Mitsubishi L200. Manual - part 287

 

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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 

P.23A-53

.

OPERATION
 Refer to 

P.23A-53

.

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 

P.23A-53

.

OPERATION
 Refer to 

P.23A-53

.

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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