Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 585

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-31

STEP 4. Check the harness wires between the ABS-ECU
connector A-02 and ground.
Q: Is any of the harness wires between the ABS-ECU

connector A-02 and ground damaged?
YES : Repair it and then go to Step 5.
NO : Go to Step 5.

STEP 5. Check symptoms.

Q: Does the scan tool communicate with the ABS system?

YES : This diagnosis is complete.
NO : Return to Step 1.

AC001985

CONNECTOR: A-02

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ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-32

INSPECTION PROCEDURE 2: When the Ignition Key is Turned to "ON" (Engine Stopped), the ABS
Warning Light does not Illuminate.

NOTE: CONNECTOR LOCK SWITCH
ON: The ABS-ECU connector A-02 is connected.

OFF: The ABS-ECU connector A-02 is disconnected.

ABS Warning Light Circuit

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-33

CIRCUIT OPERATION

•

The ABS warning light power is supplied from the
ignition switch. The ABS-ECU grounds the circuit
to illuminate the light.

•

The ABS-ECU illuminates the ABS warning light
for 3 seconds while running self-check. This light
can be illuminated for 3 seconds upon start-up or
when the ignition switch is turned to the "ON"
position with engine stopped.

•

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 may be: an open circuit in the ABS
warning light power supply circuit, a blown ABS
warning light bulb, or malfunction of the ABS-ECU.

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

•

Blown fuse

•

Damaged wiring harness or connector

•

Burnt out ABS warning light bulb

•

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

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the ABS warning light circuit at the ABS-
ECU connector A-02.
(1)Disconnect the ABS-ECU connector A-02.
(2)Turn the ignition switch to the "ON" position.

Q: Does the ABS warning light illuminate?

YES : Replace the hydraulic unit (integrated with ABS-ECU)

and then go to Step 9.

NO : Go to Step 2.

AC001985

CONNECTOR: A-02

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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

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-34

STEP 2 Check the ABS warning light bulb.
(1)Remove the combination meter (Refer to GROUP 54A,

Combination Meter

P.54A-66

and

P.54A-68

.)

(2)Check the ABS warning light bulb.

Q: Is the bulb burned out?

YES : Replace the bulb and then go to Step 9.
NO : Go to Step 3.

STEP 3. Check the combination meter for continuity.
(1)Remove the combination meter.
(2)Remove the ABS warning light bulb. Then measure the

resistance between the bulb terminals.

(3)Install the ABS warning light bulb to the combination meter,

and then measure the resistance between connector C-41
terminal 52 and connector C-42 terminal 24. The resistance
reading at this time should be much the same as the
resistance measured at step (2).

Q: Are the two resistance values extremely different each

other?
YES : Replace the combination meter (printed circuit board)

and then go to Step 9.

NO : Go to Step 4.

STEP 4. Check the combination meter power supply
circuit.
(1)Disconnect connector C-41, and check at the harness side.
(2)Turn the ignition switch to the "ON" position.
(3)Measure the voltage between terminal 52 and ground. It

should be approximately 12 volts (battery positive voltage).

Q: Is the voltage approximately 12 volts (battery positive

voltage)?
YES : Go to Step 5.
NO : Go to Step 7.

AC004480 AB

CONNECTOR C-41

CONNECTOR C-42

AC004482 AB

CONNECTOR: C-41

COMBINATION METER