Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 490

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-252

STEP 10. Check harness for short circuit to ground
between combination meter connector C-43 terminal 9 and
Park/Neutral position switch connector B-41 terminal 4.
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it.

STEP 11. Using scan tool MB991502, check the light bulb.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.

•

The "N" range light in the combination meter flushes.

(3) Turn the ignition switch to "LOCK" (OFF) position.

Q: Does the "N" range light flush?

YES : 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.

AC001729 AO

CONNECTOR: C-43

AC001844

CONNECTOR: B-41

DIPSTICK

AC001252

MB991502

16 PIN

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Vehicle does not Move

COMMENT
If the engine does not start when the selector lever is
in "P" or "N" position, the cause is probably a
malfunction of Park/Neutral position switch system,
transaxle control cable assembly, engine system,
torque converter or oil pump.

TROUBLESHOOTING HINTS (The most likely

causes for this case:)

•

Malfunction of the Park/Neutral position switch

•

Malfunction of the transaxle control cable
assembly

•

Malfunction of the engine system

•

Malfunction of the torque converter

•

Malfunction of the oil pump

•

Malfunction of the PCM

DIAGNOSIS

REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, read the A/T
diagnostic trouble code.

CAUTION

Q: Is A/T diagnostic trouble code numbers "27" or "28"

displayed?
YES : Refer to

P.23A-135

P.23A-163

, code number 27, 28:

Park/Neutral Position Switch System.

NO : Go to Step 2.

STEP 2. Check the transaxle control cable assembly.
Move the selector lever to each position, and check if the
manual control lever position of the Park/Neutral position
switch corresponds to the selector lever position.

Q: Is the manual control lever position correct?

YES : Go to Step 3.
NO : Repair the transaxle control cable. Refer to

P.23A-

340

, Park/Neutral Position Switch and Control Cable

Adjustment. Confirm that the malfunction symptom is
correct.

AC001252

MB991502

16 PIN

AC001856

PARK/NEUTRAL
POSITION SWITCH

MANUAL
CONTROL
LEVER

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 3. Check the engine.
Refer to GROUP 13A <2.4L Engine>, Diagnosis

−

Trouble

Symptom Chart

−

Starting

P.13A-22

or GROUP 13B <3.0L

Engine>, Diagnosis

−

Trouble Symptom Chart

−

Starting

P.13B-21

Q: Is the inspection result good?

YES : Go to Step 4.
NO : Repair or replace the appropriate engine

components.

STEP 4. Check the torque converter.
(1) Remove the transaxle.
(2) Check the torque converter for installation condition

(whether installed in a slanted direction or not), its spline or
its teeth for damage. Refer to GROUP 23B, Transaxle

P.22B-8

Q: Is the torque converter in good condition?

YES : Go to Step 5.
NO : Repair or replace it.

STEP 5. Replace the oil pump.
Replace the oil pump (Oil pump cannot be repaired). Refer to
GROUP 23B, Transaxle

P.22B-8

. Confirm that the malfunction

symptom is eliminated.

Q: Is the symptom eliminated?

YES : Diagnosis is complete.
NO : Go to Step 6.

STEP 6. Replace the PCM.

Q: Is the symptom eliminated?

YES : Diagnosis is complete.
NO : Start over at Step 1.

INSPECTION PROCEDURE 2: Does not Move Forward

COMMENT
If the vehicle does not move forward when the
selector lever is shifted from "N" to "D," "2" or "L"
range while the engine is idling, the cause is
probably abnormal line pressure or a malfunction of
the underdrive clutch or valve body.

TROUBLESHOOTING HINTS (The most likely

causes for this case:)

•

Abnormal line pressure

•

Malfunction of the underdrive solenoid valve

•

Malfunction of the underdrive clutch

•

Malfunction of the valve body

•

Malfunction of the PCM

AC001857

AC001858

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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DIAGNOSIS

REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check actuator test
item 02: Underdrive Solenoid Valve.

CAUTION

Underdrive Solenoid Valve.

•

An operation sound should be heard from solenoid
valve when solenoid valve is operated.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the solenoid valve operating properly?

YES : Go to Step 2.
NO : Repair or replace the underdrive solenoid valve.

Refer to GROUP 23B, Valve Body

P.23B-69

. Then

confirm that the symptom is eliminated.

STEP 2. Check the hydraulic pressure.
Measure the hydraulic pressure of each element when the
selector lever is at the "L" range, and check if each hydraulic
pressure is within the standard value. Refer to

P.23A-30

Hydraulic Pressure Test.

Q: Is the hydraulic pressure within the standard value?

YES : Go to Step 3.
NO : Go to Step 4.

STEP 3. Check the underdrive clutch system.
(1) Remove the valve body cover and valve body. Refer to

P.23A-353

, Transaxle Assembly and GROUP 23B,

Transaxle

P.23B-11

(2) Blow compressed air into the underdrive clutch oil orifice of

the transaxle case, and check if the underdrive clutch piston
moves and air pressure is maintained in that condition.

Q: Is the air pressure maintained?

YES : Go to Step 4.
NO : Go to Step 5.

AC001252

MB991502

16 PIN

AC001859

UNDERDRIVE
CLUTCH OIL
ORIFICE

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