Mitsubishi 380. Manual — part 947

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-13

STEP 2. Recheck for diagnostic trouble code.

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.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC C1200, C1205, C1210 or C1215 set?

YES : Go to Step 3
NO : The procedure is complete.

STEP 3. Using diagnostic tool MB991958, check data list.

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.
(1) Connect diagnostic tool MB991958 to the data link

connector.

(2) Start the engine.
(3) Set diagnostic tool MB991958 to the data reading mode,

and check the data list items by driving the vehicle.

• Item 01 (DTC C1205 is set): Front left wheel speed sen-

sor

• Item 02 (DTC C1200 is set): Front right wheel speed

sensor

• Item 03 (DTC C1215 is set): Rear left wheel speed sen-

sor

• Item 04 (DTC C1210 is set): Rear right wheel speed

sensor

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Does the speedometer indication match the diagnostic

tool indication?
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.00-14

.

NO : Go to Step 4.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-14

STEP 4. Measure supply voltage for wheel speed sensor
using an oscilloscope.
(1) ABS-ECU must remain connected.
(2) Remove ABS connector protection cap to access terminal

location from the rear of connector for back-probing.

(3) Using probe (MB991222) , backprobe the wheel speed

sensor voltage supply circuit terminals (16, 9, 6 and 8) at
the ABS-ECU connector (A-02) individually.

(4) Connect oscilloscope (as per figure 1) shows, to the

appropriate terminal positions and check supply voltage
individually with scope.

• If Item 01 (DTC C1205 is set): Connect oscilloscope to

FL sensor signal terminal (16) at ABS-ECU (A-02)

• If Item 02 (DTC C1200 is set): Connect oscilloscope to

FR sensor signal terminal (9) at ABS-ECU (A-02)

• If Item 03 (DTC C1215 is set): Connect oscilloscope to

RL sensor signal terminal (6) at ABS-ECU (A-02)

• If Item 04 (DTC C1210 is set): Connect oscilloscope to

RR sensor signal terminal (8) at ABS-ECU (A-02)

(5) Turn the ignition switch to the "ON" position.

(6) The recommended Supply Voltage at terminals 16, 9, 6,

and 8 are:

• Set value: 10.0Volts - 14.5Volts

Q: Is the supply voltage within the set value?

YES : Go to Step 5
NO :

• Refer to Power supply system

P.35B-63

• Refer to Motor supply system

P.35B-48

• Refer to Valve relay system

P.35B-56

OSCILLOSCOPE

ABS-ECU
(A-02)

Supply

Signal

WHEEL SPEED
SENSOR

Wheel speed sensor connectors:
A-04, A-01, D-31, D-30

Terminals:
16, 9, 6, 8

FIGURE 1

Red

Black

Ground

35DB121A

11-12V

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-15

STEP 5. Measure wheel speed sensor signals using an
oscilloscope.

NOTE: To check connections of the wheel speed sensors,
remove the rear seat to access the rear wheel speed sen-
sor connectors, and remove inner front guard (splash
shield) to access the front wheel speed sensors.

(1) Wheel speed sensor must remain connected to measure

active sensor.

(2) ABS-ECU must remain connected.
(3) Remove ABS connector protection cap to access terminal

location from the rear of connector for back-probing.

(4) Using probe (MB991222), backprobe the wheel speed

sensor signal circuit terminals (5, 10, 17, 19), and check
individually at the ABS-ECU connector A-02

(5) The wheel to be tested must be free to turn by hand or be

driven by brake dynamometer

(6) Connect oscilloscope (as per figure 2) shows, to the

appropriate terminal positions and check sensor operation
individually with scope.

• If Item 01 (DTC C1205 is set): Connect oscilloscope to

FL sensor signal terminal (5) at ABS-ECU (A-02)

• If Item 02 (DTC C1200 is set): Connect oscilloscope to

FR sensor signal terminal (10) at ABS-ECU (A-02)

• If Item 03 (DTC C1215 is set): Connect oscilloscope to

RL sensor signal terminal (17) at ABS-ECU (A-02)

• If Item 04 (DTC C1210 is set): Connect oscilloscope to

RR sensor signal terminal (19) at ABS-ECU (A-02)

(7) Recommended Oscilloscope setting:

• Y-axis: 2Volts

• X-axis: 100ms

(8) Turn the ignition switch to the "ON" position.
(9) Turn wheel by hand at approximately 1 revolution per

second (r/sec) or drive on brake dynamometer at 5km/h.

OSCILLOSCOPE

ABS-ECU
(A-02)

Supply

Signal

WHEEL SPEED
SENSOR

Wheel speed sensor connectors:
A-04, A-01, D-30, D-31

Terminals:
5, 10, 17, 19

FIGURE 2

Red

Black

Ground

35DB122A

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-16

Q: Does the oscilloscope measurement signal shape

correspond to the figure 3 below?

NOTE: If the oscilloscope signal shape is correct and wheel
sensor air gap is within specification, but the voltage values are
either higher or lower as shown in the table below, the wheel
speed sensor must be changed.

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.00-14

.

NO :

• FR sensor malfunction. Go to Step 6

• FL sensor malfunction. Go to Step 8

• RR sensor malfunction. Go to Step 10

• RL sensor malfunction. Go to Step 12

1.50

1.00

0.50

0.00

U-CH1

0

20

40

60

80

100

ms

V

Test Procedure: Universal Oscilloscope

FIGURE 3

35DB120A