Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 588
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ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-43
ACTUATOR TEST SPECIFICATIONS
CHECK AT ABS-ECU
M1352011800093
TERMINAL VOLTAGE CHECK CHART
1. Measure the voltages between terminals (16) and
(19) (ground terminals) and each respective
terminal.
2. The terminal layouts are shown in the illustrations
below.
NOTE: Do not measure terminal voltage for
approximately three seconds after the ignition switch
is turned "ON." The ABS-ECU performs the initial
check during that period.
RESISTANCE AND CONTINUITY BETWEEN
HARNESS-SIDE CONNECTOR TERMINALS
1. Turn the ignition switch to the "LOCK" (OFF)
position and disconnect the ABS-ECU connectors
before checking resistance and continuity.
2. Check between the terminals indicated in the
table below.
3. The terminal layouts are shown in the illustration
below.
NO.
ITEM
PARTS TO BE
ACTIVATED
01
Solenoid valve for
front-left wheel
Solenoid valves and
pump motors in the
hydraulic unit (simple
inspection mode)
02
Solenoid valve for
front-right wheel
03
Solenoid valve for
rear-left wheel
04
Solenoid valve for
rear-right wheel
AC000971AC
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 DECREASES
HYDRAULIC PRESSURE HOLDS
HYDRAULIC PRESSURE INCREASES
AC002089 AB
CONNECTOR
TERMINAL NO
SIGNAL
CHECKING REQUIREMENT
NORMAL CONDITION
14
Input from stoplight
switch
Stoplight switch: ON
Battery positive voltage
Stoplight switch: OFF
Approximately 0 V
15
ABS-ECU power supply
Ignition switch: "ON"
Battery positive voltage
17
Motor power supply
Always
Battery positive voltage
18
Solenoid valve power
supply
Always
Battery positive voltage
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SPECIAL TOOLS
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-44
SPECIA L TO O LS
M1352000600073
AC002090 AB
CONNECTOR TERMINAL NO.
SIGNAL
NORMAL CONDITION
6
−
7
Front-left wheel speed sensor
1.28
−
1.92 k
Ω
1
−
3
Rear-right wheel speed sensor
1.28
−
1.92 k
Ω
4
−
5
Front-right wheel speed sensor
1.28
−
1.92 k
Ω
8
−
9
Rear-left wheel speed sensor
1.28
−
1.92 k
Ω
16
−
body ground
Solenoid valve ground
Less than 2 ohms
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991502
Scan tool (MUT-II)
MB991496-OD
For checking of ABS
(Diagnostic trouble code
display when using the
scan tool)
MB991529
Diagnostic trouble code
check harness
Tool not necessary if scan
tool (MUT-II) is available.
For checking of ABS
(Diagnostic trouble code
display when using the
ABS warning light)
MB991223
Harness set
A:MB991219
Inspection harness
B:MB991220
LED harness
C:MB991221
LED harness adaptor
D:MB991222
Probe
MB991223
MB991709-01
Making voltage and
resistance measurement
during troubleshooting
A: Connector pin contact
B: Power circuit
inspection
C: Power circuit
inspection
D: Commercial tester
connection
B991502
MB991529
MB991223
A
AB
B
C
D
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ON-VEHICLE SERVICE
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-45
O N -VEH IC LE SERVIC E
BLEEDING
M1352001500057
CAUTION
Use the specified brake fluid. Avoid using a mixture of the
specified brake fluid and other fluid.
Specified brake fluid: Conforming to DOT 3 or DOT 4
MASTER CYLINDER BLEEDING
Refer to GROUP 35A
−
On-vehicle Service
−
Bleeding
BRAKE LINE BLEEDING
CAUTION
Be sure to filter/strain the brake fluid being added to the
master cylinder reservoir tank. Debris may damage the
hydraulic unit.
Refer to GROUP 35A
−
On-vehicle Service
−
Bleeding
WHEEL SPEED SENSOR OUTPUT VOLTAGE
MEASUREMENT
M1352001600076
Required Special Tool:
MB991219: Inspection Harness
1. Lift up the vehicle and release the parking brake.
2. Disconnect the ABS-ECU connector, and then use special
tool MB991219 to measure the output voltage at the
harness side connector.
3. Manually turn the wheel to be measured 1/2 to 1 turn/
second. Measure the output voltage with a voltmeter or
oscilloscope.
Output voltage:
•
Minimal voltmeter reading: 42 mV
•
Maximum voltmeter reading: 300 mV
•
Minimal oscilloscope reading: 120 mV
•
Maximum oscilloscope reading: 600 mV
Probable causes of low output voltage
•
Wheel speed sensor pole piece-to-ABS rotor clearance too
large
•
Faulty wheel speed sensor
TERMINAL NO.
Front left
Rear right
Front right
Front left
6
1
4
8
7
3
5
9
AC000948 AB
ABS-ECU CONNECTOR
(HARNESS SIDE)
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ON-VEHICLE SERVICE
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-46
NOTE: Check the connection of the sensor harness and
connector before using the oscilloscope.
4. To observe the waveform with an oscilloscope:
•
Front Wheels: Shift into low gear and drive the wheels.
•
Rear Wheels: Turn the wheels manually at a constant
speed
NOTE: The output waveform is low when the wheel speed is
low. Similarly, it will be higher as the wheel speed increases.
Waveform may also be observed by driving the vehicle.
POINTS IN WAVEFORM MEASUREMENT
NOTE: The wheel speed sensor cable moves in relation to motion of the front or rear suspension. Therefore,
it is likely that it has an open circuit only when driving on rough roads but it functions normally when driving on
smooth roads. It is recommended to observe sensor output voltage waveform also under special conditions,
such as driving on a rough road.
AC000949 AB
WHEN TURNED MANUALLY
IN LOW GEAR, IDLING
[5
−
6 km/h (3
−
4 mph)]
[10.0 ms/DIV 1 V/DIV]
[10.0 ms/DIV 1 V/DIV]
SYMPTOM
PROBABLE CAUSES
REMEDY
Too small or zero waveform
amplitude
Faulty wheel speed sensor
Replace sensor
Incorrect pole piece-to-ABS rotor
clearance
Adjust clearance
Waveform amplitude fluctuates
excessively (This is no problem if
the minimum amplitude is 100 mV
or more)
Axle hub eccentric or with large
runout
Replace hub
Noisy or disturbed waveform
Open circuit in wheel speed sensor Replace sensor
Open circuit in harness
Repair harness
Incorrectly mounted wheel speed
sensor
Mount correctly
ABS rotor with missing or
damaged teeth
Replace ABS rotor
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