Mitsubishi Eclipse. Manual - part 771

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-93

STEP 6. Using scan tool MB991958, check data list item 15: 
Transmission Fluid Temperature 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 15: 

Transmission Fluid Temperature Sensor.

• When the engine is cool: Almost equal to the ambient 

temperature (atmospheric temperature)
NOTE: Set scan tool MB991958 to data reading mode 
for item number 13, Intake Air Temperature (IAT) Sensor 
and note the temperature measurement. When the 
engine is cool, the temperature should be almost equal 
to the ambient temperature (atmospheric temperature), 
and the IAT sensor measurement should be approxi-
mately the same as the Transmission Fluid Temperature 
Sensor.

• When the engine is warm: 70 to 80°C (158 to 176°F)

(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.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-94

STEP 7. Measure 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) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 124 and ground by 

backprobing.

• When transmission fluid temperature is 20°C (68°F), 

voltage should measure between 3.8 and 4.0 volts.

• When transmission fluid temperature is 40°C (104°F), 

voltage should measure between 3.2 and 3.4 volts.

• When transmission fluid temperature is 80°C (176°F), 

voltage should measure between 1.7 and 1.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

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

STEP 8. Check PCM connector C-61 <2.4L Engine> or C-63 
<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 : Go to Step 9.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

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

BD

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

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

AC001792

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

HARNESS CONNECTOR:
HARNESS SIDE

AN

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

BD

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

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

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-95

STEP 9. Check the harness for a short circuit to ground 
between A/T control solenoid valve connector B-40 
terminal 1 and PCM connector C-61 <2.4L Engine> or C-63 
<3.0L Engine> terminal 124.
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO :  Repair or replace the harness wire.

ACX02479

CONNECTOR: B-40

AK

B-40

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

BD

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

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

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-96

DTC 21: Crankshaft Position Sensor System

AC106629 AB

AC102214

A-18X

AE

CONNECTOR: A-18X

FRONT OF
VEHICLE 

BATTERY

2

1

3

4

AC004926AC

CONNECTOR: B-20
<2.4L ENGINE>

B-20