Mitsubishi Grandis. Manual - part 913

 

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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 

P.54A-6

).

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 

P.16-5

).

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 

P.00-5

.

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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