Mitsubishi 380. Manual - part 964

 

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Mitsubishi 380. Manual - part 964

 

 

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-81

INSPECTION PROCEDURE 5: Faulty ABS Operation

.

TECHNICAL DESCRIPTION (COMMENT)

The cause depends on driving and road surface con-
ditions, so diagnosis may be difficult. However, if no 
diagnostic trouble code is displayed, carry out the fol-
lowing inspection.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this case:)

• Malfunction of the hydraulic unit

Circuit drawings

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

.

DIAGNOSIS

STEP 1. Hydraulic unit check
 Refer to 

P.35B-90

.

Q: Is the hydraulic unit normal?

YES : Go to Step 2.
NO :  Connect the brake pipes correctly, repair the external 

brake lines, or replace the hydraulic unit.

STEP 2. Verify that the condition described by the 
customer exists.

Q: Can any faults be found with the brake operation?

YES : Check the brake system related components except 

the ABS system.

NO :  The procedure is complete.

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-82

DATA LIST REFERENCE TABLE

M1352011500780

The following items can be read by the diagnostic 
tool from the ABS-ECU input data.

MUT-III 
DIAGNOSTI
C TOOL 
DISPLAY

DATA 
LIST 
ITEM 
NO.

CHECK ITEM

CHECKING REQUIREMENTS

NORMAL 
VALUE

FL wheel 
speed sensor

01

Front-left wheel speed sensor

Drive the vehicle

Vehicle speeds 
displayed on the 
speedometer 
and diagnostic 
tool are identical.

FR wheel 
speed sensor

02

Front-right wheel speed sensor

RL wheel 
speed sensor

03

Rear-left wheel speed sensor

RR wheel 
speed sensor

04

Rear-right wheel speed sensor

Power supply 
voltage

05

ABS-ECU power supply voltage Ignition switch power supply 

voltage and valve monitor 
voltage

Battery positive 
voltage

Stop lamp 
switch (input)

06

Stoplamp switch

Depress the brake pedal.

ON

Release the brake pedal.

OFF

Stop lamp 
switch

13

Stoplamp switch

Depress the brake pedal.

ON

Release the brake pedal.

OFF

Pump motor

21

Pump motor

When the ABS outputs the 
operation permission signal 
during driving

ON

When the ABS outputs the 
operation permission signal 
during driving

OFF

Valve relay

30

Valve relay

When the ABS outputs the 
operation permission signal 
during driving

ON

When the ABS outputs the 
operation permission signal 
during driving

OFF

TCL mode

35

TCL operation

When the TCL outputs the 
operation permission signal 
during driving

ON

When the TCL outputs the 
operation inhibition signal 
during driving

OFF

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-83

ACTUATOR TEST REFERENCE TABLE

M1352011600765

The diagnostic tool activates the following actuators 
for testing.

NOTE: If the ABS-ECU runs down, actuator testing 
cannot be carried out.

NOTE: Actuator testing is only possible when the 
vehicle is stationary.

.

ACTUATOR TEST SPECIFICATIONS

NO.

ITEM

PARTS TO BE 
ACTIVATED

01

FL wheel speed sensor

Solenoid valves and 
pump motors in the 
hydraulic unit (simple 
inspection mode)

02

FR wheel speed sensor

03

RL wheel speed sensor

04

RR wheel speed sensor

09

Engine TCL Drive

Outputs the engine 
torque control signal 
(engine torque = 0) to 
Engine ECU for three 
seconds.

AC100172AI

ACTIVATION PATTERN

A
B
C

SOLENOID

VALVE

END OF

FORCED

ACTION

START OF

FORCED

ACTION

1 s

2 s

PUMP

MOTOR

ON

OFF

NOTE

A:

B:

C:

HYDRAULIC PRESSURE INCREASES

HYDRAULIC PRESSURE HOLDS

HYDRAULIC PRESSURE DECREASES

APPROXIMATELY

0.05 s

APPROXIMATELY

0.01 s

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-84

CHECK AT ABS-ECU

M1352011800769

.

TERMINAL VOLTAGE CHECK CHART

Required Special Tool:
MB991219: Inspection Test Harness
1. Disconnect the ABS-ECU connector A-02, and use special 

tool Inspection Test Harness (MB991219) to probe the 
wiring harness-side connector.

2. Measure the voltages between ground and each terminal 

listed below in the table. Also measure voltages between 
ground and each terminal listed below in the table.

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.

3. The terminal layouts are shown in the illustrations below.

.

CONNECTOR 
TERMINAL NO

SIGNAL

CHECKING REQUIREMENT

NORMAL 
CONDITION

3

Solenoid valve power 
supply

Always

Battery positive 
voltage

20

Stop light switch input Ignition 

switch: "ON" 

Stop light switch: "ON" 

Battery positive 
voltage

Stop light switch: "OFF" 

Approximately 0 V

2

Motor power supply

Always

Battery positive 
voltage

18

ABS-ECU power 
supply

Ignition switch: "ON" 

Battery positive 
voltage

Ignition switch: "START" 

Approximately 0 V

 

 

 

 

 

 

 

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