Mitsubishi Montero (2004+). Manual — part 1084
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-47
STEP 8. Check the steering wheel sensor for ground
circuit. Measure at steering wheel sensor connector D-225.
(1) Disconnect steering wheel sensor connector D-225, and
measure the resistance at the harness-side connector.
(2) Measure the resistance between steering wheel sensor
connector D-225 terminal 5 and body ground.
• The resistance should measure 2 ohms or less.
Q: Does the resistance measure 2 ohms or less?
YES : Go to Step 10.
NO : Go to Step 9.
STEP 9. Check the wiring harness between steering wheel
sensor connector D-225 terminal 5 and the body ground.
Q: Is the wiring harness between steering wheel sensor
connector D-225 terminal 5 and the body ground in
good condition?
YES : Go to Step 11.
NO : Repair the wiring harness, and then go to Step 11.
STEP 10. Replace the steering wheel sensor (Recheck for
diagnostic trouble code).
Replace the steering wheel sensor, and check that the DTC
sets.
Q: Does DTC 67 reset?
YES : Replace the M-ASTC-ECU, and then go to Step 11.
NO : The procedure is complete.
STEP 11. Recheck for diagnostic trouble code.
Q: Does DTC 67 reset?
YES : Return to Step 1.
NO : The procedure is complete.
AC204172
CONNECTOR: D-225
HARNESS SIDE
AD
3 2
1
4
5
AC204581
3 2
1
4
5
HARNESS SIDE: D-225
AV
AC204172
CONNECTOR: D-225
HARNESS SIDE
AD
3 2
1
4
5
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-48
DTC 74: Communication error in G and yaw rate sensor
CAUTION
If the diagnostic trouble code(s), which indicate a communication error in the G and yaw rate sensor,
has been set, diagnose the CAN main bus line.
AC205075
G and Yaw Rate Sensor Communication Circuit
AB
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-49
.
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 74 is set if the M-ASTC-ECU cannot gather any
information from the G and yaw rate sensor.
.
TROUBLESHOOTING HINTS
The most likely causes for DTC 74 to set are:
• The CAN bus line is defective.
• Damaged connector(s)
• The G and yaw rate sensor is defective.
• 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
STEP 1. CAN main bus line diagnostics
CAUTION
If DTC 74 is set, diagnose the CAN main bus line.
Diagnose the CAN main bus line. Refer to
If the CAN main bus line is repaired, check that the diagnostic
trouble code resets.
Q: Have you completed checking or repairing the CAN
main bus line?
YES (If the CAN main bus line is repaired) : If the CAN
main bus line is repaired, go to Step 9.
YES (If the CAN main bus line is not defective) : If the
CAN main bus line is not defective, go to Step 2.
NO : Diagnose the CAN main bus line. Refer to
.
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-50
STEP 2. 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
(16-pin).
(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) 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 3.
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
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
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