Mitsubishi Eclipse. Manual - part 817

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-277

Judgement Criteria

• Calculated slip (engine speed - input speed): 5 

r/min or less. (10 seconds)

• Calculated slip (engine speed - input speed): -5 

r/min or more. (10 seconds)

.

OBD-II DRIVE CYCLE PATTERN
Start the engine, and drive at 30 km/h (19 mph) for 
30 seconds. Then stop the vehicle, and turn "LOCK" 
(OFF) the ignition switch. After that, restart the 
engine, and drive again at 30 km/h (19 mph) for 30 
seconds.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Malfunction of the torque converter clutch sole-

noid valve

• Malfunction of the valve body

• Damaged harness or connector

• Malfunction of the PCM

DIAGNOSIS

Required Special Tool:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

STEP 1. Using scan tool MB991958, read the A/T 
diagnostic trouble code.

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) Turn the ignition switch to the "ON" position.
(3) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 36 set?

YES : Refer to 

P.23A-246

, DTC 36: Torque Converter 

Clutch Solenoid Valve System.

NO :  Go to Step 2.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-278

STEP 2. Using scan tool MB991958, check data list item 52: 
Amount of Torque Converter Clutch Slippage.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and drive the vehicle at a constant speed of 

60 km/h (37 mph). (Gear range: 3rd gear)

(3) Set scan tool MB991958 to the data reading mode for item 

52: Amount of Torque Converter Clutch Slippage.

• Driving at a constant speed of 60 km/h (37 mph), the 

display should be "

−10 to 10 r/min."

• If the accelerator pedal is released, the display on the 

scan tool changes. (50 km/h (31 mph) and less).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the torque converter clutch slippage within the 

specified range?
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 3.

STEP 3. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 53 set?

YES : Go to Step 4.
NO :  The procedure is complete.

STEP 4. Replace the valve body.
(1) Replace the valve body. Refer to GROUP 23B, Transaxle 

P.23B-10

.

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 53 set?

YES : Replace the Torque Converter. Refer to GROUP 23B, 

Transaxle 

P.23B-10

.

NO :  The procedure is complete.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AC001860 AB

VALVE
BODY
ASSEMBLY

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-279

DTC 54 (P1751): A/T Control Relay System

AC106637AB

A/T Control Relay System Circuit

AC102447AF

BATTERY

CONNECTOR: A-17X

A-17X

FRONT OF VEHICLE

AC001729AY

CONNECTOR: C-07

C-07

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-280

.

CIRCUIT OPERATION

• A/T control relay (terminal 1) receives battery 

positive voltage through a dedicated 20 amp 
fuse.

• The PCM (terminal 50) applies voltage to ener-

gize the A/T control relay (terminal 2). With the 
A/T control relay energized, system voltage is 
applied to the PCM (terminals 77 and 89).

.

DESCRIPTIONS OF MONITOR METHODS
If relay output voltage is below specified value, PCM 
judges that A/T control relay has a failure.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• DTC 41 (P0731): 1st gear incorrect ratio

• DTC 42 (P0732): 2nd gear incorrect ratio

• DTC 43 (P0733): 3rd gear incorrect ratio

• DTC 44 (P0734): 4th gear incorrect ratio

• DTC 46 (P0736): Reverse gear incorrect ratio

• DTC 36 (P0743): Torque converter clutch sole-

noid malfunction

• DTC 31 (P0753): Low-reverse solenoid malfunc-

tion

• DTC 32 (P0758): Underdrive solenoid malfunc-

tion

• DTC 33 (P0763): Second solenoid malfunction

• DTC 34 (P0768): Overdrive solenoid malfunction

Sensor (The sensor below is determined to be 

normal)

• Torque converter clutch solenoid

• Low-reverse solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

.

AC001657

CONNECTORS: C-54 <2.4L ENGINE> OR
C-55 <3.0L ENGINE>, C-57 <2.4L ENGINE>
OR C-59 <3.0L ENGINE>

BB

PCM

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

C-57 <2.4L ENGINE> 
OR
C-59 <3.0L ENGINE>