Mitsubishi Eclipse. Manual — part 810

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-249

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: Is DTC 31 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-250

STEP 4. Measure the torque converter clutch 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 7 and 10.

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
torque converter clutch solenoid valve assembly inside
the transaxle.
(1) Disconnect connector B-40-4 and measure at the solenoid

valve side.

(2) Measure the resistance between torque converter clutch

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 torque converter clutch solenoid valve.

Refer to GROUP 23B, Valve Body

P.23B-74

.

ACX02479

CONNECTOR: B-40

AK

B-40

AC001975AN

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

AC002219

CONNECTOR: B-40-4

CN

B-40-4

VALVE BODY
ASSEMBLY

2

1

2

1

AC201141BI

B-40-4 HARNESS CONNECTOR:
TORQUE CONVERTER CLUTCH
SOLENOID VALVE SIDE

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-251

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 7 and PCM connector C-61 <2.4L
Engine> or C-63 <3.0L Engine> terminal 107.
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>

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-252

STEP 8. Measure the supply voltage at A/T control
solenoid valve assembly connector B-40.
(1) Disconnect solenoid valve assembly harness connector

B-40.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between harness connector B-40

terminal 10 and ground.

• The voltage should equal battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?

YES : Go to Step 11.
NO : Go to Step 9.

STEP 9. Check A/T control relay connector A-17X in the
engine component relay box and A/T control solenoid
valve assembly connector B-40 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 10.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

ACX02479

CONNECTOR: B-40

AK

B-40

AC001966 AO

B-40 HARNESS
CONNECTOR:
COMPONENT SIDE

AC102447AF

BATTERY

CONNECTOR: A-17X

A-17X

FRONT OF VEHICLE

ACX02479

CONNECTOR: B-40

AK

B-40