Mitsubishi Galant (2004+). Manual - part 676

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-255

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 

P.23A-70

, DTC 22: Input 

Shaft Speed Sensor System.

YES <DTC 23 set> : Refer to 

P.23A-91

, DTC 23: Output 

Shaft Speed Sensor System.

YES <DTC 31 set> : Refer to 

P.23A-188

, DTC 31: 

Low-Reverse Solenoid Valve System.

YES <DTC 32 set> : Refer to 

P.23A-200

, DTC 32: 

Underdrive Solenoid Valve System.

YES <DTC 33 set> : Refer to 

P.23A-211

, DTC 33: Second 

Solenoid Valve System.

YES <DTC 34 set> : Refer to 

P.23A-222

, 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. 

P.23A-29

.

• 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 

P.23A-42

, 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 

P.23B-79

.

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 

P.23B-60

.

• 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 

P.23B-62

.

• If DTC 46 is set, replace the reverse clutch. Refer to 

GROUP 23B, Reverse and Overdrive Clutch 

P.23B-62

.

• If DTC 41 or DTC 46 are set individually or in a group, 

replace the low-reverse brake. Refer to GROUP 23B, 
Transaxle 

P.23B-10

.

• If DTC 42 or DTC 44 are set individually or in a group, 

replace the second brake. Refer to GROUP 23B, Tran-
saxle 

P.23B-10

.

• If DTC 41 is set, replace the one-way clutch. Refer to 

GROUP 23B, Planetary Gear 

P.23B-70

.

(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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AUTOMATIC TRANSAXLE

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DTC 52 (P0741): Torque Converter Clutch System

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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

.