Mitsubishi Galant 9G. Manual — part 1625
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-84
INSPECTION PROCEDURE 2: Power Supply Circuit System
.
CIRCUIT OPERATION
• The ABS-ECU is energized by the ignition switch
(IG1) through multi-purpose fuse 23 and the
ABS-ECU terminal 20.
• If the power supply to the ABS-ECU has failed,
scan 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)
JUNCTION
BLOCK
IGNITION
SWITCH (IG1)
POWER
SUPPLY
ABS-ECU
ABS-ECU Power Supply and Ground Circuit
AC304742
A-02 (GR)
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
AC
AC305415
CONNECTORS : C-214, C-215
C-214
C-215
AW
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-85
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
• MB991970: ABS Check Harness
.
STEP 1. Measure the voltage at ABS-ECU connector A-02.
(1) Disconnect the connector A-02, and connect special tool
ABS Check Harness (MB991970) to the wiring
harness-side connector.
NOTE: Do not connect special tool ABS Check Harness
(MB991970) to the ABS-ECU.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 20 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.
AC306403
19
2
18
1
8
9
7
6
5
4
3
10
11
25
15
16
17
27
28
26
12
13
14
23
24
22 21 20
A-02(GR)
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
AI
ABS-ECU
MB991970
CHECK CONNECTOR
A-02 HARNESS
CONNECTOR
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-86
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
AC306406
19
2
18
1
8
9
7
6
5
4
3
10
11
25
15
16
17
27
28
26
12
13
14
23
24
22 21 20
A-02 HARNESS CONNECTOR
(HARNESS SIDE)
AB
A-02 (GR)
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
AC305416AJ
C-214
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
C-215
JUNCTION BLOCK
(FRONT VIEW)
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-87
• 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
20 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
STEP 3. Measure the resistance at ABS-ECU connector
A-02.
(1) Disconnect the connector A-02, and connect special tool
ABS Check Harness (MB991970) to the wiring
harness-side connector.
NOTE: Do not connect special tool ABS Check Harness
(MB991970) to the ABS-ECU.
(2) Measure the resistance between terminal 2, 18 and ground.
It should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 5.
NO : Go to Step 4.
AC305235AG
CONNECTOR: C-308
C-308
2
5
4
1
6
3
AC306403
19
2
18
1
8
9
7
6
5
4
3
10
11
25
15
16
17
27
28
26
12
13
14
23
24
22 21 20
A-02(GR)
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
AH
ABS-ECU
MB991970
CHECK CONNECTOR
A-02 HARNESS
CONNECTOR
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