Mitsubishi Galant (2004+). Manual — part 676
AUTOMATIC TRANSAXLE DIAGNOSIS
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DTC SET CONDITIONS <DTC 46 (P0736)>
Check Conditions
• Engine speed: 450 r/min or more.
• Output speed: 350 r/min or more.
• Shift stage: reverse gear.
• Input speed: more than 0 r/min.
• Transmission fluid temperature sensor voltage:
4.5 volts or less.
• Voltage of battery: 10 volts or more.
• Transmission range switch rationality: only one
signal.
• Time after shift changing finish: 2 seconds or
more.
Judgement Criteria
• Output speed: [(input speed + 200 r/min) /
reverse gear ratio] or more. (4 seconds)
• Output speed: [(input speed - 200 r/min) / reverse
gear ratio] or less. (4 seconds)
• If DTC 46 (P0736) is set consecutively four times,
the transaxle is locked into 3rd gear as a fail-safe
measure, and the "N" range light flashes once
per second.
.
OBD-II DRIVE CYCLE PATTERN <DTC 46
(P0736)>
Start the engine, and drive in "R" range at 15 km/h (9
mph) or more for 10 seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Malfunction of the input shaft speed sensor
• Malfunction of the output shaft speed sensor
• Malfunction of the PCM
• Malfunction of the underdrive clutch retainer
• Malfunction of the transfer drive gear or driven
gear
• Malfunction of the low-reverse brake system
(DTC 41 or DTC 46)
• Malfunction of the underdrive clutch system (DTC
41, DTC 42, or DTC 43)
• Malfunction of the second brake system (DTC 42
or DTC 44)
• Malfunction of the overdrive clutch system (DTC
43 or DTC 44)
• Malfunction of the reverse clutch system (DTC
46)
• Electrical noise generated
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
AUTOMATIC TRANSAXLE DIAGNOSIS
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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 set?
YES <DTC 22 set> : Refer to
, DTC 22: Input
Shaft Speed Sensor System.
YES <DTC 23 set> : Refer to
, DTC 23: Output
Shaft Speed Sensor System.
YES <DTC 31 set> : Refer to
, DTC 31:
Low-Reverse Solenoid Valve System.
YES <DTC 32 set> : Refer to
, DTC 32:
Underdrive Solenoid Valve System.
YES <DTC 33 set> : Refer to
, DTC 33: Second
Solenoid Valve System.
YES <DTC 34 set> : Refer to
, DTC 34:
Overdrive Solenoid Valve System.
NO : Go to Step 2.
STEP 2. Check the hydraulic pressure.
Each hydraulic pressure of the elements below, which DTCs
indicate, should be within the standard value.
• DTC 41: Underdrive clutch and low-reverse brake.
• DTC 42: Underdrive clutch and second brake
• DTC 43: Underdrive clutch and overdrive clutch
• DTC 44: Overdrive clutch and second brake
• DTC 46: Reverse clutch and low-reverse brake
Q: Does the hydraulic pressures meet the standard value
range?
YES : Go to Step 5.
NO <out of the range in one place> : Go to Step 4.
NO <out of the range in all places> : Go to Step 3.
STEP 3. Adjust the line pressure.
Adjust the line pressure. Refer to
, Line Pressure
Adjustment. Then check the symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
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STEP 4. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and the valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body
.
Replace the valve body assembly if the damages are thought
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 6.
STEP 5. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Were any A/T DTCs set?
YES : Go to Step 6.
NO : The procedure is complete.
STEP 6. Overhaul the A/T.
(1) Replace the following parts.
• If DTC 41, DTC 42, or DTC 43 are set individually or in a
group, replace the underdrive clutch. Refer to GROUP
23B, Underdrive Clutch and Input Shaft
.
• If DTC 43 or DTC 44 are set individually or in a group,
replace the overdrive clutch. Refer to GROUP 23B,
Reverse and Overdrive Clutch
• If DTC 46 is set, replace the reverse clutch. Refer to
GROUP 23B, Reverse and Overdrive Clutch
• If DTC 41 or DTC 46 are set individually or in a group,
replace the low-reverse brake. Refer to GROUP 23B,
Transaxle
.
• If DTC 42 or DTC 44 are set individually or in a group,
replace the second brake. Refer to GROUP 23B, Tran-
saxle
.
• If DTC 41 is set, replace the one-way clutch. Refer to
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Are any A/T DTCs set again?
YES : An A/T DTC may have set due to external radio
frequency interference (RFI) possibly caused by
cellular phone activity, or aftermarket components
installed on the vehicle.
NO : The procedure is complete.
AC001860 AB
VALVE
BODY
ASSEMBLY
AC001868
REVERSE
CLUTCH
SECOND
BRAKE
LOW-
REVERSE
BRAKE
UNDERDRIVE
CLUTCH
OVERDRIVE CLUTCH
AB
AUTOMATIC TRANSAXLE DIAGNOSIS
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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
.
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