Mitsubishi Eclipse. Manual — part 826

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-313

STEP 3. Check the hydraulic pressure (for reverse clutch).
Measure the hydraulic pressure for reverse clutch when the
selector lever is at the "R" range. Check if the hydraulic pres-
sure is within the standard value. Refer to

P.23A-28

, Hydraulic

Pressure Test.
Q: Is the hydraulic pressure within the standard value?

YES : Go to Step 4.
NO : Go to Step 9.

STEP 4. Check the hydraulic pressure (for low-reverse
brake).
Measure the hydraulic pressure for low-reverse brake when the
selector lever is at the "R" range. Check if the hydraulic pres-
sure is within the standard value. Refer to

P.23A-28

, Hydraulic

Pressure Test.
Q: Is the hydraulic pressure within the standard value?

YES : Go to Step 5.
NO : Go to Step 9.

STEP 5. Check the reverse clutch system and low-reverse
brake system.
(1) Remove the valve body cover and valve body. Refer to

P.23A-423

, Transaxle Assembly and GROUP 23B,

Transaxle

P.23B-10

.

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

clutch oil orifice of the transaxle case, and check if the
reverse clutch piston moves and air pressures are
maintained in that condition. Repeat for the low-reverse
brake.

Q: Are both air pressures maintained?

YES : Go to Step 6.
NO : Go to Step 9.

STEP 6. Check the reverse clutch and low-reverse brake.
(1) Remove the transaxle assembly.
(2) Check the facing for seizure and the piston seal ring for

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

P.23B-10

, 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 10.

AC001862

REVERSE CLUTCH
OIL ORIFICE

LOW-REVERSE
BRAKE OIL ORIFICE

AB

AC001863 AB

LOW-REVERSE BRAKE

REVERSE CLUTCH

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-314

STEP 7. Check shift shock.
Q: Does shift shock occur sometimes?

YES : Go to Step 8.
NO : Go to Step 9.

STEP 8. Using scan tool MB991958, check data list item 11:
TP Sensor.

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 11:

TP Sensor.

• With the throttle valve in idle position, voltage should

measure between 535 and 735 mV.

• With the throttle valve in full-open position, voltage

should measure between 4,500 and 5,500 mV.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 535 and 735 mV at

idle, and between 4,500 and 5,500 mV in the full-open
position?
YES : Go to Step 9.
NO : Check the TP sensor. Refer to

P.23A-43

,

P.23A-54

,

P.23A-64

, DTCs 11, 12, 14: TP Sensor System. Then

check the symptom.

STEP 9. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and the valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body

P.23B-74

.

Replace the valve body assembly if the damages are thought
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedures is complete.
NO : Go to Step 10.

STEP 10. Replace the PCM.
Q: Is the symptom eliminated?

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

AC303127

AB

MB991911

16-PIN

MB991827

MB991824

AC001860 AB

VALVE
BODY
ASSEMBLY

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-315

INSPECTION PROCEDURE 8: Shift Shock when Shifting from "N" to "D," "N" to "R" and Long Delay

.

COMMENT
If abnormal shock or delay of two seconds or more
occurs when the selector lever is moved from "N" to
"D" range or from "N" to "R" range while the engine is
idling, the cause is probably abnormal line pressure
or a malfunction of the oil pump or valve body.

.

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

• Abnormal line pressure

• Malfunction of the oil pump

• Malfunction of the valve body

• Malfunction of the PCM

DIAGNOSIS

STEP 1. Check the hydraulic pressure.
(1) Measure the hydraulic pressure of each element when the

transaxle is in 1st, 2nd or reverse. Check if each hydraulic
pressure is within the standard value. Refer to

P.23A-28

,

Hydraulic Pressure Test.

(2) If some elements pressures are within the standard value

and some are not, recheck the symptom.

Q: Are all hydraulic pressures within the standard value?

YES : Go to Step 3.
NO : Go to Step 2.

STEP 2. Adjust line pressure.
Adjust line pressure. Refer to

P.23A-41

, Line Pressure Adjust-

ment. Then check the symptom.
Q: Is the symptom eliminated?

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

STEP 3. Check when shift shock occurs.
Q: When does the shift shock occur?

When engaging from "N" to "D" and "N" to "R" : Go to

Step 4.

When the vehicle starts moving : Go to Step 5.

STEP 4. Replace the oil pump.
(1) Remove the transaxle.
(2) Replace the oil pump. (Oil pump cannot be repaired). Refer

to GROUP 23B, Transaxle

P.23B-10

. Then check the

symptom.

Q: Is the symptom eliminated?

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

AC001865

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-316

STEP 5. Disassemble and clean the valve body.
Check the installation bolts for looseness and the O-ring,
valves and valve body for damage. Repair or replace the faulty
parts. Refer to GROUP 23B, Valve Body

P.23B-74

.

Replace the valve body assembly if the damages are thought
to be irreparable. Then check 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 9: Shift shock and slipping

.

COMMENT
If shift shock when driving are due to upshifting or
downshifting and the transaxle speed become higher
than the engine speed, the cause is probably abnor-
mal line pressure or a malfunction of a solenoid
valve, oil pump, valve body or of a brake or clutch.

.

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

• Abnormal line pressure

• Malfunction of each solenoid valve

• Malfunction of the oil pump

• Malfunction of the valve body

• Malfunction of each brake or each clutch

• 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

AC001860 AB

VALVE
BODY
ASSEMBLY