Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 587

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-39

CIRCUIT OPERATION

•

The ABS-ECU controls the illumination of the
ABS warning light by turning the power transistor
in the control unit ON and OFF.

•

The ABS-ECU illuminates the ABS warning light
on start-up. It turns the light off after 3 seconds
when the ABS-ECU completes the self-check.

•

When the ABS-ECU connector is disconnected,
the circuit is grounded to illuminate the light by
the connector lock switch OFF operation.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably the ABS-ECU malfunction.

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

•

Malfunction of the ABS-ECU connector lock

•

Disconnection of the ABS-ECU connector

•

Damaged wiring harness or connector

•

Malfunction of the hydraulic unit (integrated with
ABS-ECU)

DIAGNOSIS
Confirm the ABS-ECU connector connection and locking. If the
connector is connected and locked to the ABS-ECU correctly,
perform the following diagnosis.

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the ABS warning light circuit at the
intermediate connector C-94.
(1)Disconnect the intermediate connector C-94.
(2)Turn the ignition switch to the "ON" position.

Q: Does the ABS warning light illuminate?

YES : Go to Step 4.
NO : Go to Step 2.

AC001985

CONNECTOR: A-02

AD

AC004428 AB

CONNECTORS: C-41, C-42

C-41

C-42

COMBINATION
METER

AC004410AB

CONNECTOR: C-94

AC004411AB

CONNECTORS: C-101, C-104

C-104

C-101

AC004410AB

CONNECTOR: C-94

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-40

STEP 2. Check the following connectors: the ABS-ECU
connector A-02 and the intermediate connector C-94.
Q: Is any of the connectors damaged?

YES : Repair it and then go to Step 6.
NO : Go to Step 3.

STEP 3. Check the harness wire between the ABS-ECU
connector A-02 and the intermediate connector C-94.
Q: Is the harness wire between the ABS-ECU connector A-

02 and the intermediate connector C-94 damaged?
YES : Repair it and then go to Step 6.
NO : Replace the hydraulic unit (integrated with ABS-ECU)

(Refer to

P.35B-51

.) and then go to Step 6.

AC001985

CONNECTOR: A-02

AD

AC004410AB

CONNECTOR: C-94

AC001985

CONNECTOR: A-02

AD

AC004410AB

CONNECTOR: C-94

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-41

STEP 4. Check the following connectors: the combination
meter connector C-42 and the intermediate connector C-
94.
Q: Is any of the connectors damaged?

YES : Repair it and then go to Step 6.
NO : Go to Step 5.

STEP 5. Check the harness wire between the combination
meter connector C-42 and the intermediate connector C-
94.
Q: Is the harness wire between the combination meter

connector C-42 and the intermediate connector C-94
damaged?
YES : Repair it and then go to Step 6.
NO : Replace the combination meter (printed circuit board)

(Refer to GROUP 54A, Combination Meter

P.54A-66

and

P.54A-68

.) and then go to Step 6.

AC004483AB

CONNECTOR: C-42

COMBINATION
METER

AC004410AB

CONNECTOR: C-94

AC004483AB

CONNECTOR: C-42

COMBINATION
METER

AC004410AB

CONNECTOR: C-94

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-42

STEP 6. Check symptoms.

Q: Does the ABS warning light turn off 3 seconds after

start-up?
YES : This diagnosis is complete.
NO : Return to Step 1.

INSPECTION PROCEDURE 4: Faulty ABS Operation

TECHNICAL DESCRIPTION (COMMENT)
The cause depends on driving and road surface
conditions, so diagnosis may be difficult. However, if
no diagnostic trouble code is displayed, carry out the
following inspection.

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

•

Malfunction of the hydraulic unit

DIAGNOSIS
Check the hydraulic unit. (Refer to

P.35B-47

.) If the hydraulic

unit (integrated with ABS-ECU) is malfunctioning, replace it.
Then check that the malfunction symptom is eliminated.

DATA LIST REFERENCE TABLE

M1352011500092

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

ACTUATOR TEST REFERENCE TABLE

M1352011600077

The scan tool activates the following actuators for
testing.

NOTE: If the ABS-ECU is inoperative, actuator
testing cannot be carried out.

NOTE: Actuator testing is only possible when the
vehicle is stationary. If the vehicle speed during
actuator testing exceeds 10 km/h (6 mph), forced
actuation will be canceled.

MUT-II SCAN
TOOL
DISPLAY

ITEM
NO.

CHECK ITEM

CHECKING REQUIREMENTS

NORMAL
VALUE

FR SNSR

11

Front-right wheel speed sensor

Drive the vehicle

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

FL SNSR

12

Front-left wheel speed sensor

RR SNSR

13

Rear-right wheel speed sensor

RL SNSR

14

Rear-left wheel speed sensor

BATT.
VOLTAGE

16

ABS-ECU power supply voltage Ignition switch power supply

voltage and valve monitor
voltage

9

−

16 V

STOPLIGHT
SW

36

Stoplight switch

Depress the brake pedal.

ON

Release the brake pedal.

OFF