Mitsubishi Eclipse. Manual - part 778

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-121

STEP 2. Measure the power supply voltage at the input 
shaft speed sensor connector B-42.
(1) Disconnect connector B-42 and measure at the harness 

side.

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

(3) Measure the voltage between terminal 3 and ground.

• The voltage should measure battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?

YES : Go to Step 5.
NO :  Go to Step 3.

AC001835

CONNECTOR: B-42

AH

B-42

ACX02126AN

B-112 HARNESS
CONNECTOR:
COMPONENT SIDE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-122

STEP 3. Check intermediate connector C-28 and junction 
block connector C-112 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 4.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC106611AB

CONNECTOR: C-28

C-28

AC106612AB

CONNECTOR: C-112

JUNCTION BLOCK
(FRONT VIEW)

C-112

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-123

STEP 4. Check the harness for open circuit or short circuit 
to ground between the input shaft speed sensor connector 
B-42 terminal 3 and the junction block connector C-112 
terminal 12.
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair or replace the harness wire.

AC001835

CONNECTOR: B-42

AH

B-42

AC106612AB

CONNECTOR: C-112

JUNCTION BLOCK
(FRONT VIEW)

C-112

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-124

STEP 5. Measure the PCM to speed sensor output voltage 
at the input shaft speed sensor connector B-42.
(1) Disconnect connector B-42 from the speed sensor and 

measure voltage at the harness side.

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

(3) Measure the voltage between terminal 2 and ground.

• The voltage should measure between 4.5 and 4.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 11.
NO :  Go to Step 6.

STEP 6. Measure the PCM output voltage to the speed 
sensor at the 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-42 at the input shaft speed sensor.
(3) Turn the ignition switch to the "ON" position.

(4) Measure the voltage between PCM terminal 103 and 

ground by backprobing.

• The voltage should measure between 4.5 and 4.9 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 7.
NO :  Go to Step 9.

AC001835

CONNECTOR: B-42

AH

B-42

ACX02127AO

B-42 HARNESS
CONNECTOR:
COMPONENT SIDE

AC001657

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

PCM

BC

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

AC001810AO

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

HARNESS CONNECTOR:
HARNESS SIDE