Mitsubishi Galant 9G. Manual - part 530

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-198

STEP 11. Check PCM connector B-21 and A/T control
solenoid valve assembly connector B-108 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 12.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

AC306248AC

B-21
(B)

CONNECTOR: B-21

PCM

AIR
CLEANER

71 72

77 78 79

81 82

JAE

AC306322

CONNECTOR: B-108

B-108 (GR)

TRANSMISSION
RANGE SWITCH

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-199

STEP 12. Check the harness for an open or short circuit to
ground between PCM connector B-21 (terminals 54 and 56)
and A/T control solenoid valve assembly connector B-108
(terminals 6 and 7).
Q: Are the harness wires in good condition?

YES : Go to Step 13.
NO : Repair or replace the harness wire.

AC306248AC

B-21
(B)

CONNECTOR: B-21

PCM

AIR
CLEANER

71 72

77 78 79

81 82

JAE

AC306322

CONNECTOR: B-108

B-108 (GR)

TRANSMISSION
RANGE SWITCH

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-200

STEP 13. Check the harness for an open or short circuit to
ground between A/T control solenoid valve assembly
connector B-108 (terminals 6, 7, and 10) and solenoid
valve connectors B-108-4 and B-108-5.
Q: Is the harness wire in good condition?

YES : Replace the PCM.
NO : Replace the harness wire.

DTC 32 (P0758): Underdrive Solenoid Valve System

SOLENOID VALVE SYSTEM CIRCUIT

Refer to

P.23A-187

CIRCUIT OPERATION

Refer to

P.23A-187

DESCRIPTIONS OF MONITOR METHODS

• If solenoid terminal voltage is below specified

value when shift control is not in progress, PCM

judges that underdrive solenoid valve has a fail-

ure.

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 41 (P0731): 1st gear incorrect ratio

• DTC 42 (P0732): 2nd gear incorrect ratio

• DTC 43 (P0733): 3rd gear incorrect ratio

• DTC 44 (P0734): 4th gear incorrect ratio

• DTC 46 (P0736): Reverse gear incorrect ratio

• DTC 36 (P0743): Torque converter clutch sole-

noid malfunction

• DTC 31 (P0753): Low-reverse 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)

• Torque converter clutch solenoid

• Low-reverse solenoid

• Second solenoid

• Overdrive solenoid

• A/T control relay

AC306322

CONNECTOR: B-108

B-108 (GR)

TRANSMISSION
RANGE SWITCH

AC002219

CONNECTORS: B-108-4, B-108-5

B-108-4

B-108-5

VALVE BODY
ASSEMBLY

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-201

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 32 (P0758) 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 underdrive solenoid valve

• Damaged harness or connector

• Malfunction of the PCM

AC205282

Good

Malfunction

END

START

In-gear?

Shift solenoid-B is in ON
or OFF steady state

Voltage of battery > 10 V

Solenoid circuit
voltage < 3 V

Continuous failure
for 0.3 sec.

Yes

Underdrive solenoid valve
is in ON or OFF steady state

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