Mitsubishi Galant (2004+). Manual - part 668

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-223

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Solenoid status: either solid ON or OFF.

• Shift status: in-gear.

• Voltage of battery: 10 volts or more.

Judgement Criteria

• Solenoid voltage: 3 volts or less. (0.3 second)

• If DTC 34 (P0768) 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
Start the engine, and keep the vehicle stopped in "P" 
range for 5 seconds.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Malfunction of the overdrive solenoid valve

• Damaged harness or connector

• Malfunction of the PCM

AC205284

Good

Malfunction

END

START

In-gear?

Shift solenoid-D is in ON 
or OFF steady state

Voltage of battery > 10 V

Solenoid circuit 
voltage < 3 V

Continuous failure 
for 0.3 sec.

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Overdrive solenoid valve is in 
    ON or OFF steady state

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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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, check actuator test 
item 04: Overdrive Solenoid Valve.

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) Set scan tool MB991958 to the actuator test mode.

• Item 04: Overdrive Solenoid Valve.

• An audible clicking or buzzing should be heard when 

the overdrive solenoid valve is energized.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-6

.

NO :  Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 2. Using scan tool MB991958, read the A/T 
diagnostic trouble code.

(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 54 set? (DTC 54 may be set along with multiple 

DTCs).
YES : Refer to 

P.23A-267

 DTC 54: A/T Control Relay 

System.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the A/T 
diagnostic trouble code.

(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: Are DTC 32 and DTC 33 set? (Multiple DTCs may be set).

YES : Go to Step 8.
NO :  Go to Step 4.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 4. Measure the Overdrive solenoid valve resistance 
at A/T control solenoid valve assembly connector B-108.

(1) Disconnect connector B-108 and measure at the solenoid 

valve side.

(2) Measure the resistance between solenoid valve assembly 

connector B-108 terminals 5 and 9.

Resistance value: 2.7

−3.4 Ω [at 20°C (68°F)]

Q: Is the measured resistance 2.7

−3.4 Ω [at 20°C (68°F)]?

YES : Go to Step 6.
NO :  Go to Step 5.

STEP 5. Measure the solenoid valve resistance at the 
overdrive solenoid valve assembly inside the transaxle.

(1) Disconnect connector B-108-3 and measure at the solenoid 

valve side.

(2) Measure the resistance between Overdrive solenoid valve 

terminals 1 and 2.

Resistance value: 2.7

−3.4 Ω [at 20°C (68°F)]

Q: Is the measured resistance 2.7

−3.4 Ω [at 20°C (68°F)?

YES : Replace the harness wire between A/T control 

solenoid valve assembly connector B-108 and the 
solenoid valves.

NO :  Replace the Overdrive solenoid valve. Refer to 

GROUP 23B, Valve Body 

P.23B-79

.

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AC210692

2

7

1

8

3

9

4

6

10

5

AB

B-108 HARNESS CONNECTOR: 
A/T CONTROL SOLENOID VALVE 
ASSEMBLY SIDE

AC002219

CONNECTOR: B-108-3

BZ

B-108-3

VALVE BODY
ASSEMBLY

2

1

AC201141

B-180-3 HARNESS CONNECTOR: 
OVERDRIVE 
SOLENOID VALVE SIDE

BC