Mitsubishi Eclipse. Manual - part 803

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-221

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 02: Underdrive Solenoid Valve.

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 actuator test mode for item 02: 

Underdrive Solenoid Valve.

• An audible clicking or buzzing should be heard when the 

underdrive solenoid valve is energized.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid valve 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.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-222

STEP 2. Using scan tool MB991958, read the A/T 
diagnostic trouble code.
(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 54 set? (DTC 54 may be set along with multiple 

DTCs).
YES : Refer to 

P.23A-279

 DTC 54: A/T Control Relay 

System.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the A/T 
diagnostic trouble code.
(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: Are DTC 33 and DTC 34 set? (Multiple DTCs may be set).

YES : Go to Step 8.
NO :  Go to Step 4.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-223

STEP 4. Measure the underdrive solenoid valve resistance 
at A/T control solenoid valve assembly connector B-40.
(1) Disconnect connector B-40 and measure at the solenoid 

valve side.

(2) Measure the resistance between solenoid valve assembly 

connector B-40 terminals 3 and 9.

Resistance value: 2.7

−3.4 Ω [at 20°C (68°F)]

Q: Is the measured resistance 2.7

−3.4 Ω [at 20°C (68°F)]?

YES : Go to Step 6.
NO :  Go to Step 5.

STEP 5. Measure the solenoid valve resistance at the 
underdrive solenoid valve assembly inside the transaxle.
(1) Disconnect connector B-40-1 and measure at the solenoid 

valve side.

(2) Measure the resistance between Underdrive solenoid valve 

terminals 1 and 2.

Resistance value: 2.7

−3.4 Ω [at 20°C (68°F)]

Q: Is the measured resistance 2.7

−3.4 Ω [at 20°C (68°F)?

YES : Replace the harness wire between A/T control 

solenoid valve assembly connector B-40 and the 
solenoid valves.

NO :  Replace the Underdrive solenoid valve. Refer to 

GROUP 23B, Valve Body 

P.23B-74

.

ACX02479

CONNECTOR: B-40

AK

B-40

AC001962 AN

B-40 HARNESS CONNECTOR:
A/T CONTROL SOLENOID VALVE
ASSEMBLY SIDE

AC002219

CONNECTOR: B-40-1

CJ

B-40-1

VALVE BODY
ASSEMBLY

2

1

2

1

AC201141BF

B-40-1 HARNESS CONNECTOR: 
UNDERDRIVE
SOLENOID VALVE SIDE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-224

STEP 6. Check A/T control solenoid valve assembly 
connector B-40 and PCM connector C-61 <2.4L Engine> or 
C-63 <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 7.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 7. Check the harness for an open or short circuit to 
ground between A/T control solenoid valve assembly 
connector B-40 terminal 3 and PCM connector C-61 <2.4L 
Engine> or C-63 <3.0L Engine> terminal 120.
Q: Is the harness wire in good condition?

YES : Replace the PCM.
NO :  Repair or replace the harness wire.

ACX02479

CONNECTOR: B-40

AK

B-40

AC001657

CONNECTOR: C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>

PCM

BC

C-61 <2.4L ENGINE> OR C-63 <3.0L ENGINE>

ACX02479

CONNECTOR: B-40

AK

B-40

AC001657

CONNECTOR: C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>

PCM

BC

C-61 <2.4L ENGINE> OR C-63 <3.0L ENGINE>