Mitsubishi L200. Manual — part 287
AC509975AO
Harness side
A-115
Connector: A-115
AC510163
AG
Connector: A-19X
Relay box side
A-19X
AC510056AD
Harness side
B-10 (B)
Connector: B-10
AC510056AC
Harness side
B-11 (B)
Connector: B-11
AC510056AB
Harness side
B-15 (B)
Connector: B-15
AC510057
A/T-ECU
C-19
AD
Connector: C-19
A/T-ECU
<RHD>
<LHD>
Harness side
AC510057
Harness side
A/T-ECU
C-20
AC
Connector: C-20
A/T-ECU
<RHD>
<LHD>
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-55
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-56
OPERATION
• Solenoid valve closes or opens according to the
signals from the A/T-ECU.
• The A/T-ECU energizes or deenergizes solenoid
valve, based on input signals such as accelerator
pedal position sensor opening angle, inhibitor
switch, etc.
DIAGNOSIS CODE SET CONDITIONS
If the drive terminal voltage of the low-reverse sole-
noid valve is 3.0 V or less, it is judged that there is a
short circuit or open circuit in the low-reverse sole-
noid valve, and diagnosis code No.P1773 (P0750) is
set.
If diagnosis code No.P1773 (P0750) is output 4
times, the transmission is fixed in 3rd as a fail-safe
measure.
PROBABLE CAUSES
• Malfunction of low-reverse 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 P1778 (P0740), P1777 (P0770)
<5A/T> set?
YES :
Go to Step 9.
NO :
Go to Step 2.
STEP 2. M.U.T.-III actuator test
Item 01: Low-reverse 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.6 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 low-reverse 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
connector C-20 terminal No.62 and earth.
OK: System voltage
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.6 and A/T-ECU connector C-20 terminal No.62.
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 01: Low-reverse 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-57
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.6 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.P1774 (P0755) Underdrive solenoid valve system
SOLENOID VALVE SYSTEM CIRCUIT
Refer to
.
OPERATION
Refer to
.
DIAGNOSIS CODE SET CONDITIONS
If the drive terminal voltage of the underdrive sole-
noid valve is 3.0 V or less, it is judged that there is a
short-circuit or open circuit in the solenoid valve, and
diagnosis code No.P1774 (P0755) is output.
If diagnosis code No.P1774 (P0755) is output 4
times, the transmission is fixed in 3rd as a fail-safe
measure.
PROBABLE CAUSES
• Malfunction of underdrive 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 P1775 (P0760) and P1776
(P0765) set?
YES :
Go to Step 9.
NO :
Go to Step 2.
STEP 2. M.U.T.-III actuator test
Item 02: Underdrive 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.3 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 underdrive solenoid valve.
STEP 5. Measure the voltage at A/T-ECU
connector C-19.
(1) Connect A/T control solenoid valve assembly
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-58
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.1 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.3 and A/T-ECU connector C-19 terminal No.1.
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 02: Underdrive 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.3 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.P1775 (P0760) Second solenoid valve system
SOLENOID VALVE SYSTEM CIRCUIT
Refer to
.
OPERATION
Refer to
.
DIAGNOSIS CODE SET CONDITIONS
If the drive terminal voltage of the second solenoid
valve is 3.0 V or less, it is judged that there is a short
circuit or open circuit in the second solenoid valve,
and diagnosis code No.P1775 (P0760) is output.
If diagnosis code No.P1775 (P0760) is output 4
times, the transmission is fixed in 3rd as a fail-safe
measure.
PROBABLE CAUSES
• Malfunction of second 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 code P1774 (P0755) and P1776
(P0765) set?
YES :
Go to Step 9.
NO :
Go to Step 2.
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