Mitsubishi 380. Manual - part 368

 

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Mitsubishi 380. Manual - part 368

 

 

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-12

AUTOMATIC TRANSMISSION DIAGNOSIS

DIAGNOSTIC TROUBLESHOOTING FLOW

M1231013500353

INTRODUCTION TO A/T DIAGNOSIS

M1231012300226

The automatic transmission can exhibit any of the 
following symptoms: noise or vibration is generated, 
Transmission fluid leaks, the vehicle does not move 
forward or backward. The causes of these symptoms 
could come from: Incorrect mounting, the Transmis-
sion fluid may be low, or a component of the 
transmission may be faulty. 

The following items are suspected as causes for the 
INVECS-II troubles: malfunction of the A/T-ECU, the 
sensors, the switches, the harness or connectors.

 

Gather information from customer.

Check the  transmission fluid.

Verify complaint.

Replace or replenish the

transmission fluid.

Communication with the scan tool

MB991958 (MUT-III sub assembly)

not possible in Symptom Chart.

Read the diagnostic trouble code.

Erase the diagnostic trouble code.

Check symptom.

Perform the repair.

Road test

Recheck diagnostic trouble codes 

which were read before road test.

To DIAGNOSTIC TROUBLE CODE 

CHART

To SYMPTOM CHART

Search for cause.

Repair

Confirmation test (road test)

INTERMITTENT MALFUNCTIONS

(Refer to GROUP 00, How to Use

Troubleshooting/Inspection 

Service Points.)

Completed

NG

OK

Communication with the scan tool

MB991958 (MUT-III sub assembly)

not possible

Diagnostic trouble code

displayed.

No diagnostic trouble code

displayed.

Abnormality exists (no diagnostic 

trouble code)

Abnormality exists 

(diagnostic trouble 

code present)

No abnormality

No diagnostic trouble code

displayed.

Diagnostic trouble code

displayed.

Found

Not found

OK

OK

NG

AC210189

NG

AB

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-13

A/T DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1231007600339

Use these steps to plan your diagnostic strategy. If 
you follow them carefully, you will find most A/T mal-
functions.
1. Gather as much information as possible about the 

complaint from the customer.

2. Verify that the condition described by the 

customer exists.

3. Check the vehicle for any A/T Diagnostic Trouble 

Codes (DTCs).

4. If you can not verify the condition and there are no 

DTCs, the malfunction is intermittent. For 
information on how to cope with intermittent 
malfunctions, refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How 

to Cope with Intermittent Malfunction 

P.00-14

.

5. If you can verify the condition but there are no 

DTCs, or the system can not communicate with 
diagnostic tool, refer to the Symptom Chart 

P.23A-35

.

6. If there is a DTC, record the number of the code, 

then erase the code from memory using 
diagnostic tool.

7. Reconfirm the symptom with a Road Test.

8. If a DTC is set again, go to the Inspection Chart 

for Diagnostic Trouble Codes.

9. If a DTC is not set again, the malfunction is 

intermittent. For information on how to cope with 
intermittent malfunctions, refer to GROUP 00, 
How to Use Troubleshooting/Inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-14

.

10.After repairs are completed, conduct a Road Test 

duplicating the complaint conditions to confirm the 
malfunction has been eliminated.

DIAGNOSTIC FUNCTION

M1231022500135

CHECK "N" RANGE LIGHT

The "N" range light flashes once per second if there is an 
abnormality in any of the items in the table below which are 
related to the A/T system. Check for diagnostic trouble codes if 
the "N" range light is flashing once per second. 

NOTE: The "N" indicator lamp warning function does not 
operate with the selector lever in the "P" (PARK), "R" 
(REVERSE) or "N" (NEUTRAL) position. 

"N" range light flashing items

• Input shaft speed sensor

• Output shaft speed sensor

• Each solenoid valve

• Gear incorrect ratio

• A/T control relay system

CAUTION

If the "N" range light is flashing rapidly (twice per second), 
the transmission fluid temperature is too high. (It flashes 
when the fluid is approximately 125

°C or more and goes 

off when the fluid is approximately 115

°C or less)

ON-BOARD DIAGNOSTICS

The automatic transmission -electronic control unit 
(A/T-ECU) monitors its input/output signals (some 
signals all the time and others under specified condi-
tions). When an irregular signal is initially monitored, 
the A/T-ECU decides that a malfunction has 
occurred and records the occurrence as a diagnostic 
trouble code. The diagnostic results can be read with 

diagnostic tool. Diagnostic trouble codes are kept in 
memory by direct battery feed. The codes are 
retained in memory even if the ignition switch is in 
the "LOCK" (OFF) position. DTCs are not erased 
even after the battery terminals and the A/T-ECU 
connector are disconnected. In addition, the diagnos-
tic trouble code can also be erased by diagnostic 
tool.

10DB076A

NEUTRAL “N” INDICATOR LAMP

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-14

NOTE: If a sensor is disconnected when the ignition 
switch is in the "ON" position, a diagnostic trouble 
code is stored in memory. In this case, erase the 
DTC using diagnostic tool.

The diagnostic items are displayed in numeric order.

HOW TO CONNECT THE DIAGNOSTIC TOOL 
(MUT-III)

Required Special Tools:

•  MB991958: Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
1. Ensure that the ignition switch is at the "LOCK" (OFF) 

position.

2. Start up the personal computer.

3. Connect special tool MB991827 to special tool MB991824 

and the personal computer.

4. Connect special tool MB991910 to special tool MB991824.

5. Connect special tool MB991910 to the data link connector.

6. Turn the power switch of special tool MB991824 to the "ON" 

position.

NOTE: When special tool MB991824 is energized, special 
tool MB991824 indicator light will be illuminated in a green 
color.

7. Start the MUT-III system on the personal computer.

NOTE: Disconnecting diagnostic tool MB991958 is the reverse 
of the connecting sequence, making sure that the ignition 
switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC 
TROUBLE CODES

Required Special Tools:

•  MB991958: Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-15

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.

NOTE: If the battery voltage is low, diagnostic trouble codes 
will not be set. Check the battery if diagnostic tool 
MB991958 does not display.

1. Connect diagnostic tool MB991958 to the data link 

connector.

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

3. Select "Interactive Diagnosis" from the start-up screen.

4. Select "System select."

5. Choose "ELC-A/T" from the "POWER TRAIN" tab.

6. Select "MITSUBISHI."

7. Select "Diagnostic Trouble Code."

8. If a DTC is set, it is shown.

9. Choose "Erase DTCs" to erase the DTC.

HOW TO READ DATA LIST

Required Special Tools:

•  MB991958 : Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
1. Connect diagnostic tool MB991958 to the data link 

connector.

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

3. Select "Interactive Diagnosis" from the start-up screen.

4. Select "System select."

5. Choose "ELC-A/T" from the "POWER TRAIN" tab.

6. Select "MITSUBISHI."

7. Select "Data List."

8. Choose an appropriate item and select the "OK" button.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

 

 

 

 

 

 

 

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