Automatic Transmission: Overview Subaru Forester SG

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ENGINE BRAKE OPERATION

1. Check the 3rd gear engine brake when shifting between D <=> 3rd range while driving in 4th gear of D range [50 to 60 km/h (31 to 37 MPH)].
2. Check the 2nd gear engine brake when shifting between 3 <=> 2 range while driving in the 3 range 3rd gear [40 to 50 km/h (25 to 31 MPH)].
3. Check the 1st gear engine brake when shifting between 2 <=> 1 range while driving in the 2 range 2nd gear [20 to 30 km/h (12 to 19 MPH)].

P RANGE OPERATION

Stop the vehicle on an uphill grade of 5% or more and shift to "P" range. Check that the vehicle does not move when the parking brake is released.

GENERAL INFORMATION

The stall test is of extreme importance in diagnosing the condition of the automatic transmission and the engine. It should be conducted to measure the engine stall speeds in "R" and "2" ranges.

Purposes of the stall test

1. To check the operation of the automatic transmission clutch.
2. To check the operation of the torque converter clutch.
3. To check engine performance.

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1. Preparations before test: Check that throttle valve opens fully. Check that engine oil level is correct. Check that coolant level is correct. Check that ATF level is correct. Check that differential gear oil level is correct. Increase ATF temperature to 50 to 80°C (122 to 176°F) by idling the engine for approx. 30 minutes (with select lever set to "N" or "P").
2. Place the wheel chocks at the front and rear of all wheels and engage the parking brake.
3. Move the manual linkage to ensure it operates properly, and shift the select lever to the "2" range.
4. While forcibly depressing the foot brake pedal, gradually depress the accelerator pedal until the engine operates at full throttle.
5. When the engine speed is stabilized, record that speed quickly and release the accelerator pedal.
6. Shift the select lever to "N" range, and cool down the engine by idling it for more than one minute.
7. If the stall speed in "2" range is higher than specifications, low clutch slipping and 2-4 brake slipping may occur. To identify it, conduct the same test as above in "R" range.
8. Perform the stall tests with the select lever in "D" range. NOTE: Do not continue the stall test for MORE THAN 5 SECONDS at a time (from closed throttle, fully open throttle to stall speed reading). Failure to follow this instruction causes the engine oil and ATF to deteriorate and the clutch and brake to be adversely affected. Be sure to cool down the engine for at least 1 minute after each stall test with the select lever set in the "P" or "N" range and with the idle speed lower than 1,200 rpm. If the stall speed is higher than the specified range, attempt to finish the stall test in as short a time as possible, in order to prevent the automatic transmission from sustaining damage. Stall speed (at sea level): 1,900 - 2,600 rpm

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If the select lever is shifted while the engine is idling, there will be a certain time elapse or lag before the shock can be felt. This is used for checking the condition of the low clutch, reverse clutch, low & reverse brake and one-way clutch.

Note. Perform the test at normal operating fluid temperature 60 to 80°C (140 to 176°F). Be sure to allow a 1 minute interval between tests. Make three measurements and take the average value.

If the clutch or the brake shows a sign of slippage or shifting sensation is not correct, the line pressure should be checked.

1. Excessive shocks during upshifting or shifting takes place at a higher point than under normal circumstances, may be due to the line pressure being too high.
2. Slippage or inability to operate the vehicle may, in most cases, be due to loss of oil pressure for the operation of the clutch, brake or control valve.

1. Line pressure measurement (under no load) NOTE: Before measuring the line pressure, jack-up all wheels. Maintain the temperature of ATF at approx. 50°C (122°F) during measurement. (ATF will reach the above temperature after idling the engine for approx. 30 minutes with select lever in "N" or "P".)
2. Line pressure measurement (under heavy load) NOTE: Before measuring the line pressure, apply both foot and parking brakes with all wheels chocked (Same as for "stall" test conditions). Measure the line pressure when select lever is in "R", "2" with engine under stall conditions. Measure the line pressure within 5 seconds after shifting the select lever to each position. (If line pressure needs to be measured again, allow the engine to idle, and then stop it to cool down for at least one minute.) Maintain the temperature of ATF at approx. 50°C (122°F) during measurement (ATF will reach the above temperature after idling the engine for approx. 30 minutes with the select lever in "N" or "P".)

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1. Temporarily attach the ST to a suitable place in the driver's compartment, remove the blind plug located in front of the toe board and pass the hose of the ST to engine compartment. ST 498575400 OIL PRESSURE GAUGE ASSY
2. Remove the test plug and install the ST instead. ST 498897200 OIL PRESSURE GAUGE ADAPTER
3. Connect the ST1 with ST2. ST1 498897200 OIL PRESSURE GAUGE ADAPTER ST2 498575400 OIL PRESSURE GAUGE ASSY
4. Check for duty ratio changes by opening and closing the throttle valve using Subaru Select Monitor. Insert the cartridge to Subaru Select Monitor. Refer to «PREPARATION TOOL»(ref-200793-S32902708502005102300000) , General Description. Connect the Subaru Select Monitor to data link connector.
5. Check the line pressure in accordance with the following chart.

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