Mitsubishi Grandis. Manual — part 911

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-59

STEP 8. 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 :

Go to Step 1.

NO :

The procedure is complete.

Code No.U1073: Bus off

CAUTION

• If diagnosis code U1073 is set in the

ABS-ECU, always diagnose the CAN main bus
line. If there is any fault in the CAN bus lines,
an incorrect diagnosis code may be set.

• Whenever the ECU is replaced, ensure that

the communication circuit is normal.

TROUBLE JUDGMENT

This code is stored when the ABS-ECU has ceased
the CAN communication (bus off). Then, if a penalty
mode is entered after approximately five minutes,
regular data transmission will be cancelled.

PROBABLE CAUSES

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with

ABS-ECU)

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-60

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 2.

NO :

Repair the CAN bus line (Refer to GROUP
54D, CAN bus line Diagnostic flow

P.54D-9

). Then go to Step 2.

STEP 2. MUT-III diagnosis code

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.U1073 set?

YES :

Replace the hydraulic unit (integrated with

ABS - ECU). Then go to Step 3.

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

P.00-5

.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-61

STEP 3. Check whether the diagnosis code is
reset.

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.U1073 set?

YES :

Go to Step 1.

NO :

The procedure is complete.

INSPECTION CHART FOR TROUBLE
SYMPTOMS

M1352011400761

NOTE: If steering movements are made when
driving at high speed, or when driving on road
surfaces with low frictional resistance, or when
passing over bumps, the ABS may operate although
sudden braking is not being applied. Because of this,
when getting information from the customer, check if
the problem occurred while driving under such
conditions as these.
NOTE: During ABS operation, the brake pedal may
vibrate a little or may not be able to be pressed. Such
conditions are due to intermittent changes in
hydraulic pressure inside the brake line to prevent
the wheels from locking. This is normal.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

Symptom

Inspection procedure No. Reference page

Communication between MUT-III and the ABS-ECU
is not possible.

1

P.35B-62

ABS-ECU power supply circuit system

2

P.35B-65

When the ignition switch is turned to the "ON"
position (Engine stopped), the ABS warning lamp
does not illuminate.

3

P.35B-70

The ABS warning lamp remains illuminated after the
engine is started.

4

P.35B-70

Faulty ABS operation

5

P.35B-72

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-62

INSPECTION PROCEDURE FOR
TROUBLE SYMPTOMS

INSPECTION PROCEDURE 1: Communication between Scan Tool and the ABS-ECU is not possible.

<LH drive vehicles>

IGNITION
SWITCH (IG1)

DIAGNOSIS
CONNECTOR

FRONT SIDE

POWER
SUPPLY

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet

21

AC313152

ABS-ECU

13

26

20

Data Link Connector Circuit

AB