Mitsubishi Eclipse. Manual - part 780

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-129

STEP 15. Check PCM connector C-50 <2.4L Engine> or
C-52 <3.0L Engine> for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are the connector and terminals in good condition?

YES : Replace the PCM.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

STEP 16. Using the oscilloscope, check the input shaft
speed sensor waveform at PCM connectors C-50 <2.4L
Engine> or C-52 <3.0L Engine> and C-61 <2.4L Engine> or
C-63 <3.0L Engine> by backprobing.
(1) Do not disconnect connectors C-50 <2.4L Engine> or C-52

<3.0L Engine> and C-61 <2.4L Engine> or C-63 <3.0L
Engine>.

(2) Connect an oscilloscope probe to PCM connector C-50

<2.4L Engine> or C-52 <3.0L Engine> terminal 16 and to
PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine>
terminal 103 by backprobing.

(3) Start the engine and drive the vehicle at constant speed of

50 km/h (31 mph). (Gear range: 3rd gear)

(4) Check the input shaft speed sensor waveform.

• The input shaft speed sensor waveform should show a

pattern similar to the illustration. The maximum value
should be 4.8 volts and more and the minimum value
0.8 volt and less. The output waveform should not con-
tain electrical noise.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?

YES : Go to Step 19.
NO : Go to Step 17.

AC001657

CONNECTOR: C-50 <2.4L ENGINE> OR
C-52 <3.0L ENGINE>

PCM

C-50 <2.4L ENGINE> OR
C-52 <3.0L ENGINE>

AC001657

CONNECTORS: C-50 <2.4L ENGINE> OR
C-52 <3.0L ENGINE>, C-61 <2.4L ENGINE>
OR C-63 <3.0L ENGINE>

PCM

C-50 <2.4L ENGINE> OR
C-52 <3.0L ENGINE>

C-61 <2.4L ENGINE>
OR
C-63 <3.0L ENGINE>

AC100051

101

121

108

102

122

109 110

123

103

111

104

112
124

113
125

114 115

126 127

117

116

128

105

118

106 107

119
129

120

130

1
9

10 11
25

12
26

19
32

20 21
33

22
34

23
35

14
28

15 16
29

C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>
HARNESS CONNECTOR: HARNESS SIDE

C-50 <2.4L ENGINE> OR C-52 <3.0L ENGINE>
HARNESS CONNECTOR: HARNESS SIDE

PROBE

OSCILLO-
SCOPE

ACX02131

NORMAL WAVEFORM

(V)

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 17. Replace the input shaft speed sensor.
(1) Replace the input shaft speed sensor. Refer to GROUP

23B, Transaxle

P.23B-10

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is A/T DTC 22 set?

YES : Go to Step 18.
NO : The procedure is complete.

STEP 18. Replace the underdrive clutch retainer.
(1) Replace the underdrive clutch retainer. Refer to GROUP

23B, Underdrive Clutch and Input Shaft

P.23B-59

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is A/T DTC 22 set?

YES : An A/T DTC may have set due to external radio

frequency interference (RFI) possibility caused by
cellular phone activity, or aftermarket components
installed on the vehicle.

NO : The procedure is complete.

STEP 19. Using scan tool MB991958, check data list item
22: Input Shaft Speed Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991958 to data reading mode for item 22:

Input Shaft Speed Sensor.

• When driving at constant speed of 50 km/h (31 mph),

the display should be "1,600

− 1,900 r/min." <2.4L

Engine>, "1,300

− 1,600 r/min." <3.0L Engine> (Gear

range: 3rd gear)

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

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.00-6

NO : Replace the PCM.

AC001835

INPUT SHAFT
SPEED SENSOR

AC001836AB

AC303127

MB991911

16-PIN

MB991827

MB991824

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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DTC 23 (P0720): Output Shaft Speed Sensor System

AC106631

Output Shaft Speed Sensor System Circuit

AC001837AI

CONNECTOR: B-38

B-38

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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CIRCUIT OPERATION

• The output shaft speed sensor generates a 0 ⇔ 5

volt pulse signal when the output shaft rotates.
The pulse signal frequency increases with a rise
output shaft speed.

• The output shaft speed sensor is connected to

the PCM (terminals 16 and 104) via the output
shaft speed sensor connector (terminals 1 and 2).

• The PCM detects the output shaft speed by the

signal input to terminal 104.

• The output shaft speed sensor generates the

pulse signal as the teeth of the transfer drive gear
pass the magnetic tip of the sensor.

AC106611AB

CONNECTOR: C-28

C-28

AC001657

CONNECTORS: C-50 <2.4L ENGINE> OR
C-52 <3.0L ENGINE>, C-61 <2.4L ENGINE>
OR C-63 <3.0L ENGINE>

PCM

C-50 <2.4L ENGINE> OR
C-52 <3.0L ENGINE>

C-61 <2.4L ENGINE>
OR
C-63 <3.0L ENGINE>

AC106814AB

CONNECTORS: C-111, C-112

JUNCTION BLOCK
(FRONT VIEW)

C-111

C-112

C-111

C-112

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