Conditions

• After OSS-ECU activation

Judgment Criterion

• When the following conditions are met:

a. When the starter setting signal is OFF, the 

cranking signal is received from engine-ECU.

b. When the starter setting signal is OFF, the 

ignition start signal is received from 
ETACS-ECU.

PROBABLE CAUSES

• Damaged wiring harness or connector (short to 

power supply in ST line, STO line or STOE line)

• Engine starting circuit system error (NTSW line)

• Malfunction of engine-ECU 

• ETACS-ECU malfunction

• Malfunction of OSS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III other system data list
Check the engine-ECU data list.

• Item No. 79: Cranking signal (Refer to GROUP 

13A 

− Troubleshooting, Service Data Reference 

Table .)

Q: Is the check result normal?

YES : 

Go to Step 2

NO : 

Carry out the troubleshooting for the 
diagnosis code No.B1131. Refer to .

STEP 2. Check of short to power supply, short to 
earth, and open circuit in NTSW line between 
starter relay connector and engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 3

NO : 

Repair the connector(s) or wiring harness.

STEP 3. M.U.T.-III other system data list
Check the ABS-ECU data list or ASC-ECU data list.

• Item No. 87: Ignition switch (input value) (Refer to 

GROUP 35B 

− Troubleshooting  <ABS> or 

GROUP 35C 

− Troubleshooting  <ASC>.)

Q: Is the check result normal?

TROUBLESHOOTING <OSS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-59

YES : 

Go to Step 4

NO : 

Replace the ETACS-ECU.

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code set?

YES (Set after 10 seconds or more have elapsed 
since the engine switch ON) : 

Replace the 

engine-ECU and register the chassis 
number and key codes [Refer to GROUP 00 
− How to Perform Chassis Number (Chassis 
No.) Writing ].

YES (Set within 10 seconds since the engine 
switch ON) : 

Replace the OSS-ECU and register 

the chassis number (Refer to 

P.42B-93

).

NO  : 

Intermittent malfunction is suspected (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

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

• After OSS-ECU activation

Judgment Criterion

• When the following conditions are met:

a. When the IG1 signal is ON, the IG1 circuit 

voltage is less than 1.5 V.

b. 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 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?

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 M.U.T.-III, set the forced power supply 

output to other than "IG-ON".(Refer to 

P.42B-50

.)

(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 

P.42B-50

.)

(5) Measure the voltage between the ETACS-ECU 

connector (IG1 terminal) and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the OSS-ECU and register the 
chassis number (Refer to 

P.42B-93

).

TROUBLESHOOTING <OSS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-60

STEP 3. M.U.T.-III data list
Check the OSS-ECU data list.

Power 
supply 
mode

Item No.

Check item

Displ
ay

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?

YES : 

Go to Step 4.

NO : 

Replace the OSS-ECU and register the 
chassis number (Refer to 

P.42B-93

). 

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

Intermittent malfunction is suspected (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction )

Code No.B1134 ECU power supply

CAUTION

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

DIAGNOSTIC FUNCTION

When an open circuit is detected in one of the two 
systems of OSS power supply, OSS-ECU sets the 
diagnosis code No.B1134. 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

• After OSS-ECU activation

Judgment Criterion

• When the following conditions are met, and 1 

second or more has elapsed.

a. +B1 is detected to be ON and +B2 is detected 

to be OFF.

b. When +B1 is OFF and +B2 is ON, OSS-ECU 

detects that the IOD fuse is mounted.

PROBABLE CAUSES

• Damaged wiring harness or connector (open cir-

cuit in +B line)

• Malfunction of OSS-ECU

• ETACS-ECU malfunction

NOTE: If the IGN fuse (10 A) is blown, there may be 
a short to earth between the fuse and OSS-ECU or 
between the fuse and electric steering lock power 
supply. However, because the IGN fuse is branched 
off, determine the root cause while referring to the 
Electrical Wiring Manual.

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the OSS-ECU data list.

Item No.

Check item

Normal 
condition

18

+B1 Power supply 
voltage (AD)

System 
voltage

19

+B2 Power supply 
voltage (AD)

System 
voltage

OK: Normal values are displayed for all the 
items

Q: Is the check result normal?

Normal conditions are displayed for all the items. : 

Go to Step 4.

Normal condition is not displayed for item No.18 : 

Go to Step 2.

Normal condition is not displayed for item No.19 : 

Go to Step 3.

STEP 2. Check of short to power supply, short to 
earth, and open circuit in +B1 line between 
OSS-ECU connector and fusible link

NOTE: Before the wiring harness check, check the 
joint connector, ETACS-ECU connector, and repair if 
necessary.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the connector(s) or wiring harness.