Mitsubishi Galant. Manual — part 386

GENERAL DESCRIPTION

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AUTOMATIC TRANSAXLE

23A-11

SHIFT PATTERN CONTROL

<2.4L ENGINE> UPSHIFT PATTERN

<2.4L ENGINE> DOWNSHIFT PATTERN

AC001949AC

100

50

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

1

2

2

3

3

4

THROTTLE
OPENING (%)

2

→

3

MOVEMENT
RANGE

3

→

4

MOVEMENT
RANGE

0 (0)

50 (31)

100 (62)

150 (93)

200 (124)

OUTPUT SHAFT SPEED (r/min)

VEHICLE SPEED [km/h (mph)]

THICK LINE: STANDARD SHIFT PATTERN

AC001950

100

50

0

0(0)

1,000

2,000

3,000

4,000

5,000

6,000

7,000

50 (31)

100 (62)

150 (93)

200 (124)

1

2

2

3

3

4

1

2 (L)

2

3 (2,L)

3

4 (3,2,L)

THROTTLE
OPENING (%)

OUTPUT SHAFT SPEED (r/min)

VEHICLE SPEED [km/h (mph)]

AC

GENERAL DESCRIPTION

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AUTOMATIC TRANSAXLE

23A-12

<3.0L ENGINE> UPSHIFT PATTERN

<3.0L ENGINE> DOWNSHIFT PATTERN

AC004258

100

50

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

0 (0)

50 (31)

100 (62)

150 (93)

200 (124)

THROTTLE
OPENING (%)

OUTPUT SHAFT SPEED (r/min)

VEHICLE SPEED [km/h (mph)]

1

2

2

3

3

4

2

→

3

MOVEMENT
RANGE

3

→

4

MOVEMENT
RANGE

THICK LINE: STANDARD SHIFT PATTERN

AB

AC004259

100

50

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

0 (0)

50 (31)

100 (62)

150 (93)

200 (124)

1

2

2

3

3

4

1

2 (L)

2

3 (2, L)

3

4 (3, 2, L)

THROTTLE
OPENING (%)

OUTPUT SHAFT SPEED (r/min)

VEHICLE SPEED [km/h (mph)]

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-13

AU TO M ATIC TR A N SA XLE DIAG NO SIS

DIAGNOSTIC TROUBLESHOOTING FLOW

M1231013500029

INTRODUCTION TO A/T DIAGNOSIS

M1231012300055

The mounting could be incorrect, the A/T fluid may
be low, or a component of the transaxle may be
faulty in the following conditions: noise or vibration is
generated, A/T fluid leaks, the vehicle does not move
forward or backward.

The following items are suspected as causes for the
INVECS-II troubles: malfunctions of the PCM, the
sensors, the switches, the harness or connectors.

A/T DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1231007600072

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find an

A/T fault.

Gather information from customer.

Check the automatic transmission
fluid.

Verify complaint.

Replace or replenish the automatic
transmission fluid.

Communication with the scan tool
(MUT-II) not possible in Symptom
Chart.

Read the diagnostic trouble code.

Erase the diagnostic trouble code.

Check trouble symptom.

Performing the essential service.

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 (MUT-II) 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

NG

OK

OK

NG

AC005120AB

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-14

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

Code (DTC).

4. If you cannot 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.00-8

.

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

DTCs, or the system cannot communicate with
the scan tool, refer to the Symptom Chart.

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

then erase the code from memory using the scan
tool.

7. Reconfirm the symptom using the Road Test.

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

Diagnostic Trouble Codes.

9. If 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.00-8

.

10.After repairs are completed, conduct a Road Test

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

A/T DIAGNOSTIC TROUBLE CODE DIAGNOSIS

M1231007700057

ON-BOARD DIAGNOSTICS

The powertrain control module (PCM) monitors its
input/output signals (some signals all time and others
under specified conditions). When an irregular signal
is initially monitored, the PCM decides that a
malfunction has occurred. There are 25 diagnostic
items. The diagnostic results can be read with a scan
tool. Diagnostic trouble codes are kept in memory by
direct battery feed. The codes are retained in
memory if the ignition switch is "LOCK" (OFF).

Diagnostic trouble codes will, however, be erased
when a battery terminal or the PCM connector is
disconnected. In addition, the diagnostic trouble
code can also be erased by the scan tool MUT-II
(MB991502).

NOTE: If a sensor is disconnected with the ignition
switch is "ON," a diagnostic trouble code is
memorized. In this case, erase the DTC using the
scan tool.
The 25 diagnostic items are all indicated sequentially
from the smallest code number.

HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES

Required Special Tools:
MB991502: Scan Tool (MUT-II)

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.

NOTE: If the battery positive voltage is low, diagnostic trouble
codes will not be output. Check the battery if the scan tool
cannot display.

NOTE: If the battery is disconnected or if the powertrain
control module connector is disconnected, the diagnostic
trouble codes will be erased. Do not disconnect the battery or
powertrain control module before the diagnostic trouble codes
have been read.