Mitsubishi Montero (2004+). Manual — part 1079
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-27
DTC 63, 64, 65, 71, 72, 73, 76, 77: Trouble in G and yaw rate sensor system
G and Yaw Rate Sensor Power Supply Circuit
AC204615
AC204170
CONNECTOR: D-01
AY
AC204173
CONNECTORS: D-208, D-212
D-208
D-212
AX
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-28
.
CIRCUIT OPERATION
The M-ASTC-ECU gathers information regarding lat-
eral and longitudinal gravities and yaw rate, through
the CAN bus line from the G and yaw rate sensor.
.
M-ASTC DTC SET CONDITION
DTC 62, 63, 64, 65, 71, 72, 73, 76 or 77 is set if the
M-ASTC-ECU detects any trouble in the G and yaw
rate sensor system. In this case, the G and yaw rate
sensor is sending data to the ECU, but the data con-
tains a fault.
.
TROUBLESHOOTING HINTS
The most likely causes for DTC 74 to set are:
• The G and yaw rate sensor is defective.
• Damaged harness wires and connectors
• 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
AC204176
CONNECTOR: E-111
AK
AC204175
CONNECTOR: E-126
AD
E-126(GR)
FLOOR
CONSOLE
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-29
STEP 1. Using scan tool MB991958, check data list.
(1) Confirm that the vehicle is not canted to one side or corner.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.
(4) Check that the G and yaw rate sensor output signal is
approximately 0 m/s
2
.
(5) Remove the G and yaw rate sensor with the wire and
connector attached.
(6) When the G and yaw rate sensor is inclined, the readings
on data list following items should change.
• Item 19: G SENSOR VOLT
• Item 20: G S(LATERAL)
• Item 22: G SENS VOLT 1
• Item 23: G SENS VOLT 2
Q: When the G and yaw rate sensor is inclined, do the
readings on data list following items should change?
YES : Go to Step 8.
NO : Go to Step 2.
STEP 2. Check the power supply system from the ignition
switch (IG1) to the G and yaw rate sensor. Measure at G
and yaw rate sensor connector E-126.
(1) Disconnect G and yaw rate sensor connector E-126, and
measure the voltage at the harness-side connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between G and yaw rate sensor
connector E-126 terminal 1 and body ground.
• The voltage should measure battery voltage (approxi-
mately 12 volts).
Q: Does the voltage measure battery voltage
(approximately 12 volts)?
YES : Go to Step 5.
NO : Go to Step 3.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AC204175
CONNECTOR: E-126
HARNESS SIDE
E-126(GR)
E-126(GR)
AB
FLOOR
CONSOLE
1
2
4 3
AC204580
HARNESS SIDE: E-126
AO
1
2
4 3
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-30
STEP 3. Check G and yaw rate sensor connector E-126.
Q: Is G and yaw rate sensor connector E-126 in good
condition?
YES : Go to Step 4.
NO : Repair or replace the connector, and then go to Step
STEP 4. Check the wiring harness between G and yaw rate
sensor connector E-126 terminal 1 and the ignition switch
(IG1).
AC204175
CONNECTOR: E-126
HARNESS SIDE
E-126(GR)
E-126(GR)
AB
FLOOR
CONSOLE
1
2
4 3
AC204175
CONNECTOR: E-126
HARNESS SIDE
E-126(GR)
E-126(GR)
AB
FLOOR
CONSOLE
1
2
4 3
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