Mitsubishi Grandis. Manual — part 910
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-55
DIAGNOSIS
STEP 1. MUT-III CAN bus diagnostics
CAUTION
Before connecting or disconnecting the MUT-III,
turn the ignition switch to the "LOCK" (OFF)
position.
(1) Connect MUT-III to the 16-pin diagnosis
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the CAN bus line (Refer to GROUP
54D, CAN bus line Diagnostic flow
). Then go to Step 2.
STEP 2. MUT-III diagnosis code
CAUTION
Before connecting or disconnecting the MUT-III,
turn the ignition switch to the "LOCK" (OFF)
position.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)
position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is code No.C1860 or C1861 set?
YES :
Go to Step 3.
NO :
The procedure is complete.
STEP 3. Check the battery.
Check the battery (Refer to GROUP 54A, Battery
test
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Charge or replace the battery.
STEP 4. Check the charging system.
Check the charging system (Refer to GROUP 16,
Charging system
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair or replace the charging system
component(s).
AC302297
AC310120
AB
MB991827
16-pin
MB991910
MB991824
AC302297
AC310120
AB
MB991827
16-pin
MB991910
MB991824
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-56
STEP 5. 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 7.
NO :
Go to Step 6.
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-57
STEP 6. 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-58
•
Joint connector C-01 <LH drive vehicles> or 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.
Then go to Step 8.
NO :
Repair or replace the damaged
component(s). Then go to Step 8.
STEP 7. Check whether the diagnosis code is
reset.
CAUTION
Before connecting or disconnecting the MUT-III,
turn the ignition switch to the "LOCK" (OFF)
position.
Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)
position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is code No.C1860 or C1861 set?
YES :
Replace the hydraulic unit (integrated with
ABS-ECU). Then go to Step 8.
NO :
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
.
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
AC302297
AC310120
AB
MB991827
16-pin
MB991910
MB991824
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