Mitsubishi Montero (2004+). Manual — part 1087
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-59
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
• MB991223: Harness Set
Initialize the M-ASTC-ECU (Recheck for diagnostic trouble
code).
Initialize the M-ASTC-ECU (Refer to
), and check
that the DTC sets.
Q: Does DTC 84 reset?
YES : Replace the M-ASTC-ECU.
NO : The procedure is complete.
DTC 85: Master cylinder pressure sensor not initialized
.
CIRCUIT OPERATION
The pressure sensor, which is energized by the
M-ASTC-ECU, monitors the brake fluid pressure
applied by the master cylinder. If this pressure
becomes low, the signal from this pressure sensor
turns on the pressure switch.
.
M-ASTC DTC SET CONDITION
DTC 85 will be set when a new M-ASTC-ECU is not
initialized.
.
TROUBLESHOOTING HINTS
The most likely causes for DTC 84 to set are:
• M-ASTC-ECU not initialized
• The M-ASTC-ECU is defective.
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
• MB991223: Harness Set
Initialize the M-ASTC-ECU (Recheck for diagnostic trouble
code).
Initialize the M-ASTC-ECU (Refer to
), and check
that the DTC sets.
Q: Does DTC 85 reset?
YES : Replace the M-ASTC-ECU.
NO : The procedure is complete.
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-60
CAN BUS LINE DIAGNOSTICS
Precautions on how to repair the CAN communication lines
M1353006000027
.
Precautions on how to repair the CAN bus lines
• If the CAN_L or CAN_H line on the main bus line
or branch line is repaired, renew all the twisted
wires between the end connectors. If the wiring
harness is partially repaired, or only CAN_L or
CAN_H line is repaired, noise suppression is
deteriorated, causing a communication error.
• If the connector or wire on the main bus line or
the branch wire is replaced, the frayed end of the
twisted wire should be within 10 cm (4.0 inches)
from the connector. If it exceeds 10 cm (4.0
inches), twist the wiring harness just like the orig-
inal twisted wire. If the frayed end exceeds 10 cm
(4.0 inches), noise suppression is deteriorated,
causing a communication error.
• If a branch wire is repaired, splice a new wire
directly into the main bus line. If a new wire is
spliced into the branch line, which is connected to
another device, a CAN communication error will
be caused.
.
Precautions on how to repair the terminator
resistor
If one-side terminator resistor is broken, the CAN
communication will continue although noise suppres-
sion is deteriorated. In this case, no DTC may be set.
Check the system regardless of whether a DTC is
set or not. If any damage is found, replace the termi-
nator resistor.
AC204696
ADDED WIRE
NO GOOD
AB
AC203824
CONNECTOR
TWISTED WIRE
AB
10 cm
(4.0 inches)
AC202856
ECU
ECU
ECU
ECU
GOOD
NO GOOD
TERMINATOR RESISTOR
OPEN
CIRCUIT
POINT
OPEN
CIRCUIT
POINT
TERMINATOR RESISTOR
AB
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-61
Diagnostic Item 1: CAN main bus line diagnostics
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 multimeter, the equipments connected through the CAN bus lines may be damaged.
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.
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.
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-62
AC204606
Can Bus Communication Circuit
AC204170
CONNECTOR: D-117
BS
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