Mitsubishi Eclipse. Manual - part 831

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-333

STEP 1. Using scan tool MB991958, check data list item 65: 
Dual Pressure Switch.

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 and run at idle.
(3) Set scan tool MB991958 to data reading mode for item 65: 

Dual Pressure Switch.

• When the A/C is in operation, the scan tool MB991958 

display should be "ON."

• When the A/C is not in operation, the scan tool 

MB991958 display should be "OFF."

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch 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 :  Go to Step 2.

STEP 2. Check dual pressure switch connector A-36 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 3.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AC004374

CONNECTOR: A-36

AC

A-36

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-334

STEP 3. Measure the power supply voltage at dual 
pressure switch connector A-36.
(1) Disconnect the connector A-36 and measure at the harness 

side.

(2) Start the engine and run at idle.
(3) Operate the A/C.

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

• Voltage should measure battery positive voltage.

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

YES : Go to Step 10.
NO :  Go to Step 4.

STEP 4. Measure the power supply voltage at automatic 
compressor controller connector C-12 by backprobing.
(1) Do not disconnect connector C-12.
(2) Start the engine and run at idle.
(3) Operate the A/C.

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

backprobing.

• Voltage should measure battery positive voltage.

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

YES : Go to Step 8.
NO :  Go to Step 5.

AC004374

CONNECTOR: A-36

AC

A-36

AC203669

2 1

AC

A-36 HARNESS
CONNECTOR:
COMPONENT SIDE

AC001741

CONNECTOR: C-12

AT

C-12

AC102545

C-12 HARNESS 
CONNECTOR:
HARNESS SIDE

AC

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-335

STEP 5. Check automatic compressor controller connector 
C-12 and intermediate connector C-94 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 6.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC001741

CONNECTOR: C-12

AT

C-12

AC106628

CONNECTOR: C-94

AB

CONNECTOR BLOCK (RH)

C-94

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-336

STEP 6. Check the harness for short circuit to ground 
between dual pressure switch connector A-36 terminal 2 
and automatic compressor controller connector C-12 
terminal 4.
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair or replace the harness wire.

AC004374

CONNECTOR: A-36

AC

A-36

AC001741

CONNECTOR: C-12

AT

C-12