Mitsubishi Galant 9G. Manual — part 545
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-258
DTC 52 (P0741): Torque Converter Clutch System
.
DESCRIPTIONS OF MONITOR METHODS
• At start of lock-up operation, if lock-up clutch can-
not be engaged even when duty ratio of torque
converter clutch solenoid remains 100% for more
than specified time, PCM judges that torque con-
verter clutch is stuck OFF.
.
MONITOR EXECUTION
• Continuous
.
MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• DTC 21 (P0335): Crankshaft position sensor mal-
function
• DTC 22 (P0715): Input shaft speed sensor mal-
function
• DTC 23 (P0720): Output shaft speed sensor mal-
function
• DTC 53 (P0742): Torque converter clutch system
malfunction (Stuck ON)
• DTC 36 (P0743): Torque converter clutch sole-
noid malfunction
• DTC 31 (P0753): Low-reverse solenoid malfunc-
tion
• DTC 32 (P0758): Underdrive solenoid malfunc-
tion
• DTC 33 (P0763): Second solenoid malfunction
• DTC 34 (P0768): Overdrive solenoid malfunction
• DTC 54 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be
normal)
• Input shaft speed sensor
• Output shaft speed sensor
• Crankshaft position sensor
• Torque converter clutch solenoid
• Low-reverse solenoid
• Underdrive solenoid
• Second solenoid
• Overdrive solenoid
• A/T control relay
.
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-259
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• Solenoid status: plunging into connecting condi-
tion.
• Transmission range switch position: D, 3 or 2.
Judgement Criteria
• Time during 100% duty: 4 seconds or more.
.
OBD-II DRIVE CYCLE PATTERN
Start the engine, and drive at 100 km/h (62 mph) for
10 seconds. Then stop the vehicle, and turn OFF the
ignition switch. After that, restart the engine, and
drive again at 100 km/h (62 mph) for 10 seconds.
.
AC205238
START
END
Transmission range
switch position is in
D, 3 or 2 range
TCC is plunging
into connecting
condition?
TCC solenoid duty
ratio is 100%
Continuous failure for 4 secs.
Good
Malfunction
No
Yes
No
Yes
No
Yes
No
Yes
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-260
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Malfunction of the torque converter clutch sole-
noid valve
• Malfunction of the input shaft speed sensor
• Malfunction of the valve body
• Damaged harness or connector
• Malfunction of the PCM
• Malfunction of the torque converter
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
STEP 1. Using scan tool MB991958, read the A/T
diagnostic trouble code.
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) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 22 or 36 set?
, DTC 22: Input
Shaft Speed Sensor System.
, DTC 36: Torque
Converter Clutch Solenoid Valve System.
NO : Go to Step 2.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-261
STEP 2. Using scan tool MB991958, check data list item 36:
Torque Converter Clutch Solenoid Valve Duty%.
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) Start the engine. (Warming up engine)
(3) Set scan tool MB991958 to the data reading mode.
• Item 36: Torque Converter Clutch Solenoid Valve
Duty%.
• When driving at constant speed of 60 km/h (37
mph), the display should be "70
− 99.6%" (Gear
range: 3rd gear).
• When the accelerator pedal is released [at less than
50 km/h (31 mph)], the display should be "70
−
99.6%
→ 0%" (decreases gradually as the vehicle
speed decreases) (Gear range: 3rd gear).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?
YES : Go to Step 3.
NO : Go to Step 5.
STEP 3. Using scan tool MB991958, check data list item 52:
Torque Converter Clutch Amount of Slippage.
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) Start the engine. (Warming up engine)
(3) Set scan tool MB991958 to the data reading mode.
• Item 52: Torque Converter Clutch Amount of Slippage.
• Driving at a constant speed of 60 km/h (37 mph), the
display should be "
−10 to 10 r/min."
• If the accelerator pedal is released, the display on
the scan tool changes (50 km/h (31 mph) and less).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the clutch operating properly?
YES : Go to Step 4.
NO : Go to Step 5.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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