Mitsubishi Eclipse. Technical Information Manual (1994) - part 66

DRIVE-CONTROL COMPONENTS   ABS 

3. Diagnostic Trouble Code Clearing Procedure

NOTE
(1) When the ABS-ECU system is out of order,

the diagnostic trouble codes in the memory can-

not be cleared by use of the scan tool.

(2) To check whether the memory has been cleared,

the diagnostic trouble code reading procedure
should be performed.

<When the scan tool is used>
Clear the memory according to the message that
appears on the scan tool. (For details, refer to the

 scan tool is not used>

To erase the trouble codes in memory, place the
stop light switch in the ON state and then set the

ignition switch to ON (generator terminal L voltage:
LOW) and change over the stop light switch 

(3) Even after the memory has been cleared, an

instruction from the scan tool can be accepted.

 a diagnostic trouble code, the scan

tool should be re-operated.

instruction manual for the scan tool.)

times within the following time intervals. The trouble
codes in memory will then be erased in about a
second.

Ignition 

switch

OFF

I

Generator HI

I

terminal

I

L voltage

LOW 

Stop light 

I

switch

 

I

 

 or 

I

1st

4th

9th

I

I

I

J

Warning

ON

light

OFF

1 sec.

ABS-ECU

memory

1 sec.

Erasure 

 

If any of the following conditions is true, the trouble

codes in memory will not erase.

l

When the stop light switch is not ON before

the ignition switch is set to ON

l

When the first stop light switch input change

(ON-OFF) does not occur in less than three

seconds, or when the second and subsequent
change does not occur in less than one second

l 

When the generator terminal L voltage goes

“HI” before erasure is completed

 

    A B S  

Data List Output
Of the ABS-ECU 

input data, the following items can be read by the scan tool.

1. When the System is in Order

Code No.

Items

Displayed unit

11

Front right wheel speed

km/H

12

Front left wheel speed

km/H

13

Rear right wheel speed

km/H

14

Rear left wheel speed

km/H

21

ABS-ECU power voltage

22

Generator power voltage

23

Stop light switch ON/OFF state

ON/OFF

2. When the System is in the ABS-ECU Isolated State

When the ABS-ECU is placed in the out of service

not displayed. The data displayed by the scan tool

state by the on-board diagnostic program, the wheel

is always “0.0 km/h (0 mph)“.

speeds of No. 11 through 14 described above are

Actuator Test
The actuator can be force-driven using the scan

actuator testing exceeds 10 km/h (6 mph),

tool for easy operation inspection.

forced actuation will be cancelled.

NOTE

(3) The following item numbers are those to be

(1) If the ABS-ECU function has been cancelled,

entered on the scan tool to give an actuator

an actuator test cannot be performed.

test instruction.

(2) Actuator testing is only possible when the ve-

hicle is stationary. If the vehicle speed during

Item No.

01

02

03

Drive object

Drive pattern

F.R. solenoid valve

and pump motor

Increase in

Solenoid
valve

F.L. solenoid valve

and pump motor

Rear solenoid valve

and pump motor

Pump
motor

Start of forced actuation

End of forced actuation

SYSTEM OPERATION

Refer to 1991 3000GT Technical Information Manual (Pub. No. PXSE9001).

DRIVE-CONTROL COMPONENTS   ABS 

ANTI-LOCK   BRAKE   SYSTEM  (ABS)  <AWD>

N73ZNaQM

The ABS used in the 1995 Eclipse is similar to
the previous one.

The AWD version ABS is a  4-sensor,  2-channel

Combining the ABS with the AWD system has  signifi-

type and is the same as the FWD system except

cantly improved the “stopping” as well as “running”

for the following respects.

performance of the AWD vehicles. It assures a high

l 

Wheel speed sensor rotor (rear) press-fitted

in drive shaft

level of running performance under any conditions,
not only on a dry pavement but also on a slippery
road surface.

Gap adjustment-free wheel speed sensor and
rotor

l 

Semiconductor type G sensor

4 7

6

Part name

Wheel speed sensor

No.

Function

1

Sends an AC signal with a frequency proportional to the ro-
tating speed of the individual wheel to the ABS-ECU.

Sensor

G-sensor

2

Sends an ON/OFF signal to the ABS-ECU depending on
vehicle acceleration/deceleration.

Stop light switch

3

Sends a signal to the ABS-ECU indicating whether the
brake pedal is pressed or not.

Actuator

Hydraulic unit (HU)

ABS power relay

Motor relay

Valve relay

Controls braking pressure for each wheel depending on the

4

signal from the ABS-ECU.

Includes built-in select-low valve

5

Supplies power to the ABS-ECU.

6

Closes contact in response to a signal from the ABS-ECU to
allow the power to be supplied to the motor in the HU.

7

Is turned ON by the ABS-ECU signal and supplies power to

the solenoid valve in HU.

ABS warning light

8

Is in the combination meter and lights up when there is

trouble in ABS.

Data link connector

Electronic control unit (ECU)

9

Outputs diagnostic trouble codes.

10

Controls the actuators such as HU according to the signals
from the individual sensors.

DRIVE-CONTROL  COMPONENTS

 -  A B S  

<AWD>

3-45

SYSTEM   DRAWING

Wheel speed sensor (FL)

FL solenoid valve

1

Wheel speed sensor 

Wheel speed sensor (RR)

FR solenoid valve

ABS valve relay

ABS motor relay

ABS valve relay response signal-

 

  m o t o r   r e s p o n s e   s i g n a l  

 

 

G sensor

Stop light switch

 ECU power 

Stop light switch

I

Rear right wheel (RR)

sensor

 

 

 

 

 

unit (HU)

I

Wheel speed sensor

 

valve

 

Front right wheel (FR)

G sensor

ABS

Rear left wheel (RL)

Front left wheel (FL)