Mitsubishi Grandis. Manual — part 913
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-67
DIAGNOSIS
STEP 1. Voltage measurement at ABS-ECU
connector A-03.
(1) Disconnect the connector A-03, and connect
special tool ABS Check Harness (MB991974) to
the wiring harness-side connector.
NOTE: Do not connect special tool ABS Check
Harness (MB991974) to the ABS-ECU.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 20 and
earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Go to Step 2.
AC312620AK
Oil reservoir
Connector: A-03
ABS-ECU
MB991974
Check connector
A-03 Harness connector
A-03
Hydraulic unit
(with built-in ABS-ECU)
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-68
STEP 2. Check the following connectors.
•
ABS-ECU connector A-03
•
Junction block connectors C-202 and C-203
AC312621
Oil reservoir
Connector: A-03
AC
A-03
Hydraulic unit
(with built-in ABS-ECU)
A-03 Harness connector
(harness side)
AC313139
AB
C-203
Connectors: C-202, C-203
<L.H.drive vehicles>
C-202
C-202
C-203
1
3 4
2
6
5
6
1
7
2
9
8
10
3
5
12
11
4
1314
Junction block
(Front view)
AC313140
AB
C-203
Connectors: C-202, C-203
<R.H.drive vehicles>
C-202
C-202
C-203
1
3 4
2
6
5
6
1
7
2
9
8
10
3
5
12
11
4
1314
Junction block
(Front view)
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-69
•
Joint connector (6) C-01 <LH drive vehicles>, Joint
connector (7) C-33 <RH drive vehicles> and
intermediate connector C-124
•
Ignition switch connector C-307
Check the connectors, for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Is the check result normal?
YES :
An open or short circuit may be present in
the power supply line to the ABS-ECU.
Repair the wiring harness between
ABS-ECU connector A-03 terminal 20 and
ignition switch connector C-307 terminal 2.
Go to Step 8.
NO :
Repair or replace the damaged
component(s). Then go to Step 8.
STEP 3. Resistance measurement at ABS-ECU
connector A-03.
(1) Disconnect the connector A-03, and connect
special tool ABS Check Harness (MB991974) to
the wiring harness-side connector.
NOTE: Do not connect special tool ABS Check
Harness (MB991974) to the ABS-ECU.
(2) Measure the resistance between terminal 26 and
earth.
OK: 2 ohm or less
Q: Is the check result normal?
AC312624
33
22
11
28
17
16
15
14
13
12
25
2324
2627
3
1 2
4 5
21
20
19
18
2930
32
31
7
6
8
10
9
AC
Connectors: C-01, C-124
<L.H.drive vehicles>
C-01
C-01
C-124
C-124
AC312625AC
Connectors: C-33, C-124
<R.H.drive vehicles>
C-33
C-33
C-124
C-124
AC313147AB
Connector: C-307
<L.H.drive vehicles>
C-307
2
5
4
1
6
3
AC313148
AB
Connector: C-307
<R.H.drive vehicles>
C-307
2
5
4
1
6
3
AC312620AH
Oil reservoir
Connector: A-03
ABS-ECU
MB991974
Check connector
A-03 Harness connector
A-03
Hydraulic unit
(with built-in ABS-ECU)
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-70
YES :
Go to Step 5.
NO :
Go to Step 4.
STEP 4. Check ABS-ECU connector A-03 for
loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is the check result normal?
YES :
An open circuit may be present in the earth
circuit. Repair the wiring harness between
ABS-ECU connector A-03 terminals 26 and
the body earth. Then go to Step 8.
NO :
Repair or replace the damaged
component(s). Then go to Step 8.
STEP 5. Check the battery.
Check the battery (Refer to GROUP 54A, Battery
test
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Charge or replace the battery. Then go to
Step 8.
STEP 6. Check the charging system.
Check the charging system (Refer to GROUP 16,
Charging system
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair or replace the charging system
component(s).Then go to Step 8.
STEP 7. Retest the system.
Q: Can the ABS-ECU communicate with the MUT-III?
YES :
It can be assumed that this malfunction is
intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service
Points
− How to Cope with Intermittent
Malfunction
.
NO :
Replace the ABS-ECU. Then go to Step 8.
STEP 8. Retest the system.
Q: Can the ABS-ECU communicate with the MUT-III?
YES :
The procedure is complete.
NO :
Go to Step 1.
INSPECTION PROCEDURE 3: When the Ignition Switch is Turned to the "ON" Position (Engine
Stopped), the ABS Warning Lamp does not Illuminate.
INSPECTION PROCEDURE 4: The ABS Warning Lamp Remains Illuminated After the Engine is
Started.
OPERATION
• ABS-ECU send the illumination signal of ABS
warning lamp to the combination meter via the
CAN communication.
• ABS-ECU operates the ABS warning lamp and
the ABS warning lamp for three seconds after the
ignition switch is turned "ON" position for bulb
check.
COMMENT
This may be caused by faults in the CAN bus line,
the combination meter or the ABS-ECU.
PROBABLE CAUSES
• Malfunction of the combination meter
• Damaged harness, connector
• Malfunction of the ABS-ECU
AC312621
Oil reservoir
Connector: A-03
AC
A-03
Hydraulic unit
(with built-in ABS-ECU)
A-03 Harness connector
(harness side)
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