Mitsubishi Eclipse. Manual - part 829

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-325

STEP 2. Measure the backup power supply voltage at PCM
connector C-54 <2.4L Engine> or C-55 <3.0L Engine> by
backprobing.
(1) Do not disconnect connector C-54 <2.4L Engine> or C-55

<3.0L Engine>.

(2) Measure the voltage between terminal 66 and ground by

backprobing.

• The voltage should be measured battery positive volt-

age.

Q: Is the measured voltage battery positive voltage?

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

STEP 3. Check intermediate connector C-07 and PCM
connector C-54 <2.4L Engine> or C-55 <3.0L Engine> 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

. Then check for the symptom.

AC001657

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

PCM

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

AC002091

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

AC001729AY

CONNECTOR: C-07

C-07

AC001657

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

PCM

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

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-326

STEP 4. Check the harness for open circuit between PCM
connector C-54 <2.4L Engine> or C-55 <3.0L Engine>
terminal 66 and battery.
Q: Is the harness wire in good condition?

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

STEP 5. Using scan tool MB991958, check data list item 61:
Transmission Range 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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to data reading mode for item 61:

Transmission Range Switch.

• Move the selector lever to "P," "R," "N," "D," "3," "2," "L"

positions and confirm that the selected selector lever
positions match the positions shown on the scan tool
MB991958.

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

YES : Check for the symptom. If the symptom is not

eliminated, replace the PCM.

NO : Refer to

P.23A-155

P.23A-192

, DTCs 27, 28:

Transmission Range Switch System.

INSPECTION PROCEDURE 13: Poor Acceleration

COMMENT
If acceleration is poor when downshifting occurs
while driving, a malfunction of the engine system or a
brake or clutch may exist.

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

• Malfunction of the engine system

• Malfunction of the clutch system and brake sys-

tem

• Malfunction of the PCM

AC001657

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

PCM

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

AC303127

MB991911

16-PIN

MB991827

MB991824

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-327

DIAGNOSIS

STEP 1. Check the engine system.
Refer to GROUP 13A <2.4L Engine>, Diagnosis

− Symptom

Chart

− Poor acceleration

P.13A-28

, or GROUP 13B <3.0L

Engine>, Diagnosis

− Symptom Chart − Poor acceleration

P.13B-27

Q: Is the inspection result good?

YES : Go to Step 2.
NO : Repair or replace the engine component(s).

STEP 2. Check each brake and clutch.
Perform the torque converter stall test. Refer to

P.23A-26

Torque Converter Stall Test. Then check for the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 3.

STEP 3. Perform the hydraulic pressure test.
Perform the hydraulic pressure test. Refer to

P.23A-28

Hydraulic Pressure Test. Then check for the symptom.
Q: Is the symptom eliminated?

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

STEP 4. Check each brake system and clutch system.
(1) Remove the valve body cover and valve body. Refer to

GROUP 23B, Transaxle

P.23B-10

(2) Blow 108 kPa (15 psi) compressed air into the each brake

oil orifice and clutch oil orifice of the transaxle case, and
check if each brake and each clutch piston move and air
pressure is maintained.

Q: Is the air pressure maintained?

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

AC001870

LOW-REVERSE BRAKE
OIL ORIFICE

REVERSE CLUTCH
OIL ORIFICE

OVERDRIVE
CLUTCH
OIL ORIFICE

SECOND BRAKE
OIL ORIFICE

UNDERDRIVE
CLUTCH
OIL ORIFICE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-328

STEP 5. Check each brake system and clutch system.
(1) Remove the transaxle.
(2) Check the facings for seizure and piston seal ring for

damage and interference with retainer. Repair or replace
the faulty parts. Refer to GROUP 23B, Transaxle

P.23B-10

Underdrive Clutch and Input Shaft

P.23B-57

, Reverse and

Overdrive Clutch

P.23B-59

. Then check for the symptom.

Q: Is the symptom eliminated?

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

STEP 6. Replace the PCM.
Q: Is the symptom eliminated?

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

INSPECTION PROCEDURE 14: Vibration

COMMENT
If vibration occurs when driving at constant speed or
when accelerating in 4th gear, abnormal torque con-
verter clutch pressure a malfunction of the engine
system, torque converter clutch solenoid, torque con-
verter or valve body may exist.

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

• Abnormal torque converter clutch pressure

• Malfunction of the engine system

• Malfunction of the torque converter clutch sole-

noid

• Malfunction of the torque converter

• Malfunction of the valve body

• 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

AC001868

REVERSE
CLUTCH

SECOND
BRAKE

LOW-
REVERSE
BRAKE

UNDERDRIVE
CLUTCH

OVERDRIVE CLUTCH

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