Mitsubishi L200. Manual — part 297
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-95
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Item 26: Overdrive switch (Refer to data list refer-
ence table
).
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
Malfunction ).
NO :
Go to Step 2.
STEP 2. Check the overdrive switch.
Refer to
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the high/low detection switch.
STEP 3. Measure the voltage at overdrive switch
connector C-129.
(1) Disconnect the connector, and measure the
voltage between terminal 3 and earth at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 4.
STEP 4. Connector check: C-129 overdrive
switch connector, C-208 J/B connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the defective connector.
STEP 5. Check the harness between overdrive
switch connector C-129 terminal No.3 and J/B
connector C-208 terminal No.2.
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 6. Measure the voltage at A/T-ECU
connector C-20.
(1) Disconnect high/low detection switch connector
C-129.
(2) Turn the ignition switch to the ON position.
(3) Overdrive switch: ON.
(4) Measure the voltage between A/T-ECU
connector C-20 terminal No.57 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 8.
STEP 7. M.U.T.-III data list
Item 26: Overdrive switch (Refer to data list refer-
ence table
).
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 8. Connector check: C-129 overdrive
switch connector, C-52 <LHD>or C-34 <RHD>
intermediate connector, C-20 A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the defective connector.
STEP 9. Check the harness between overdrive
switch connector C-129 terminal No.4 and A/T-
ECU connector C-20 terminal No.57.
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the wiring harness.
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-96
Inspection Procedure 17: 4LLc operation detection switch system <4WD>
AC903912
A/T-ECU
4LLc
OPERATION
DETECTION
SWITCH
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
4LLc Operation Detection Switch System Circuit
AC509975AO
Harness side
A-115
Connector: A-115
AC510056AH
B-05
Connector: B-05
Harness side
AC510057
A/T-ECU
C-19
AD
Connector: C-19
A/T-ECU
<RHD>
<LHD>
Harness side
AC509611CW
Harness side
Connector: C-29 <LHD>
C-29
AC509930BI
Connector: C-29 <RHD>
Harness side
C-29
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-97
OPERATION
• A battery voltage is applied to the 4LLc operation
detection switch output terminal (terminal 1) from
the A/T-ECU (terminal 9) via the resistance in the
unit.
• The 4LLc operation detection switch is grounded
through the transfer case to the vehicle body.
COMMENTS ON TROUBLE SYMPTOM
If the transmission shifts to 4th gear when the trans-
fer lever is in the 4L position, the cause is probably a
malfunction of the 4LLc operation detection switch.
PROBABLE CAUSES
• Malfunction of the 4LLc operation detection
switch
• Damaged harness wires and connectors
• Malfunction of the A/T-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Item 31: 4LLc operation detection switch (Refer to
data list reference table
).
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
Malfunction ).
NO :
Go to Step 2.
STEP 2. Check the 4LLc operation detection
switch.
Refer to
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the 4LLc operation detection
switch.
STEP 3. Measure the voltage at 4LLc operation
detection switch connector B-05.
(1) Disconnect the connector, and measure the
resistance between terminal 1 and earth at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 5.
STEP 4. M.U.T.-III data list
Item 31: 4LLc operation detection switch (Refer to
data list reference table
).
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 5. Measure the voltage at A/T-ECU
connector C-19.
(1) Disconnect 4LLc operation detection switch
connector B-05.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between A/T-ECU
connector C-19 terminal No.9 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 8.
STEP 6. Connector check: B-05 4LLc operation
detection switch connector, A-115 and C-29
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.
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-98
STEP 7. Check the harness between 4LLc
operation detection switch connector B-05
terminal No.1 and A/T-ECU connector C-19
terminal No.9.
Check the power supply line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the wiring harness.
STEP 8. Connector check: B-05 4LLc operation
detection switch connector, A-115 and C-29
intermediate connector, C-19 A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the defective connector.
STEP 9. Check the harness between 4LLc
operation detection switch connector B-05
terminal No.1 and A/T-ECU connector C-19
terminal No.9.
Check the power supply line for short circuit.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the wiring harness.
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