Mitsubishi 380. Manual — part 962
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-73
STEP 1. Using diagnostic tool MB991958, diagnose the
CAN bus line.
CAUTION
To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958.
Use diagnostic tool MB991958 to diagnose the CAN bus lines.
(1) Connect diagnostic tool MB991958 to the data link
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?
YES : Check and repair the power supply circuit system
(Refer to
NO : Repair the CAN bus lines (Refer to GROUP 54C,
Diagnosis-CAN Bus Diagnostic Chart
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-74
INSPECTION PROCEDURE 2: Power Supply Circuit System
.
CIRCUIT OPERATION
• The ABS-ECU is energized by the ignition switch
(IG1) through multi-purpose fuse 19 and the
ABS-ECU terminal 18.
• If the power supply to the ABS-ECU has failed,
diagnostic tool (MUT-III Sub Assembly) will not
be able to communicate with it.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Damaged wiring harness or connector
• Defective battery
• Charging system failed
• Malfunction of the hydraulic unit (integrated with
ABS-ECU)
Circuit drawings
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
.
DIAGNOSIS
Required Special Tools:
• MB991958: Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
• MB991219: Inspection Test Harness
.
35DB090A
A
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-75
STEP 1. Measure the voltage at ABS-ECU connector A-02.
(1) Disconnect the connector A-02, and use special tool
Inspection Check Harness (MB991219) to probe the wiring
harness-side connector.
NOTE: The special tool (Inspection test harness)
MB991219 for connector pin contact pressure should be
used. The test probe should never be forcibly inserted, as it
may cause a defective contact.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 18 and ground. It
should measure approximately 12 volts (battery positive
voltage).
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 3.
NO : Go to Step 2.
35DB101A
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
TEST
HARNESS
(MB991219)
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-76
STEP 2. Check ABS-ECU connector A-02, junction block
connectors C-214, C-215 and ignition switch connector
C-308 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
• ABS-ECU connector A-02
• Junction block connectors C-214 and C-215
• Ignition switch connector C-308
Q: Are the connectors and terminals in good condition?
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-02 terminal
18 and ignition switch connector C-308 terminal 4.
Then go to Step 8.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
16DB402A
A-02 (GR)
CONNECTOR: A-02
A-02 HARNESS CONNECTOR:
35DB041A
CONNECTORS: C-214, C-215
C-215
1
3 4
2
6
5
C-214
6
1
7
2
9
8
10
3
5
12
11
4
1314
JUNCTION BLOCK
(FRONT VIEW)
35DB042A
CONNECTOR: C-308
C-308
2
5
4
1
6
3
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