Mitsubishi L200. Manual — part 283
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-39
STEP 10. Connectors check: C-208 J/B
connector, B-10 and C-52 <4A/T, 5A/T-LHD>or C-
34 <5A/T-RHD> intermediate connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Repair the defective connector.
STEP 11. Check the harness between input shaft
speed sensor connector B-17 terminal No.3 and
junction block 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 12. Measure the voltage at input shaft
speed sensor connector B-17.
(1) Disconnect the connector, and measure the
voltage between terminal 2 and earth at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
OK: 4.5
− 4.9 V
Q: Is the check result normal?
YES :
Go to Step 18.
NO :
Go to Step 13.
STEP 13. Measure the voltage at A/T-ECU
connector C-12.
(1) Disconnect input shaft speed sensor connector
B-17.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between A/T-ECU
connector C-12 terminal No.31 and earth.
OK: 4.5
− 4.9 V
Q: Is the check result normal?
YES :
Go to Step 16.
NO :
Go to Step 14.
STEP 14. Connector check: B-11 intermediate
connector, C-12 A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 15.
NO :
Repair the defective connector.
STEP 15. Check the harness between input shaft
speed sensor connector B-17 terminal No.2 and
A/T-ECU connector C-12 terminal No.31.
Check the output line for short circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 16. Connector check: B-11 intermediate
connector, C-12 A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Repair the defective connector.
STEP 17. Check the harness between input shaft
speed sensor connector B-17 terminal No.2 and
A/T-ECU connector C-12 terminal No.31.
Check the output line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 18. Measure the output wave pattern of the
input shaft speed sensor at A/T-ECU connector
C-12 (using an oscilloscope).
(1) Shift the selector lever to the D range.
(2) Accelerate the vehicle to approximately 50 km/h
(shift range; 3rd).
(3) Connect an oscilloscope, and measure the
voltage between A/T-ECU connector C-12
terminal No.31 and earth.
OK: A wave pattern such as the one
shown on
(Check Procedure
Using an Oscilloscope) should be output,
and the maximum value should be 4.8 V
or more and the minimum value should
be 0.8 V or less. There should be no noise
in the output wave pattern.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 19.
STEP 19. Connector check: C-12 A/T-ECU
connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 20.
NO :
Repair the defective connector.
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-40
STEP 20. Replace the input shaft speed sensor
and then recheck the diagnosis code.
(1) Replace the input shaft speed sensor.
(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.
Q: Is diagnosis code P1766 set?
YES :
Go to Step 21.
NO :
The inspection is complete.
STEP 21. Underdrive clutch retainer inspection
Visually check the underdrive clutch retainer for dam-
age.
Q: Is the check result normal?
YES :
Eliminate the cause of the noise.
NO :
Replace the underdrive clutch retainer.
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-41
Code No.P1767 (P0720) Output shaft speed sensor system
A/T-ECU
OUTPUT SHAFT
SPEED SENSOR
IGNITION
SWITCH (IG1)
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
Output Shaft Speed Sensor System Circuit
AC903905
<4A/T, 5A/T-LHD>
<5A/T-RHD>
AC503225AE
Harness side
B-10 (B)
Connector: B-10
AC503225AD
Harness side
B-11 (B)
Connector: B-11
AC510056AF
B-16 (GR)
Connector: B-16
Harness side
AC510057
Harness side
A/T-ECU
C-12
AB
Connector: C-12
A/T-ECU
<RHD>
<LHD>
AC509930AG
Connector: C-34 <RHD>
C-34
Harness side
AC509613AG
Connector: C-52 <LHD>
C-52
Harness side
AC509934
Connectors: C-207, C-208 <LHD>
Junction block (Front view)
C-208
CX
Harness side
C-207
AC509936
Connectors: C-207, C-208 <RHD>
Harness side
C-208
C-207
BZ
Junction block
(Front view)
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-42
OPERATION
The output shaft speed sensor detects the speed of
the transfer drive gear, and sends the information to
the A/T-ECU as a pulse signal.
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