Mitsubishi L200. Manual - part 289

 

  Index      Mitsubishi     Mitsubishi L200 - service repair manual 2012 year

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  287  288  289  290   ..

 

 

Mitsubishi L200. Manual - part 289

 

 

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-63

STEP 2. M.U.T.-III actuator test
Item 06: Damper clutch solenoid valve

OK: Operating sound can be heard.

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction .)

NO : 

Go to Step 3.

STEP 3. Connector check: B-15 A/T control 
solenoid valve assembly connector
Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

STEP 4. Measure the resistance at A/T control 
solenoid valve assembly connector B-15.
Disconnect the connector, and measure the resist-
ance between terminal No.7 and No.10 at the sole-
noid valve side.

OK: 2.7 

− 3.4 Ω (A/T fluid temperature 20°C)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Check the damper clutch solenoid valve and 
solenoid valve harness.

STEP 5. Measure the voltage at A/T-ECU 
connector C-19.
(1) Connect A/T control solenoid valve assembly 

connector B-15.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between A/T-ECU 

connector C-19 terminal No.15 and earth.

OK: 6 

− 9 V

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 6.

STEP 6. Connector check: B-10 intermediate 
connector, C-19 A/T-ECU connector
Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

STEP 7. Check the harness between A/T control 
solenoid valve assembly connector B-15 terminal 
No.7 and A/T-ECU connector C-19 terminal No.15.
Check the output line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

STEP 8. M.U.T.-III actuator test
Item 06: Damper clutch solenoid valve

OK: Operating sound can be heard.

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction .)

NO : 

Replace the A/T-ECU.

STEP 9. Connector check: B-15 A/T control 
solenoid valve assembly connector
Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the defective connector.

STEP 10. Measure the resistance at A/T control 
solenoid valve assembly connector B-15.
Disconnect the connector, and measure the resist-
ance between terminal No.7 and No.10 at the sole-
noid valve side.

OK: 2.7 

− 3.4 Ω (A/T fluid temperature 20°C)

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Check the solenoid valve harness.

STEP 11. Connector check: A-19X A/T control 
relay connector, B-10 intermediate connector
Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the defective connector.

STEP 12. Check the harness between A/T control 
solenoid valve assembly connector B-15 terminal 
No.10 and A/T control relay connector A-19X 
terminal No.3.
Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-64

Code No.P1779 (1st), P1780 (2nd), P1781 (3rd), P1782 (4th), P1784 (reverse): Gear incorrect ratio <4A/
T>

OPERATION
The A/T-ECU detects the current gear/speed accord-
ing to the output signals from the input and output 
shaft speed sensor.

DIAGNOSIS CODE SET CONDITIONS
If the output from the output shaft speed sensor mul-
tiplied by the gear ratio is not the same as the output 
from the input shaft speed sensor after completing of 
shifting, the corresponding diagnosis code is output.
If each diagnosis code is output 4 times, the trans-
mission is fixed in 3rd as a fail-safe measure.

PROBABLE CAUSES

• Malfunction of input shaft speed sensor

• Malfunction of output shaft speed sensor

• Damaged harness wires and connectors

• Malfunction of the A/T-ECU

• Malfunction of solenoid valve

• Malfunction of underdrive clutch retainer

• Malfunction of valve body

• Malfunction of transfer drive gear or driven gear

• Malfunction of low-reverse brake system (for 

diagnosis codes P1779, P1784)

• Malfunction of underdrive clutch system (for diag-

nosis codes P1779, P1780, P1781)

• Malfunction of second brake system (for diagno-

sis codes P1780, P1782)

• Malfunction of overdrive clutch system (for diag-

nosis codes P1781, P1782)

• Malfunction of reverse clutch system (for diagno-

sis code P1784)

• Malfunction of one-way clutch system (for diag-

nosis code P1779)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Either of diagnosis codes P1779, P1780, P1781, 
P1782 or P1784 is output, the input shaft speed sen-
sor or output shaft speed sensor is defective.

Q: Are diagnosis codes P1766 (P0715) or P1767 

(P0720) output?

YES <diagnosis code P1766 (P0715) is output> : 

Refer to diagnosis code P1766 (P0715) 
input shaft speed sensor system 

P.23A-36

.

YES <diagnosis code P1767 (P0720) is output> : 

Refer to diagnosis code P1767 (P0720) 
output shaft speed sensor system 

P.23A-

41

.

NO : 

Go to Step 2.

