Mitsubishi Galant. Manual — part 402

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-75

STEP 4. Using scan tool MB991502, check data list item 15:
A/T Fluid Temperature Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991502 to data reading mode for item 15:

A/T Fluid Temperature Sensor.

•

At cool condition: Almost equal to the ambient
temperature (atmospheric temperature)

•

At warm condition: 70 to 80

°

C (158 to 176

°

F)

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : This malfunction is intermittent. Refer to GROUP 00,

How to Use Troubleshooting/Inspection Service
Points

−

How to Cope with Intermittent Malfunction

P.00-8

.

NO : Replace the PCM.

STEP 5. Check connectors C-40, C-42 at PCM and B-38 at
A/T control solenoid valve assembly for damage.
Q: Are the harness connectors in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

AC003081AC

MB991502

DATA LINK
CONNECTOR

AC004197

PCM

C-40

C-42

CONNECTORS: C-40, C-42

AE

ACX02479

CONNECTOR: B-38

AF

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 6. Check the A/T fluid temperature sensor at A/T
control solenoid valve assembly connector B-38.
(1) Disconnect connector B-38 and measure at the sensor

side.

(2) Measure the resistance between terminal 1 and 2.

•

When A/T fluid temperature is 0

°

C (32

°

F), resistance

should be between 16.7 and 20.5 ohm.

•

When A/T fluid temperature is 20

°

C (68

°

F), resistance

should be between 7.3 and 8.9 ohm.

•

When A/T fluid temperature is 40

°

C (104

°

F), resistance

should be between 3.4 and 4.2 ohm.

•

When A/T fluid temperature is 80

°

C (176

°

F), resistance

should be between 1.9 and 2.2 ohm.

•

When A/T fluid temperature is 100

°

C (212

°

F),

resistance should be between 0.57 and 0.69 ohm.

Q: Is the resistance normal?

YES : Go to Step 7.
NO : Replace the A/T fluid temperature sensor. Refer to

GROUP 23B, Transaxle

P.23B-10

.

STEP 7. Check the power supply voltage at A/T control
solenoid valve assembly connector B-38.
(1) Disconnect connector B-38 and measure at the harness

side.

(2) Turn the ignition switch to "ON" position.

(3) Measure the voltage between terminal 1 and ground.

•

Voltage should be between 4.5 and 4.9 volts.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 8.
NO : Repair it because of harness short circuit to ground

between A/T control solenoid valve assembly
connector B-38 terminal 1 and PCM connector C-42
terminal 124.

ACX02479

CONNECTOR: B-38

AF

ACX02103

HARNESS
CONNECTOR: B-38

AE

ACX02479

CONNECTOR: B-38

AF

ACX02104

HARNESS
CONNECTOR: B-38

AE

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 8. Check harness for damage between A/T control
solenoid valve assembly connector B-38 terminal 1 and
PCM connector C-42 terminal 124.
Q: Is the harness wire in good condition?

YES : Repair it because of harness damage between

solenoid valve Assy connector B-38 terminal 2 and
PCM connector C-42 terminal 57.

NO : Repair it.

ACX02479

CONNECTOR: B-38

AF

AC004197

PCM

AF

CONNECTOR: C-42

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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DTC 21: Crankshaft Position Sensor System

AC004612

Crankshaft Position Sensor System Circuit

AB

AC004286 AB

MFI RELAY

BATTERY

CONNECTOR: A-21X

AC004909

CONNECTOR: B-20
<2.4L ENGINE>

AB