Mitsubishi L200. Manual — part 282
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-35
PROBABLE CAUSES
• Malfunction of the A/T fluid temperature sensor
• Damaged harness wires and connectors
• Malfunction of the A/T-ECU
DIAGNOSIS
STEP 1. M.U.T.-III data list
Item 07: A/T fluid temperature sensor (Refer to Data
List 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. Connector check: B-15 A/T control
solenoid valve assembly
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the defective connector.
STEP 3. Measure the voltage at A/T control
solenoid valve assembly connector B-15.
(1) Disconnect the connector, and measure the
voltage between terminal 1 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 4.
NO :
Go to Step 6.
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 1 and 2 at the sensor side.
OK:
• 16.7 − 20.5 kΩ (at 0°C)
• 7.3 − 8.9 kΩ (at 20°C)
• 3.4 − 4.2 kΩ (at 40°C)
• 1.9 − 2.2 kΩ (at 60°C)
• 1.0 − 1.2 kΩ (at 80°C)
• 0.57 − 0.69 kΩ (at 100°C)
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the A/T fluid temperature sensor.
STEP 5. M.U.T.-III data list
Item 07: A/T fluid temperature sensor (Refer to Data
List 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 6. Measure the voltage at A/T-ECU
connector C-12.
(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-12 terminal No.44 and earth.
OK:
• 3.8 − 4.0 V (at 20°C)
• 3.2 − 3.4 V (at 40°C)
• 1.7 − 1.9 V (at 80°C)
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 7.
STEP 7. Connector check: B-10 intermediate
connector, C-12 A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the defective connector.
STEP 8. Check the harness between A/T control
solenoid valve assembly connector B-15 terminal
No.1 and A/T-ECU connector C-12 terminal No.44.
Check the output line for short-circuited or open cir-
cuit.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the wiring harness.
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-36
Code No.P1766 (P0715) Input shaft speed sensor system
A/T-ECU
INPUT 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
Input Shaft Speed Sensor System Circuit
AC903904
<4A/T, 5A/T-LHD>
<5A/T-RHD>
AC510056AD
Harness side
B-10 (B)
Connector: B-10
AC510056AC
Harness side
B-11 (B)
Connector: B-11
AC510056AE
B-17 (B)
Connector: B-17
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-37
OPERATION
The input shaft speed sensor detects the speed of
the underdrive clutch retainer, and sends the infor-
mation to the A/T-ECU as a pulse signal.
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-38
DIAGNOSIS CODE SET CONDITIONS
The diagnosis code No.P1766 (P0715) is set if the
input shaft speed sensor does not send a pulse sig-
nal for one second or more while the 3rd gears are
engaged and the vehicle speed is 40 km/h or more
(the output shaft speed sensor speed is 1,000 r/min
or more).
If the code No.P1766 (P0715) is set four times, the
transmission will be fixed in 3rd gear as a fail-safe
measure. However, the transmission can be down-
shifted to 2nd gear by operating the selector lever.
PROBABLE CAUSES
• Malfunction of input shaft speed sensor
• Malfunction of underdrive clutch retainer
• Damaged harness wires and connectors
• Malfunction of the A/T-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Item 05: Input shaft speed sensor (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. Connector check: B-17 input shaft speed
sensor connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the defective connector.
STEP 3. Measure the resistance at input shaft
speed sensor connector B-17.
Disconnect the connector, and measure the resist-
ance between terminal 1 and earth at the wiring har-
ness side.
OK: Continuity (Less than 2
Ω)
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 4.
STEP 4. Measure the voltage at A/T-ECU
connector C-12.
(1) Connect 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.43 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 5.
STEP 5. Connector check: C-12 A/T-ECU
connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the defective connector.
STEP 6. M.U.T.-III data list
Item 05: Input shaft speed sensor (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 7. 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 8.
NO :
Repair the defective connector.
STEP 8. Check the harness between input shaft
speed sensor connector B-17 terminal No.1 and
A/T-ECU connector C-12 terminal No.43.
Check the earth line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 9. Measure the voltage at input shaft speed
sensor connector B-17.
(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 12.
NO :
Go to Step 10.
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