STEP 2. M.U.T.-III diagnosis code
Either of diagnosis codes P1779, P1780, P1781, 
P1782 or P1784 is output, the corresponding sole-
noid valve is defective.

Q: Is either of diagnosis code P1773 (P0750), P1774 

(P0755), P1775 (P0760), P1776 (P0765) output?
YES <diagnosis code P1773 (P0750) is output> : 

Refer to diagnosis code P1773 (P0750): 
Low-reverse solenoid valve system 

P.23A-

53

.

YES <diagnosis code P1774 (P0755) is output> : 

Refer to diagnosis code P1774 (P0755): 
Underdrive solenoid valve system 

P.23A-

57

.

YES <diagnosis code P1775 (P0760) is output> : 

Refer to diagnosis code P1775 (P0760): 
Second solenoid valve system 

P.23A-58

.

YES <diagnosis code P1776 (P0765) is output> : 

Refer to diagnosis code P1776 (P0765): 
Overdrive solenoid valve system 

P.23A-60

.

NO : 

Go to Step 3.

STEP 3. Hydraulic pressure test
Each hydraulic pressure of the elements below, 
which diagnosis codes indicate, should be within the 
standard value.

• diagnosis code P1779: Underdrive clutch, low-

reverse brake

• diagnosis code P1780: Underdrive clutch, sec-

ond brake

• diagnosis code P1781: Underdrive clutch, over-

drive clutch

• diagnosis code P1782: Overdrive clutch, second 

brake

• diagnosis code P1784: Reverse clutch, low-

reverse brake

OK: Refer to Hydraulic Pressure Test 

P.23A-

120

.

Q: Is the check result normal?

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-65

YES : 

Go to Step 6.

NO <some hydraulic pressures are abnormal> : 

Go to Step 5.

NO <all hydraulic pressure are abnormal> : 

Go to 

Step 4.

STEP 4. Adjust the line pressure and recheck the 
diagnosis code.
(1) Adjust the line pressure (Refer to 

P.23A-129

).

(2) Test drive the vehicle.
(3) Check the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Go to Step 5.

NO : 

The inspection is complete.

STEP 5. Disassemble, clean and assemble the 
valve body and recheck the diagnosis code.
(1) Check the mounting bolts for looseness, and the 

O-ring, solenoid valve and valve body for 
damage.
Replace the valve body assembly if the damages 
are thought to be irreparable.

(2) Test drive the vehicle.
(3) Check the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Go to Step 7.

NO : 

The inspection is complete.

STEP 6. Replace the A/T-ECU and then recheck 
the diagnosis code.
(1) Replace the A/T-ECU.
(2) Test drive the vehicle.

(3) Check the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Go to Step 7.

NO : 

The inspection is complete.

STEP 7. Check the A/T internal clutch and brake, 
and then recheck the diagnosis code.
(1) Check the following clutches or brakes according 

to the output diagnosis codes, replace if 
necessary.

• If diagnosis code P1779, P1780, P1781 are 

output individually or in a group, replace the 
underdrive clutch.

• If diagnosis code P1781, P1782 are output 

individually or in a group, replace the over-
drive clutch.

• If diagnosis code P1784 is output, replace the 

reverse clutch.

• If diagnosis code P1779, P1784 are output 

individually or in a group, replace the low-
reverse brake.

• If diagnosis code P1780, P1782 are output 

individually or in a group, replace the second 
brake.

• If diagnosis code P1779 is output, replace the 

one-way clutch.

(2) Test drive the vehicle.
(3) Check the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Eliminate the cause of the noise.

NO : 

The inspection is complete.

Code No.P1779 (1st), P1780 (2nd), P1781 (3rd), P1782 (4th), P1783 (5th), P1784 (reverse): Gear 
incorrect ratio <5A/T>

OPERATION
The ECU detects the current gear/speed according 
to the output signals from the input and output shaft 
speed sensor.

DIAGNOSIS CODE SET CONDITIONS
If the output from the output shaft speed sensor mul-
tiplied by the gear ratio is not the same as the output 
from the input shaft speed sensor after completing of 
shifting, the corresponding diagnosis code is set.
If each diagnosis code is set 4 times, the transmis-
sion is fixed in 3rd as a fail-safe measure.

