Mitsubishi Eclipse. Manual - part 828

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-321

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are the solenoid valves operating properly?

YES : Go to Step 4.
NO :  Go to Step 6.

STEP 4. Adjust the line pressure.
Adjust the line pressure. Refer to 

P.23A-41

, Line Pressure 

Adjustment. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 5.

STEP 5. 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 7.

STEP 6. Replace each solenoid valve.
Replace the faulty solenoid valve with a new one.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 7.

STEP 7. Replace the PCM.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Start over at Step 1.

INSPECTION PROCEDURE 11: Early or Late Shifting Some Gears

.

COMMENT
If some of the shift points are early or late when driv-
ing, the cause is probably a malfunction of the valve 
body, or it is due to the characteristics of the 
INVECS-II system but is not an abnormality.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case:)

• Malfunction of the valve body

• Malfunction of the PCM

AC001860 AB

VALVE
BODY
ASSEMBLY

AC001869 AB

OVERDRIVE
SOLENOID
VALVE

LOW-
REVERSE
SOLENOID
VALVE

VALVE
BODY
ASSEMBLY

UNDERDRIVE
SOLENOID
VALVE

SECOND
SOLENOID
VALVE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-322

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, check actuator test 
item 14: INVECS-II Cancel Command.

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 actuator test mode for item14: 

INVECS-II Cancel Command.

• Drive the vehicle and confirm the gear shifting corre-

spond to the standard shift line of the shift pattern dia-
gram. Refer to 

P.23A-3

.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the gear shifting correspond to the standard shift 

line of the shift pattern diagram?
YES : The symptom is due to characteristics of the 

INVECS-II system, but is not abnormal.

NO :  Go to Step 2.

STEP 2. Check the shift points.
Q: Are the shift points early or late only when transmission 

fluid is -29

°C (84°F) or less (early), or 125°C (257°F) or 

more (late)?
YES : The symptom is due to characteristics of the 

INVECS-II system, but is not abnormal.

NO :  Go to Step 3.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-323

STEP 3. 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 4.

STEP 4. Replace the PCM.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Start over at Step 1.

INSPECTION PROCEDURE 12: No Diagnostic Trouble Codes (Does not Shift)

AC001860 AB

VALVE
BODY
ASSEMBLY

AC106638

Backup Power Supply System Circuit

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-324

.

CIRCUIT OPERATION
PCM (terminal number 66) receives battery positive 
voltage from the battery.

.

COMMENT
If shifting does not occur while driving and no diag-
nostic trouble codes are output, a malfunction of the 
transmission range switch, or PCM may exist.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case:)

• Malfunction of the transmission range switch

• Damaged harness, 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. Check the vehicle acceleration.
Q: Does the vehicle accelerate poorly (transaxle stays in 

3rd gear) when starting from a stop with the selector 
lever in "D" range?
YES : Go to Step 2.
NO :  Go to Step 5.

AC001729AY

CONNECTOR: C-07

C-07

AC001657

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

PCM

BA

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