Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 456

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-115

CIRCUIT OPERATION

•

A coil built into the output shaft speed sensor
generates 0

⇔

5 volts pulse signal at both ends

of this coil when the output shaft rotates. The
pulse signal frequency increases with a rise in
output shaft speed.

•

Both ends of the coil are connected to the PCM
(terminals 57 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.

DTC SET CONDITIONS
If the output from the output shaft speed sensor is
continuously 50 percent lower than the vehicle speed
for one second or more while driving in 3rd or 4th
gear at a speed of 30 km/h (19 mph) or more, it is
judged to be an open circuit or short-circuit in the
output shaft speed sensor and diagnostic trouble
code number "23" is output. If diagnostic trouble
code number "23" is output four times, the
transmission is locked into 3rd gear or 2nd gear as a
fail-safe measure, and the "N" range light flashes
once per second.

TROUBLESHOOTING HINTS (The most likely

causes for this code to be set:)

•

Malfunction of the output shaft speed sensor

•

Malfunction of the transfer drive gear or driven
gear

•

Damaged harness, connector

•

Malfunction of the PCM

DIAGNOSIS

Required Special Tool:
MB991502: Scan Tool (MUT-II)

AC001837AE

CONNECTOR: B-38

AC001741 AJ

CONNECTOR: C-28

AC001657

CONNECTORS: C-54 <2.4L ENGINE> OR
C-55 <3.0L ENGINE>, C-61 <2.4L ENGINE>
OR C-63 <3.0L ENGINE>

PCM

AM

C-54 <2.4L ENGINE>
OR
C-55 <3.0L ENGINE>

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

AC001691

CONNECTORS: C-101, C-107

C-101

JUNCTION BLOCK
(FRONT VIEW)

C-107

AN

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-117

STEP 3. Check connector C-54 <2.4L Engine> or C-55
<3.0L Engine> at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00, Harness

Connector Inspection

P.00E-2

.

STEP 4. Using scan tool MB991502, check data list item 23:
Output Shaft Speed Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991502 to the data reading mode for item

23: Output Shaft Speed Sensor.

•

When driving at constant speed of 50km/h (31mph), 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 "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : 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.

AC001657

CONNECTOR: C-54 <2.4L ENGINE> OR
C-55 <3.0L ENGINE>

PCM

AL

AC001252

MB991502

16 PIN

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-118

STEP 5. Check the sensor output voltage at PCM
connector C-61 <2.4L Engine> or C-63 <3.0L Engine> by
backprobing.
(1) Do not disconnect connector C-61 <2.4L Engine> or C-63

<3.0L Engine>.

(2) Disconnect connector B-38 at the output shaft speed

sensor.

(3) Turn the ignition switch to "ON" position.

(4) Measure the voltage between terminal 104 and ground by

backprobing.

•

Voltage should be between 4.8 and 5.2 volts.

(5) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 8.
NO : Go to Step 6.

STEP 6. Check connectors C-61 <2.4L Engine> or C-63
<3.0L Engine> at PCM and B-38 at output shaft speed
sensor for damage.
Q: Are the connectors in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

AC001657

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

PCM

AN

AC001811

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

AD

AC001657

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

PCM

AN

AC001837AE

CONNECTOR: B-38

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-119

STEP 7. Check harness for short circuit to ground between
PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine>
terminal 104 and output shaft speed sensor connector B-
38 terminal 2.
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair it.

AC001657

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

PCM

AN

AC001837AE

CONNECTOR: B-38