Mitsubishi Montero (2002-2004). Manual — part 1061
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-115
CHECK AT M-ASTC-ECU
M1352011800402
TERMINAL VOLTAGE CHECK CHART
NOTE: There are two ECUs with the same shape inside the
floor console, one above the other. The upper ECU is the M-
ASTC-ECU. The lower ECU is the transfer-ECU.
NOTE: Do not measure terminal voltage for approximately
three seconds after the ignition switch is turned "ON." The M-
ASTC-ECU performs the initial check during that period.
1. Measure the voltages between terminals (4), (12), (56) or
(64) (ground terminals) and each respective terminal.
2. The terminal layouts are shown in the illustrations.
AC203901
AC204627AY
M-ASTC-ECU
M-ASTC-ECU CONNECTORS
TRANSFER-ECU
CONNECTOR
TERMINAL
NO.
SIGNAL
CHECKING REQUIREMENT
NORMAL
CONDITION
1
Control solenoid valve
OUT (Rear right wheel)
Ignition switch: ON
Battery positive
voltage
2
Control solenoid valve IN
(Rear right wheel)
Ignition switch: ON
Battery positive
voltage
3
Control solenoid valve
OUT (Front left wheel)
Ignition switch: ON
Battery positive
voltage
5
PI valve
Ignition switch: ON
Battery positive
voltage
6
Cut valve
Ignition switch: ON
Battery positive
voltage
7
Select solenoid valve
(Front right wheel)
Ignition switch: ON
Battery positive
voltage
8
Select solenoid valve
(Front left wheel)
Ignition switch: ON
Battery positive
voltage
10
Control solenoid valve IN
(Front left wheel)
Ignition switch: ON
Battery positive
voltage
19
Stoplight switch input
Stoplight switch: ON
Battery positive
voltage
Stoplight switch: OFF
2 V or less
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-116
24
M-ASTC-ECU power
supply
Ignition switch: ON
Battery positive
voltage
42
Control solenoid valve IN
(Front right wheel)
Ignition switch: ON
Battery positive
voltage
43
Control solenoid valve
OUT (Front right wheel)
Ignition switch: ON
Battery positive
voltage
44
Control solenoid valve IN
(Rear left)
Ignition switch: ON
Battery positive
voltage
45
Control solenoid valve
OUT (Rear light wheel)
Ignition switch: ON
Battery positive
voltage
50
Pressure sensor power
supply
Ignition switch: ON
Approximately 5 V
55
Valve relay monitor
Ignition switch: ON
Battery positive
voltage
59
Pressure sensor
Ignition switch: ON
Approximately
0.14
− 4.85 V
62
ABS warning light output Ignition switch:
ON
When light is switched off Battery positive
voltage
When light is illuminated
2 V or less
74
Active skid control
system operation
warning light output
Ignition switch:
ON
When light is switched off Battery positive
voltage
When light is illuminated
2 V or less
75
2WD/4WD detection
switch input
Ignition switch:
ON
Transfer selector lever
position: 2H, 4H
Battery positive
voltage
Transfer selector lever
position: 4HLc, 4LLc
2 V or less
76
4LLc detection switch
input
Ignition switch:
ON
Transfer selector lever
position: 4LLc
Battery positive
voltage
Transfer selector lever
position: 2H, 4H, 4HLc
2 V or less
80
Center differential lock
switch input
Ignition switch:
ON
Transfer selector lever
position: 2H, 4H
Battery positive
voltage
Transfer selector lever
position: 4HLc, 4LLc
2 V or less
81
Brake warning light
output
Ignition switch:
ON
When light is switched off 2 V or less
When light is illuminated
Battery positive
voltage
CONNECTOR
TERMINAL
NO.
SIGNAL
CHECKING REQUIREMENT
NORMAL
CONDITION
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-117
RESISTANCE AND CONTINUITY BETWEEN
HARNESS-SIDE CONNECTOR TERMINALS
NOTE: There are two ECUs with the same shape inside the
floor console, one above the other. The upper ECU is the M-
ASTC-ECU and has a blue connector. The lower ECU is the
transfer-ECU and has a green connector.
1. Turn the ignition switch to the "LOCK" (OFF) position and
disconnect the M-ASTC-ECU.
2. Check between the terminals indicated in the table below.
3. The terminal layouts are shown in the illustration.
86
2WD detection switch
input
Ignition switch:
ON
Transfer selector lever
position: 2H
Battery positive
voltage
Transfer selector lever
position: 4H, 4HLc, 4LLc
2 V or less
87
4H detection switch input Ignition switch:
ON
Transfer selector lever
position: 2H, 4LLc
Battery positive
voltage
Transfer selector lever
position: 4H, 4HLc
2 V or less
CONNECTOR
TERMINAL
NO.
SIGNAL
CHECKING REQUIREMENT
NORMAL
CONDITION
AC203901
AC204627AY
M-ASTC-ECU
M-ASTC-ECU CONNECTORS
TRANSFER-ECU
CONNECTOR
TERMINAL NO.
SIGNAL
NORMAL CONDITION
30
− 31
Front-left ABS sensor
1.0
− 1.5 kΩ
60
− 61
Rear-right ABS sensor
1.0
− 1.5 kΩ
46
− 47
Rear-left ABS sensor
1.0
− 1.5 kΩ
27
− 28
Front-right ABS sensor
1.0
− 1.5 kΩ
4
− body ground
Ground
Less than 2 ohms
22
− body ground
Ground
Less than 2 ohms
56
− body ground
Ground
Less than 2 ohms
64
− body ground
Ground
Less than 2 ohms
SPECIAL TOOLS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-118
SPECIAL TOOLS
M1352000600426
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991502
Scan tool (MUT-II)
MB991496-OD
For checking of ABS
[Diagnostic trouble code
display when using the
scan tool (MUT-II)]
MB991348
Test harness set
MB991496-OD
For checking of G and
yawrate sensor
MB991223
Harness set
A:MB991219
Inspection harness
MB991223
MB991709-01
ABS sensor output
voltage measurement
B991502
MB991348
MB991223
A
AB
B
C
D
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