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
.
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
.
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
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
.
YES <DTC 67 is set> : Diagnose the CAN bus line
(between the main bus line and the steering wheel
sensor). Refer to
.
YES <DTC 74 is set> : Diagnose the CAN bus line
(between the main bus line and the G and yaw rate
sensor). Refer to
.
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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