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Home >> Mitsubishi >> 1993 >> Mirage L4-1468cc 1.5L SOHC >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Testing and Inspection >> Initial Inspection and Diagnostic Overview

Initial Inspection and Diagnostic Overview

1. TRANSMISSION FLUID LEVEL INSPECTION
- With the vehicle on level surface, start engine and operate at idle speed. With parking brake applied, place selector lever in Neutral, then remove dipstick and check fluid level. Transaxle should be at operating temperature when checking fluid level (120 to 180°F). Fluid level should be between Add and Full lines on dipstick. If necessary, add Dexron II or Diamond ATF SP fluid to bring fluid level within Add and Full lines on dipstick.
2. TRANSMISSION FLUID REPLACEMENT
The automatic transaxle fluid should be changed every 30,000 miles on these units. When refilling transaxle, add only Dexron II or Diamond ATF SP automatic transaxle fluid.
- Raise and support front of vehicle, then position drain pan under transaxle and remove drain located at bottom of differential and allow transaxle to drain.
- Install drain plug, then add 4.2 quarts of the specified automatic transaxle fluid through transaxle dipstick hole.
- Start engine and check fluid level as described under " Fluid Check" in this section.
3. THROTTLE CONTROL CABLE INSPECTION AND ADJUSTMENT





- Check to ensure that the choke lever is away from cam follower.
- Raise the cable cover B upward to expose the cable stopper.





- Check whether the clearance between the stopper and the cover A is the standard value.

Standard value: 0.5-1.5 mm (.02-.06 in.)

If outside the standard value, adjust it by the lower cable bracket.
After adjustment, tighten the lower cable bracket mounting bolt to the specified torque.

Specified torque: 13 Nm (9.4 ft.lbs.)

4. Check to be sure that there is sufficient stroke for the inner cable when the throttle lever is fully open.
5. Lower the cover B until it touches the stopper.








4. PARK/NEUTRAL POSITION SWITCH CONTINUITY CHECK

5. PARK/NEUTRAL POSITION SWITCH AND CONTROL CABLE ADJUSTMENT
- Set the selector lever to the "N" position.





- Loosen the transaxle control cable to manual control lever coupling nut to free the cable and lever.
- Set the manual control lever to the neutral position.





- Loosen the park/neutral position switch body mounting bolts and then turn the park/neutral position switch body so the hole in the end of the manual control lever and the hole (section A-A in the figure on the left) in the flange of the park/neutral position switch body are aligned.
- Tighten the park/neutral position switch body mounting bolts to the specified torque. Be careful at this time that the position of the switch body is not changed.





- Gently pull the transaxle control cable in the direction of the arrow, and then tighten the adjusting nut.
- Check that the selector lever is in the "N" position.
- Check that each range on the transaxle side operates and functions correctly for each position of the selector lever.

6. TORQUE CONVERTER STALL TEST
This test measures the maximum engine speed when the torque converter stalls in "D" and "R" position, and it checks the operation of the torque converter, stator and one-way clutch and the holding performance of the transaxle clutch (including brake).

Caution:
During this test, make sure that no one stands in front of or behind vehicle.

- Check transmission fluid level. Fluid should be at normal operating temperature [70-80°C (158-176°F)]. Engine coolant should also be at normal operating temperature [80-90°C (176-194°F)].
- Apply chocks to both rear wheels.
- Attach engine tachometer.
- Apply parking and service brakes fully.
- Start engine.
- With selector lever in "D" position, depress accelerator pedal fully to read engine maximum r/min.. Do not hold throttle wide open any longer than is necessary to obtain maximum engine r/min.. reading, and never longer than 8 seconds at a time. If more than one stall test is required, operate engine at approximately 1,000 r/min. with selector lever in "N" position to cool transmission fluid between tests.

Stall speed: 1,000-2,200 r/min.

- Place selector lever to "R" position and perform stall test by the same procedure above.

Stall Speed Above Specification in "D"
- If stall speed is higher than specification, rear clutch or overrunning clutch of transaxle is slipping. In this case, perform hydraulic test to locate cause of slippage.

Stall Speed Above Specification in "R"
- If stall speed is higher than specification, front clutch of transaxle or low-reverse brake is slipping. In this case, perform hydraulic test to locate cause of slippage.

Stall Speed Above Specification in "D" and "R"
- If stall speed is lower than specification, insufficient engine output or faulty torque converter is suspected. Check for engine misfiring, ignition timing, valve clearance, etc. If these are good, torque converter is faulty.

NOTE:
This procedure does not fully test the one way clutch inside the torque converter. To complete the test for the one way clutch, drive vehicle at 88 km/h (55 mph) and look for normal engine rpm. If engine r/min.. is abnormally high, a stuck one way clutch is suspected.
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