Mitsubishi Montero (2002-2004). Manual - part 1111

 

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Mitsubishi Montero (2002-2004). Manual - part 1111

 

 

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-61

.

AC204606

Can Bus Communication Circuit

AC204170

CONNECTOR: D-117

BS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-62

CIRCUIT OPERATION
The M-ASTC-ECU receives signals through the CAN 
bus line from the steering wheel sensor, the G and 
yaw rate sensor, and the power control module.

.

TECHNICAL DESCRIPTION (COMMENT)
If the Active skid control system does not work nor-
mally, the CAN main bus line or the terminator resis-
tor may be suspected. (ECUs and the sensor may 
also be suspected, and check the condition of the 
CAN main bus line according to this diagnosis sec-
tion.)

.

TROUBLESHOOTING HINTS

• The CAN main bus line may be defective

• The M-ASTC-ECU integrated or separate termi-

nator resistor may be defective

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

DIAGNOSIS 

Required Special Tools:

• MB991223: Harness Set

STEP 1. Measure the voltage in the CAN_L line. Measure at 
data link connector D-117.

CAUTION

Before checking CAN bus lines and their interconnected 
components, "ground" yourself, by touching a metal 
object such as an unpainted pipe, this will discharge any 
potentially damaging static that may have built up.

CAUTION

When measuring resistance value or voltage in CAN bus 
lines, use a digital multimeter. If not using a digital multim-
eter, the equipments connected through the CAN bus lines 
may be damaged.
(1) Disconnect resistor connector D-130 and M-ASTC-ECU 

connector E-121, and measure the voltage at data link 
connector D-117.

(2) Turn the ignition switch to the "ON" position.

CAUTION

Always use the test harness when measuring the voltage 
or resistance at the female connector. If you fail to do so, 
connectors may be damaged.

(3) Measure the voltage between data link connector D-117 

terminal 28 and body ground.

• The voltage should measure 0.5 volts or more, or 4.5 

volts or less.

Q: Does the voltage measure 0.5 volts or more, or 4.5 volts 

or less?
YES : 
Go to Step 2.
NO :  Diagnose the CAN_L side bus line by referring to 

P.35C-65

.

AC204170

CONNECTOR: D-117

HARNESS SIDE

AM

21

26

22

27 2829 30

23

31

24

32

25

33

AC204575

21

26

22

27 2829 30

23

31

24

32

25

33

HARNESS SIDE: D-117

AB

TEST 
HARNESS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-63

STEP 2. Measure the voltage in the CAN_H line. Measure at 
DTC connector D-117.

CAUTION

Before checking CAN bus lines and their interconnected 
components, "ground" yourself, by touching a metal 
object such as an unpainted pipe, this will discharge any 
potentially damaging static that may have built up.

CAUTION

When measuring resistance value or voltage in CAN bus 
lines, use a digital multimeter. If not using a digital multim-
eter, the equipments connected through the CAN bus lines 
may be damaged.
(1) Disconnect resistor connector D-130 and M-ASTC-ECU 

connector E-121, and measure the voltage at data link 
connector D-117.

(2) Turn the ignition switch to the "ON" position.

CAUTION

Always use the test harness when measuring the voltage 
or resistance at the female connector. If you fail to do so, 
connectors may be damaged.

(3) Measure the voltage between data link connector D-117 

terminal 23 and body ground.

• The voltage should measure 0.5 volts or more, or 4.5 

volts or less.

Q: Does the voltage measure 0.5 volts or more, or 4.5 volts 

or less?
YES : 
Go to Step 3.
NO :  Diagnose the CAN_H side bus line by referring to 

P.35C-92

.

AC204170

CONNECTOR: D-117

HARNESS SIDE

AM

21

26

22

27 2829 30

23

31

24

32

25

33

AC204575

21

26

22

27 2829 30

23

31

24

32

25

33

HARNESS SIDE: D-117

TEST 
HARNESS

AC

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-64

STEP 3. Check the terminator resistor.

CAUTION

Before checking CAN bus lines and their interconnected 
components, "ground" yourself, by touching a metal 
object such as an unpainted pipe, this will discharge any 
potentially damaging static that may have built up.

CAUTION

When measuring resistance value or voltage in CAN bus 
lines, use a digital multimeter. If not using a digital multim-
eter, the equipments connected through the CAN bus lines 
may be damaged.
(1) Measure the resistance at data link connector D-117.
(2) Turn the ignition switch to the LOCK (OFF) position.

CAUTION

Disconnect the negative battery terminal when measuring 
the resistance value in the CAN bus line. If you fail to do 
so, the equipments connected through the CAN bus lines 
may be damaged.
(3) Disconnect the negative battery terminal.

CAUTION

Always use the test harness when measuring the voltage 
or resistance at the female connector. If you fail to do so, 
connectors may be damaged.
(4) Measure the resistance between data link connector D-117 

terminals 23 and 28.

• The resistance should measure 60 ± 10 ohms.

Q: Does the resistance measure 60 

± 10 ohms?

YES : Go to Step 4.
NO :  Diagnose the terminator resistor and the CAN main 

bus line by referring to 

P.35C-119

.

STEP 4. Check for M-ASTC DTC.
Once the CAN main bus line has been diagnosed, erase all the 
DTCs, and then recheck for the DTCs.
Q: Is the DTC reset?

YES : Replace the M-ASTC-ECU.
YES <DTC 36 or 38 is set> : Diagnose the CAN bus line 

(between the main bus line and the power control 
module). Refer to 

P.35C-164

.

YES <DTC 67 is set> : Diagnose the CAN bus line 

(between the main bus line and the steering wheel 
sensor). Refer to 

P.35C-168

.

YES <DTC 74 is set> : Diagnose the CAN bus line 

(between the main bus line and the G and yaw rate 
sensor). Refer to 

P.35C-174

.

NO <no DTC is set> : Retest the system.

AC204170

CONNECTOR: D-117

HARNESS SIDE

AM

21

26

22

27 2829 30

23

31

24

32

25

33

AC204576

21

26

22

27 2829 30

23

31

24

32

25

33

HARNESS SIDE: D-117

TEST 
HARNESS

AB

TEST 
HARNESS

 

 

 

 

 

 

 

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