Mitsubishi L200. Manual - part 288

 

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Mitsubishi L200. Manual - part 288

 

 

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-59

STEP 2. M.U.T.-III actuator test
Item 03: Second 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.4 and No.9 at the solenoid 
valve side.

OK: 2.7 

 3.4  (A/T fluid temperature 20°C)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Check the second 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.16 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-11 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.4 and A/T-ECU connector C-19 terminal No.16.
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 03: Second 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.4 and No.9 at the solenoid 
valve side.

OK: 2.7 

 3.4  (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.9 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-60

Code No.P1776 (P0765) Overdrive solenoid valve system

SOLENOID VALVE SYSTEM CIRCUIT
 Refer to 

P.23A-53

.

OPERATION
 Refer to 

P.23A-53

.

DIAGNOSIS CODE SET CONDITIONS
If the drive terminal voltage of the overdrive solenoid 
valve is 3.0 V or less, it is judged that there is a short 
circuit or open circuit in the overdrive solenoid valve, 
and diagnosis code No.P1776 (P0765) is output.
If diagnosis code No.P1776 (P0765) is output 4 
times, the transmission is fixed in 3rd as a fail-safe 
measure.

PROBABLE CAUSES

• Malfunction of overdrive solenoid valve

• Damaged harness wires and connectors

• Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Are diagnosis codes P1774 (P0755) and P1775 

(P0760) set?
YES : 

Go to Step 9.

NO : 

Go to Step 2.

STEP 2. M.U.T.-III actuator test
Item 04: Overdrive 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.5 and No.9 at the solenoid 
valve side.

OK: 2.7 

 3.4  (A/T fluid temperature 20°C)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Check the overdrive 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.14 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-11 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.5 and A/T-ECU connector C-19 terminal No.14.
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 04: Overdrive 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.

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-61

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.5 and No.9 at the solenoid 
valve side.

OK: 2.7 

 3.4  (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.9 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.

Code No.P1777 (P0770) Reduction solenoid valve system <5A/T>

SOLENOID VALVE SYSTEM CIRCUIT
 Refer to 

P.23A-53

.

OPERATION
 Refer to 

P.23A-53

.

DIAGNOSIS CODE SET CONDITIONS
If the drive terminal voltage of the reduction solenoid 
valve is 3.0 V or less, it is judged that there is a short 
circuit or open circuit in the reduction solenoid valve, 
and diagnosis code No.P1777 (P0770) is set.
If diagnosis code No.P1777 (P0770) is set, the trans-
mission is fixed in 3rd as a fail-safe measure.

PROBABLE CAUSES

• Malfunction of reduction solenoid valve

• Damaged harness wires and connectors

• Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Are diagnosis codes P1773 (P0750) and P1778 

(P0740) set?
YES : 

Go to Step 9.

NO : 

Go to Step 2.

STEP 2. M.U.T.-III actuator test
Item 5: Reduction 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.8 and No.10 at the sole-
noid valve side.

OK: 2.7 

 3.4  (A/T fluid temperature 20°C)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Check the reduction solenoid valve and 
solenoid valve harness.

STEP 5. Measure the voltage at A/T-ECU 
connector C-20.
(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 

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-62

connector C-20 terminal No.51 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-11 intermediate 
connector, C-20 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.8 and A/T-ECU connector C-20 terminal No.51.
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 5: Reduction 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.8 and No.10 at the sole-
noid valve side.

OK: 2.7 

 3.4  (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.

Code No.P1778 (P0740) Damper clutch control solenoid valve system

SOLENOID VALVE SYSTEM CIRCUIT
 Refer to 

P.23A-53

.

OPERATION
 Refer to 

P.23A-53

.

DIAGNOSIS CODE SET CONDITIONS
If the drive terminal voltage of the torque converter 
control clutch solenoid valve is 3.0 V or less, it is 
judged that there is a short circuit or open circuit in 
the torque converter control clutch solenoid valve, 
and diagnosis code No.P1778 (P0740) is output.
If diagnosis code No.P1778 (P0740) is output 4 
times, the transmission is fixed in 3rd as a fail-safe 
measure.

PROBABLE CAUSES

• Malfunction of damper clutch solenoid valve

• Damaged harness wires and connectors

• Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is diagnosis code P1773 (P0750), P1777 (P0770) 

<5A/T> set?
YES : 

Go to Step 9.

NO : 

Go to Step 2.

 

 

 

 

 

 

 

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