Mitsubishi Outlander GS45X. Manual — part 1679
AUTOMATIC TRANSAXLE DIAGNOSIS <A/T>
TSB Revision
AUTOMATIC TRANSAXLE
23C-21
HOW TO DIAGNOSE THE CAN BUS LINES
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "CAN Bus Diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it
matches the vehicle whose CAN bus lines will be
diagnosed.
• If they match, go to step 8.
• If not, go to step 5.
5. Select the "view vehicle information" button.
6. Enter the vehicle information and select the "OK" button.
7. When the vehicle information is displayed, confirm again
that it matches the vehicle whose CAN bus lines will be
diagnosed.
• If they match, go to step 8.
• If not, go to step 5.
8. Select the "OK" button.
9. When the optional equipment screen is displayed, choose
the one which the vehicle is fitted with, and then select the
"OK" button.
HOW TO INITIALIZE A/T LEARNED VALUE
M1231022600325
PURPOSE
A/T learned value must be reset whenever the auto-
matic transaxle, engine assembly, A/T valve body, or
A/T solenoid valve is replaced. It cannot be reset by
disconnecting the battery. Use the M.U.T.-III as fol-
lows:
INITIALIZATION PROCEDURE
1. Move the selector lever to the P range and turn
the ignition switch to the LOCK (OFF) position.
Then, connect scan tool to the data link connector.
2. Turn the ignition switch to the ON position, and
then move the selector lever to the R range.
3. Depress the accelerator pedal while depressing
the brake pedal. (Engine is not running.) Using
the M.U.T.-III, execute the clear DTC function for
the TCM (even if no codes are set).
NOTE: Performing initialization of the learned value
will also erase the diagnostic trouble code.
ZC501967
AC404789
AC701411AB
MB991824
MB991827
MB991910
Data link
connector
AUTOMATIC TRANSAXLE DIAGNOSIS <A/T>
TSB Revision
AUTOMATIC TRANSAXLE
23C-22
FAIL-SAFE/BACKUP FUNCTION
M1231008300375
When a malfunction of a main sensor or actuator is
detected by the PCM, the transaxle is controlled by
pre-set control logic to maintain safe conditions for
driving.
The following table shows how the fail-safe/backup
function affects vehicle driveability and operation.
DTC code
No.
Detection items
Fail-safe
P0703
Stoplight switch malfunction
• The lock-up operation range is shifted to
the high speed side.
• Inter lock detection is prohibited.
P0705
Transmission range switch system
• Fixed at the D range.
• Manual mode is prohibited.
• Lock-up is prohibited.
P0712
Transmission fluid temperature sensor system
(Short circuit)
Not present.
P0713
Transmission fluid temperature sensor system
(Open circuit)
Fixed to 5th gear during driving, and to 3rd
gear after a vehicle stop.
P0715
Input shaft speed sensor system
• Fixed to the driving gear position during
driving, and to 3rd gear after a vehicle stop.
P0720
Output shaft speed sensor system
P0729
6th gear incorrect ratio
The current shift position is continued, and
gear is fixed to 3rd gear after a vehicle stop.
P0731
1st gear incorrect ratio
• At engine runup detection: Fixed to 5th gear
after a vehicle stop.
• At gear ratio abnormality detection: Fixed to
2nd, 3rd, 4th gear.
P0732
2nd gear incorrect ratio
The current shift position is continued, and
gear is fixed to 5th gear after a vehicle stop.
P0733
3rd gear ratio
The current shift position is continued, and
gear is fixed to 6th gear after a vehicle stop.
P0734
4th gear incorrect ratio
The current shift position is continued, and
gear is fixed to 3rd or 5th gear after a vehicle
stop.
P0735
5th gear incorrect ratio
The current shift position is continued, and
gear is fixed to 2nd gear after a vehicle stop.
P0736
Reverse gear incorrect ratio
Controlled by making the line pressure to
maximum.
P0741
Torque converter clutch system (Stuck off)
Lock-up is prohibited.
P0742
Torque converter clutch system (Stuck on)
Lock-up is prohibited.
P0743
Lock-up and Low-reverse brake linear solenoid
valve system
Fixed to 5th gear during driving and to 3rd
gear after a vehicle stop.
P0748
Line pressure linear solenoid valve system
Controlled by making the line pressure to
maximum.
P0753
Low clutch linear solenoid valve system
Fixed to 5th gear.
AUTOMATIC TRANSAXLE DIAGNOSIS <A/T>
TSB Revision
AUTOMATIC TRANSAXLE
23C-23
*1
: Indicates the series of driving cycle "ignition key
OFF
→ ON → drive → OFF."
P0758
2-6 brake linear solenoid valve system
Fixed to 5th gear during driving, and to 3rd
gear after a vehicle stop.
