Mitsubishi Montero (2004+). Manual — part 1068
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-115
Q: Is the harness wire between combination meter
connector D-03 terminal 56 and M-ASTC-ECU connector
E-106 terminal 62 damaged?
YES : Repair it and then go to Step 3.
NO : This malfunction is intermittent. Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
− How to Cope with Intermittent Malfunction
.
STEP 3. Retest the system.
Q: Does the ABS warning light illuminate for 3 seconds
when the ignition switch is turned to the "ON" position
with engine stopped or upon start-up?
YES : The procedure is complete.
NO : Return to Step 1.
INSPECTION PROCEDURE 6: Faulty ABS Operation
.
TECHNICAL DESCRIPTION (COMMENT)
The cause depends on driving and road surface con-
ditions, so diagnosis may be difficult. However, if no
diagnostic trouble code is displayed, carry out the fol-
lowing inspection.
.
TROUBLESHOOTING HINTS
• Malfunction of the hydraulic brake booster (HBB)
.
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
STEP 1. Check the HBB hydraulic unit.
Check the operation of HBB hydraulic unit. Refer to
.
Q: Does HBB hydraulic unit operate normally?
YES : Intermittent malfunction of the vehicle speed sensor is
assumed to be the cause. Refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points
−
How to Cope With Intermittent Malfunction
.
Then go to Step 2.
NO : Replace the HBB master cylinder and hydraulic unit
assembly and go to Step 2.
STEP 2. Retest the system.
Q: Do the brakes operate normally?
YES : The procedure is complete.
NO : Return to Step 1.
AC204385
CONNECTOR: E-110
AD
E-110
6
1
7
2
9
8
10
3
5
12
11
4
1314
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-116
DATA LIST REFERENCE TABLE
M1352011500638
The following items can be read by the scan tool
from the M-ASTC-ECU input data.
MUT-III
SCAN TOOL
DISPLAY*
ITEM
NO.
CHECK ITEM
CHECKING REQUIREMENTS
NORMAL VALUE
ACCUM
SW(PH)
77
Accumulator switch (PH) Accumulator fluid pressure
reduces to less than approx. 16.1
MPa
ON
Accumulator fluid pressure
reaches approx. 18.3 MPa
OFF
ACCUM
SW(PL)
76
Accumulator switch (PL) Accumulator fluid pressure
reduces to approx. 10.8 MPa or
less.
ON
M-ASTC OFF
SW
37
Active skid control
switch
Set the active skid control switch
to the neutral position
OFF
Turn the active skid control switch
to the OFF position
ON
M-ASTC ON
SW
38
Active skid control
switch
Set the active skid control switch
to the neutral position
OFF
Turn the active skid control switch
to the ON position
ON
BATT.
VOLTAGE
31
M-ASTC-ECU power
supply voltage
Ignition switch power supply
voltage and valve monitor voltage
6.5
− 22.3 V
ENGINE
SPEED
17
Engine speed
Drive the vehicle
The scan tool and the
tachometer readings
are approximately the
same
EN.
TYPE/DEST
N
28
Engine model and
destination
−
6G75 NAS
FR SNSR
11
Front right ABS sensor
Drive the vehicle
Vehicle speeds
displayed on the
speedometer and
scan tool are identical.
FL SNSR
12
Front left ABS sensor
G SENS
VOLT 1
22
Output 1 from G sensor Drive the vehicle
-14.7
− 14.7 m/s
2
G SENS
VOLT 2
23
Output 2 from G sensor
G SENSOR
VOLT
19
Output from G sensor
(longitudinal
acceleration)
G
S(LATERAL)
20
Output from G sensor
(lateral acceleration)
IDLE POS.
SW
75
Closed throttle position
switch
Do not depress the accelerator
pedal
ON
Depress the accelerator pedal
OFF
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-117
TR SWITCH
26
Transmission range
switch
Drive the vehicle
The shift lever position
indicator and the scan
tool readings are
equal
M/C PRESS.
SNSR
24
Master cylinder pressure
sensor
When depressing gradually the
brake pedal, the output value will
change.
Approximately 0.5 -
4.5 V
MOTOR RLY 79
Motor relay
Motor relay is operating
ON
Motor relay is not operating
OFF
RR SNSR
13
Rear right ABS sensor
Drive the vehicle
Vehicle speeds
displayed on the
speedometer and
scan tool are identical.
RL SNSR
14
Rear left ABS sensor
SHIFT
POSIT.
27
Shift position
Drive the vehicle
The shift lever position
indicator and the scan
tool readings are
equal
ST ANGLE
32
Steering wheel angle
Steering wheel angle
deg (approximately
the same as actual
steering wheel angle)
STOPLIGHT
SW
36
Stoplight switch
Depress the brake pedal.
ON
Release the brake pedal.
OFF
T/F MODE
30
Transfer position
Drive the vehicle.
the same as actual
transfer position
VALVE RLY
78
Valve relay
Valve relay is operating
ON
Valve relay is not operating
OFF
MUT-III
SCAN TOOL
DISPLAY*
ITEM
NO.
CHECK ITEM
CHECKING REQUIREMENTS
NORMAL VALUE
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-118
ACTUATOR TEST REFERENCE
M1352011600635
CAUTION
When performing the item No.09 [AIR BLEEDING
(1)] consecutively, keep the interval of 20 sec-
onds or more between respective bleeding oper-
ations.
The scan tool activates the following actuators for
testing.
NOTE: If the M-ASTC-ECU is inoperative, actuator
testing cannot be carried out.
NOTE: Actuator testing is only possible when the
vehicle is stationary. If the vehicle speed during actu-
ator testing exceeds 10 km/h (6 mph), forced actua-
tion will be canceled.
ACTUATOR TEST SPECIFICATIONS
MUT-III SCAN
TOOL DISPLAY
ITEM
NO.
CHECK ITEM
PARTS TO BE
ACTIVATED
Activation
when the
system fails
FR ABS VALVE
01
Solenoid valve for front-right wheel HBB select solenoid valves
and control solenoid valves
for the respective channel
Disabled
FL ABS VALVE
02
Solenoid valve for front-left wheel
RR ABS VALVE
03
Solenoid valve for rear-right wheel
RL ABS VALVE
04
Solenoid valve for rear-left wheel
ABS AIR B.1
09
Air bleeding (1)
HBB select solenoid valves
and control solenoid valve
OUT (FR, FL)
Disabled
ABS AIR B.2
10
Air bleeding (2)
HBB control solenoid valve
OUT (RR, RL)
Disabled
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