Subaru Legacy IV (2008 year). Manual — part 747

5AT(diag)-3

Basic Diagnostic Procedure

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

6

PERFORM DIAGNOSIS.
1) Inspect using “Diagnostic Procedure with
Diagnostic Trouble Code (DTC)”. <Ref. to
5AT(diag)-35, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>

NOTE:
For DTC table, refer to “List of Diagnostic Trou-
ble Code (DTC)”. <Ref. to 5AT(diag)-32, List of
Diagnostic Trouble Code (DTC).>
2) Repair the trouble cause.
3) Perform the Clear Memory Mode.
4) Perform the Inspection Mode. <Ref. to
5AT(diag)-22, Inspection Mode.>
5) Display DTC.

Is DTC displayed?

Inspect using
“Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC)”. <Ref. to
5AT(diag)-35,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>

Inspect using
“General Diagnos-
tic Table”. <Ref. to
5AT(diag)-113,
General Diagnos-
tic Table.>

Step

Check

Yes

No

5AT(diag)-4

Check List for Interview

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

2. Check List for Interview

A: CHECK

Check the following items when a problem has occurred.

NOTE:
Use copies of this page for interviewing customers.

Customer’s name

Date of purchase

Date of repair

Transmission model

Transmission

V.I.N.

Odometer reading

km (miles)

Symptom

No up-shift

No down-shift

No kick down

Vehicle does not move (

Any position

Particular position)

Lock-up malfunction

Noise or vibration

Shift shock or slip

Select lever does not move

Others

(

)

Frequency

Continuous

Intermittent (

times a day)

Weather

Fine

Cloudy

Rainy

Snowy

Others

(

)

Place

Highland

Suburbs

Inner city

Uphill

Rough road

Others

(

)

Ambient air temperature

Hot

Warm

Cool

Cold

Vehicle speed

km/h (MPH)

AT warning light (AT OIL TEMP light)

Blinks continuously

Does not blink

Select lever position

P

R

N

D

Manual mode

Driving condition

Not affected
At racing
While decelerating

At starting
While accelerating
While turning

(

RH/

LH)

While idling
While cruising

Manual mode

ON

OFF

5AT(diag)-5

General Description

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

3. General Description

A: CAUTION

1. SUPPLEMENTAL RESTRAINT SYSTEM
“AIRBAG”

The airbag system wiring harness is routed near
the TCM.

CAUTION:
• All the airbag system wiring harnesses and
connectors are colored yellow. Do not use an
electric test equipment to check these circuits.
• Be careful not to damage the airbag system
wiring harness when performing diagnostics or
servicing the TCM.

2. MEASUREMENT

When measuring the voltage and resistance of the
ECM, TCM or each sensor, use a tapered pin with
a diameter of less than 0.64 mm (0.025 in) in order
to avoid poor contact. Do not insert a pin of more
than 0.65 mm (0.026 in) diameter.

B: INSPECTION

1. BATTERY

Measure the battery voltage and specific gravity of
the electrolyte.

Standard voltage:

12 V or more

Specific gravity:

1.260 or more

2. TRANSMISSION GROUND

Make sure that the ground terminal bolt is tightened
securely.

Tightening torque:

13 N·m (1.3 kgf-m, 9.4 ft-lb)

3. ATF LEVEL

Make sure that ATF level is the specified amount.
<Ref. to 5AT-28, INSPECTION, Automatic Trans-
mission Fluid.>

4. FRONT DIFFERENTIAL OIL LEVEL

Make sure the front differential oil level is the spec-
ified amount. <Ref. to 5AT-30, INSPECTION, Dif-
ferential Gear Oil.>

AT-01464

(A) Oil level gauge

(B) Inspection position when “HOT”

(C) Upper level

(D) Lower level

(E) Inspection position when “COLD”

(A) Oil level gauge

(B) Upper level

(C) Lower level

(A)

PI-00362

COLD

LF

HOT

LF

(A)

(B)

(D)

(E)

(D)

(C)

(C)

PI-00184

(A)

(C)

(B)

(A)

F

L

5AT(diag)-6

General Description

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

5. OPERATION OF SHIFT SELECT LEVER

Make sure there is no noise, dragging or contact
pattern in each select lever range.

WARNING:
Stop the engine while checking operation of the
select lever.

AT-02048