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 Ω (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 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.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
.
OPERATION
Refer to
.
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 Ω (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 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.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
.
OPERATION
Refer to
.
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 Ω (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 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.
Code No.P1778 (P0740) Damper clutch control solenoid valve system
SOLENOID VALVE SYSTEM CIRCUIT
Refer to
.
OPERATION
Refer to
.
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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