Mitsubishi Montero (2004+). Manual - part 1048

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-35

Q: Is the harness wire between M-ASTC-ECU connector 

E-120 terminal 60 and ABS sensor <rear: RH> connector 
G-14 terminal 2 or M-ASTC-ECU connector E-120 
terminal 61 and ABS sensor <rear: RH> connector G-14 
terminal 1 damaged?
YES : Repair it and then go to Step 11.
NO :  Go to Step 11.

AC204390

AC204668

CONNECTOR: G-14

AC

G-14 HARNESS CONNECTOR:
COMPONENT SIDE

2 1

G-14(B)

AC204384

CONNECTOR: D-111

D-111

AC

9

21

33

35

24

12

3 4

7

8

5 6

39

28

41

30

18

4243

31

1920

32

40

29

1617

38

27

15

37

36

26

14

13

25

2

1

34

23

11

10

22

AC204385

CONNECTOR: E-110

AD

E-110

6

1

7

2

9

8

10

3

5

12

11

4

1314

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-36

STEP 9. Check the ABS sensor output voltage.

 Refer to 

P.35B-124

.

Output Voltage:

• When measured with a voltmeter: 42 mV or more

• When measured with oscilloscope (maximum voltage): 200 

mV or more

Q: Does the voltage meet the specification?

YES : Replace the M-ASTC-ECU and then go to Step 11.
NO :  Go to Step 10.

STEP 10. Check the wheel bearing.

Refer to GROUP 26, On-vehicle Service-Wheel Bearing Play 
Check <Front>

P.26-14

 or GROUP 27, On-vehicle Ser-

vice-Wheel Bearing Play Check <Rear>

P.27-12

. If play on the 

ball bearing is not within the standard value, replace the ball 
bearing.

Limit Value: 0 mm (0 inch)

Q: Is play on the ball bearing within the standard value?

YES :  Go to Step 11.
NO :  Replace it and then go to Step 11.

STEP 11. Recheck for diagnostic trouble code.
Q: Do the DTCs 21, 22, 23 or 24 reset?

YES : Go to Step 1.
NO :  The procedure is complete.

DTC 25: The Difference Diameter Tire

.

ABS DTC SET CONDITIONS
DTC 25 will be set when no ABS sensor DTC is set, 
slowest road wheel speed is 30 km/h (19 mph) or 
more, and any ABS sensor output signal indicates 
1.2 times faster speed than the slowest road wheel. 

.

TROUBLESHOOTING HINTS
The most likely causes for these DTCs to set are:

• Too high or low tire inflation pressure

• Incorrect tire size

• Flat tire

• Malfunction of the M-ASTC-ECU

.

DIAGNOSIS

Required Special Tools:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-37

STEP 1. Check the tires

(1) Check that all four tires are the same size.
(2) Check the inflation pressures of all the four tires. Refer to 

GROUP 31, On-vehicle Service 

P.31-88

.

Q: Are the tires in good condition?

YES : Replace the M-ASTC-ECU, and then go to Step 2.
NO :  Replace with a correct size tire or adjust the tire 

inflation pressure as necessary. Then go to Step 2. 

STEP 2. Recheck for diagnostic trouble code.
Q: Do the DTC 25 reset?

YES : Start over at Step 1.
NO :  The procedure is complete.

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-38

DTC 31: Ignition switch (IG2) (Open Circuit)

AC204645AB

M-ASTC-ECU Power Supply Circuit