Mitsubishi Eclipse. Manual - part 815

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-269

STEP 4. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and the valve 
body for damage. Repair or replace the faulty parts. Refer to 
GROUP 23B, Valve Body 

P.23B-74

.

Replace the valve body assembly if the damages are thought 
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 6.

STEP 5. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Were any A/T DTCs set?

YES : Go to Step 6.
NO :  The procedure is complete.

STEP 6. Overhaul the A/T.
(1) Replace the following parts.

• If DTC 41, DTC 42, or DTC 43 are set individually or in a 

group, replace the underdrive clutch. Refer to GROUP 
23B, Underdrive Clutch and Input Shaft 

P.23B-57

.

• If DTC 43 or DTC 44 are set individually or in a group, 

replace the overdrive clutch. Refer to GROUP 23B, 
Reverse and Overdrive Clutch 

P.23B-59

.

• If DTC 46 is set, replace the reverse clutch. Refer to 

GROUP 23B, Reverse and Overdrive Clutch 

P.23B-59

.

• If DTC 41 or DTC 46 are set individually or in a group, 

replace the low-reverse brake. Refer to GROUP 23B, 
Transaxle 

P.23B-10

.

• If DTC 42 or DTC 44 are set individually or in a group, 

replace the second brake. Refer to GROUP 23B, Tran-
saxle 

P.23B-10

.

• If DTC 41 is set, replace the one-way clutch. Refer to 

GROUP 23B, Planetary Gear 

P.23B-66

.

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Are any A/T DTCs set again?

YES : An A/T DTC may have set due to external radio 

frequency interference (RFI) possibly caused by 
cellular phone activity, or aftermarket components 
installed on the vehicle.

NO :  The procedure is complete.

AC001860 AB

VALVE
BODY
ASSEMBLY

AC001868

REVERSE
CLUTCH

SECOND
BRAKE

LOW-
REVERSE
BRAKE

UNDERDRIVE
CLUTCH

OVERDRIVE CLUTCH

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-270

DTC 52 (P0741): Torque Converter Clutch System

.

DESCRIPTIONS OF MONITOR METHODS
At start of lock-up operation, if lock-up clutch cannot 
be engaged even when duty ratio of torque converter 
clutch solenoid remains 100% for more than speci-
fied time, PCM judges that torque converter clutch is 
stuck OFF.

.

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 21 (P0335): Crankshaft position sensor mal-

function

• DTC 22 (P0715): Input shaft speed sensor mal-

function

• DTC 23 (P0720): Output shaft speed sensor mal-

function

• DTC 53 (P0742): Torque converter clutch system 

malfunction (Stuck ON)

• 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

• DTC 54 (P1751): A/T control relay malfunction

Sensor (The sensor below is determined to be 

normal)

• Input shaft speed sensor

• Output shaft speed sensor

• Crankshaft position sensor

• Torque converter clutch solenoid

• Low-reverse solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

• A/T control relay

.

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-271

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Solenoid status: plunging into connecting condi-

tion.

• Transmission range switch position: D, 3 or 2.

Judgement Criteria

• Time during 100% duty: 4 seconds or more.

.

OBD-II DRIVE CYCLE PATTERN
Start the engine, and drive at 100 km/h (62 mph) for 
10 seconds. Then stop the vehicle, and turn OFF the 
ignition switch. After that, restart the engine, and 
drive again at 100 km/h (62 mph) for 10 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 input shaft speed sensor

• Malfunction of the underdrive clutch retainer

AC205238

START

END

Transmission range 
switch position is in 
D, 3 or 2 range

TCC is plunging
into connecting
condition?

TCC solenoid duty 
ratio is 100%

Continuous failure for 4 secs.

Good

Malfunction

No

Yes

No

Yes

No

Yes

No

Yes

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-272

• Malfunction of the valve body

• Damaged harness or connector

• Malfunction of the PCM

• Malfunction of the torque converter

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 22 or 36 set?

YES <DTC 22 set> : Refer to 

P.23A-117

, DTC 22: Input 

Shaft Speed Sensor System.

YES <DTC 36 set> : 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