PROBABLE CAUSES

• Malfunction of input shaft speed sensor

• Malfunction of output shaft speed sensor

• Damaged harness wires and connectors

• Malfunction of the A/T-ECU

• Malfunction of solenoid valve

• Malfunction of reverse clutch retainer

• Malfunction of valve body

• Malfunction of direct planetary carrier

• Malfunction of low-reverse brake system (for 

diagnosis codes P1779, P1784)

• Malfunction of underdrive clutch system (for diag-

nosis codes P1779, P1780, P1781, P1782)

• Malfunction of second brake system (for diagno-

sis codes P1780, P1783)

• Malfunction of overdrive clutch system (for diag-

nosis codes P1781, P1782, P1783)

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-66

• Malfunction of reverse clutch system (for diagno-

sis code P1784)

• Malfunction of direct clutch system (for diagnosis 

codes P1782, P1783)

• Malfunction of reduction brake system (for diag-

nosis codes P1779, P1780, P1781, P1784)

• Malfunction of one-way clutch (OWC-L) system 

(for diagnosis code P1779)

• Malfunction of one-way clutch (OWC-D) system 

(for diagnosis code P1779, P1780, P1781)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Either of diagnosis codes P1779, P1780, P1781, 
P1782, P1783 or P1784 is set, the input shaft speed 
sensor or output shaft speed sensor is defective.

Q: Are diagnosis codes P1766 (P0715) or P1767 

(P0720) output?
YES diagnosis code P1766 (P0715) is set : 

Refer to 

diagnosis code P1766 (P0715) input shaft 
speed sensor system 

P.23A-36

.

YES diagnosis code P1767 (P0720) is set : 

Refer to 

diagnosis code P1767 (P0720) output shaft 
speed sensor system 

P.23A-41

.

NO : 

Go to Step 2.

STEP 2. M.U.T.-III diagnosis code
Either of diagnosis codes P1779, P1780, P1781, 
P1782, P1783 or P1784 is set, the corresponding 
solenoid valve is defective.

Q: Is either of diagnosis code P1773 (P0750), P1774 

(P0755), P1775 (P0760), P1776 (P0765), P1777 
(P0770) output?
YES diagnosis code P1773 (P0750) is set : 

Refer to 

diagnosis code P1773 (P0750): Low-
reverse solenoid valve system 

P.23A-53

.

YES diagnosis code P1774 (P0755) is set : 

Refer to 

diagnosis code P1774 (P0755): Underdrive 
solenoid valve system 

P.23A-57

.

YES diagnosis code P1775 (P0760) is set : 

Refer to 

diagnosis code P1775 (P0760): Second 
solenoid valve system 

P.23A-58

.

YES diagnosis code P1776 (P0765) is set : 

Refer to 

diagnosis code P1776 (P0765): Overdrive 
solenoid valve system 

P.23A-60

.

YES diagnosis code P1777 (P0770) is set : 

Refer to 

diagnosis code P1777 (P0770): Reduction 
solenoid valve system 

P.23A-61

 .

NO : 

Go to Step 3.

STEP 3. Hydraulic pressure test
Each hydraulic pressure of the elements below, 
which diagnosis codes indicate, should be within the 
standard value.

• diagnosis code P1779: Underdrive clutch, low-

reverse brake, reduction brake

• diagnosis code P1780: Underdrive clutch, sec-

ond brake, reduction brake

• diagnosis code P1781: Underdrive clutch, over-

drive clutch, reduction brake

• diagnosis code P1782: Underdrive clutch, over-

drive clutch, direct clutch

• diagnosis code P1783: Overdrive clutch, direct 

clutch, second brake

• diagnosis code P1784: Reverse clutch, low-

reverse brake, reduction brake

OK: Refer to Hydraulic Pressure Test 

P.23A-

120

.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO some hydraulic pressures are abnormal : 

Go 

to Step 5.

NO all hydraulic pressure are abnormal : 

Go to 

Step 4.

STEP 4. Adjust the line pressure and recheck the 
diagnosis code.
(1) Adjust the line pressure (Refer to 

P.23A-129

).

(2) Test drive the vehicle.
(3) Check the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Go to Step 5.

NO : 

The inspection is complete.

STEP 5. Disassemble, clean and assemble the 
valve body and recheck the diagnosis code.
(1) Check the mounting bolts for looseness, and the 

O-ring, solenoid valve and valve body for 
damage.
Replace the valve body assembly if the damages 
are thought to be irreparable.

(2) Test drive the vehicle.
(3) Check the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Go to Step 7.

NO : 

The inspection is complete.

STEP 6. Replace the A/T-ECU and then recheck 
the diagnosis code.
(1) Replace the A/T-ECU.
(2) Test drive the vehicle.

 

 

 

 

 

 

 

Content   ..  287  288  289  290   ..