Mitsubishi Galant (2004+). Manual - part 677

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

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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?

YES <DTC 22 set> : Refer to 

P.23A-70

, DTC 22: Input 

Shaft Speed Sensor System.

YES <DTC 36 set> : Refer to 

P.23A-233

, DTC 36: Torque 

Converter Clutch Solenoid Valve System.

NO :  Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSAXLE DIAGNOSIS

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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

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-262

STEP 4. 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 52 set?

YES : Replace the PCM.
NO :  The procedure is complete.

STEP 5. Check the hydraulic pressure (for torque 
converter).

Measure the hydraulic pressure for torque converter. Check if 
the hydraulic pressure is within the standard value. Refer to 

P.23A-29

, Hydraulic Pressure Test.

Q: Is the hydraulic pressure within the standard value?

YES : Go to Step 7.
NO :  Go to Step 6.

STEP 6. Adjust line pressure.

Adjust line pressure. Refer to 

P.23A-42

, Line Pressure Adjust-

ment. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 8.

STEP 7. Replace the PCM.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 8.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827