P0763
3-5 reverse clutch linear solenoid valve system Fixed to 5th gear during driving, and to 3rd
gear after a vehicle stop.
P0768
High clutch linear solenoid valve system
Fixed to 5th gear.
P0815
Paddle shift switch (up) system
The manual mode operation during the driving
cycle
*1
in question is prohibited.
P0816
Paddle shift switch (down) system
The manual mode operation during the driving
cycle
*1
in question is prohibited.
P0826
Shift switch assembly system
The manual mode during the driving cycle
*1
in
question is prohibited.
P0846
2-6 brake pressure switch system
Control is continued with always switch on.
P0876
High clutch pressure switch system
Control is continued with always switch on.
P0893
Interlock detection
Fixed to a feasible shift position.
P0988
Low-reverse brake pressure switch system
Control is continued with always switch on.
P1705
Throttle position sensor information (engine)
• Controlled with the throttle position fixed to
2/8 position.
• Lock-up is prohibited.
P1706
Accelerator pedal position information
• Controlled with the throttle position fixed to
2/8 position.
• Lock-up is prohibited.
P1731
1st engine brake detection
The low-reverse brake is released.
P1753
Low clutch shift solenoid valve system
Not present.
P1758
Low-reverse brake shift solenoid valve system Fixed to 5th gear during driving, and to 3rd
gear after a vehicle stop.
P1773
ABS Information (ASC)
The lock-up during the deceleration and when
vehicle speed is 40 km/h (25 mph) or less is
prohibited.
P1796
Idle neutral control
Idle neutral control is prohibited.
U0001
CAN bus off
Fixed to 5th gear during driving, and to 3rd
gear after a vehicle stop.
U0100
ECM time out
Fixed to 5th gear during driving, and to 3rd
gear after a vehicle stop.
U0121
ASC-ECU time out
No action
U0141
ETACS-ECU time out
Judges as brake ON, and continues control.
DTC code
No.
Detection items
Fail-safe
AUTOMATIC TRANSAXLE DIAGNOSIS <A/T>
TSB Revision
AUTOMATIC TRANSAXLE
23C-24
ROAD TEST
M1231007800979
This test is performed to make a proper judgment on
the trouble symptom and check after completion of
service work.
1. With the actual driving, check if there is any
abnormality in transmission.
2. Check if there is any shift shock or abnormal
sound.
3. Check the driving status with all the shift ranges
including "R."
4. Perform the driving test with the reproduction
condition which is investigated in the interview to
check the failure occurrence.
.
P-range test
1. Stop the vehicle completely on an upslope at the
gradient of 5
° to 10°, and then shift the selector
lever to the "P" range. After that, release the foot
brake gradually to check that the vehicle does not
move.
2. With the status of the above Step 1, shift the
selector lever from the "P" range to other ranges,
and check that the vehicle moves.
3. Check the operation also on the downslope with
the same manner.
.
Select time lag
CAUTION
• Perform the test with the engine fully warmed
up and the idling speed being stable.
• On completion of the first test, when one
minute or more has elapsed after the selector
lever is returned from another position to the
"N" range, perform the following tests.
1. Check the transmission fluid level and properties.
2. Check the transaxle control cable and linkage.
3. Chock the front and rear wheels on a level
surface, and depress the foot brake to stop the
vehicle.
4. Start the engine, and shift the selector lever from
the "N" range to the "D" range. At this time,
measure the time from the lever selection to
shock occurrence using a stop watch.
Standard value:
− select time lag: 0.8 sec-
onds
5. With the same manner, measure the select time
from the "N" range to the "R" range.
Standard value:
− select time lag: 0.8 sec-
onds
If the measured value is abnormally large exceeding
one second, the operating hydraulic pressure reduc-
tion and the A/T internal clutch slippage are assumed
to have occurred.
TORQUE CONVERTER STALL TEST
M1231005400629
This test measures the maximum engine speed
when the selector lever is in the "D" position and the
torque converter stalls. This tests the operation of the
torque converter, stator and one-way clutch opera-
tion, as well as the holding performance of the
clutches and brakes in the transaxle.
WARNING
Do not let anyone stand in front of or behind
the vehicle while this test is performed.
1. Check the transmission fluid level and
temperature. Check the engine coolant
temperature.
• Transmission fluid level: At the "HOT" mark on
the dipstick
• Transmission fluid temperature: 70 − 80°C (158 −
176
°F)
• Engine coolant temperature: 80 − 100°C (176 −
212
°F)
NOTE: Measure transmission fluid temperature
with scan tool MB991958 (M.U.T.-III sub assem-
bly).
2. Chock both rear wheels.
3. Connect a tachometer.
4. Apply the parking and service brakes fully.
5. Start the engine.
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