Mitsubishi Eclipse. Manual — part 833

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 12. Check harness for short circuit to ground or
open circuit between dual pressure switch connector A-36
terminal 1 and PCM connector C-57 <2.4L Engine> or C-59
<3.0L Engine> terminal 83.
Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO : Repair or replace the harness wire.

AC106628

CONNECTOR: C-94

AB

CONNECTOR BLOCK (RH)

C-94

AC004374

CONNECTOR: A-36

AC

A-36

AC001657

CONNECTOR: C-57 <2.4L ENGINE> OR
C-59 <3.0L ENGINE>

AZ

PCM

C-57 <2.4L ENGINE> OR C-59 <3.0L ENGINE>

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 13. Check the dual pressure switch.
Refer to GROUP 55, Dual Pressure Switch Check

P.55-24

.

Q: Is the switch operating properly?

YES : Go to Step 14.
NO : Replace the dual pressure switch. Refer to GROUP

55, Refrigerant Line

P.55-51

.

STEP 14. Using scan tool MB991958, check data list item
65: Dual Pressure 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) Start the engine and run at idle.
(3) Set scan tool MB991958 to data reading mode for item 65:

Dual Pressure Switch.

• When the A/C is in operation, the scan tool display

should be "ON."

• When the A/C is not in operation, the scan tool display

should be "OFF."

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

STEP 15. Check PCM connector C-57 <2.4L Engine> or
C-59 <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 14.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824

AC001657

CONNECTOR: C-57 <2.4L ENGINE> OR
C-59 <3.0L ENGINE>

AZ

PCM

C-57 <2.4L ENGINE> OR C-59 <3.0L ENGINE>

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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INSPECTION PROCEDURE 16: Transaxle won't Downshift under Load with Auto-cruise Engaged.

AC102734

Auto-cruise Signal Line System Circuit

AB

AC001741

CONNECTOR: C-20

AU

C-20

AC106611AB

CONNECTOR: C-28

C-28

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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CIRCUIT OPERATION
When the battery positive voltage from PCM (termi-
nal number 75) is grounded at auto-cruise con-
trol-ECU (terminal number 3), the auto-cruise
control-ECU emits an overdrive cancel signal. When
a malfunction of the auto-cruise control circuit
occurs, the transaxle may downshift harshly with the
auto-cruise control engaged.

.

COMMENT
A malfunction may be present on the auto-cruise sig-
nal line circuit, auto-cruise control ECU or the PCM.

.

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

• Damaged harness, connector

• Malfunction of the PCM

• Malfunction of the auto-cruise control ECU

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

AC001657

CONNECTOR: C-57 <2.4L ENGINE> OR
C-59 <3.0L ENGINE>

AZ

PCM

C-57 <2.4L ENGINE> OR C-59 <3.0L ENGINE>