Diagnosis Introduction - Except Evolution: Other Mitsubishi Lancer IX

FAIL-SAFE/BACKUP FUNCTION

When a malfunction of a main sensor or actuator is detected by the PCM, the transaxle is controlled by preset control logic to maintain safe conditions for driving.

The following table shows how the fail-safe/backup function affects vehicle driveability and operation.

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HYDRAULIC PRESSURE TESTS

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1. Check the A/T fluid level and temperature. Check engine coolant temperature. A/T fluid level: "HOT" mark on the dipstick A/T fluid temperature: 70 - 80°C (158 - 176°F) Engine coolant temperature: 80 - 100°C (176 - 212°F)
2. Raise the vehicle so that the wheels are free to turn.
3. Connect the special tools (3.0 MPa (427 psi) oil pressure gauge [MD998330] and adapters [MD998332, MD998900]) to each pressure discharge port. NOTE: 2ND: Second brake pressure port UD: Underdrive clutch pressure port LR: Low-reverse brake pressure port DR: Torque converter release pressure port DA: Torque converter apply pressure port ("DA" pressure is approximately the same as the "DR" pressure, so measurements are not needed) RV: Reverse clutch pressure port OD: Overdrive clutch pressure port
4. Restart the engine.
5. Check that there are no leaks around the special tool port adapters.
6. Measure the hydraulic pressure at each port under the conditions given in the standard hydraulic pressure table, and check that the measured values are within the standard value ranges.
7. If the pressure is not within the standard value, stop the engine and refer to the hydraulic pressure test diagnosis table.
8. Remove the O-ring from the port plug and replace it.
9. Remove the special tool, and install the plugs to the hydraulic pressure ports.
10. Start the engine and check that there are no leaks around the plugs.

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Note. When the torque converter pressure is measured, the engine speed should be 1,500 r/min or less.

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1. Drain the A/T fluid. NOTE: The hydraulic pressure test must be performed before attempting any adjustments.
2. Remove the valve body cover.
3. Turn the adjusting screw shown in the illustration to adjust the line pressure to the standard value. The pressure increases when the screw is turned counterclockwise. NOTE: When adjusting the line pressure, adjust to the middle of the standard value range. Standard value: 1.01 - 1.05 MPa (147 - 152 psi)
4. Install the valve body cover. Pour in one quart A/T fluid.
5. Repeat the hydraulic pressure test. (Refer to «TORQUE CONVERTER STALL TEST JUDGMENT RESULTS»(ref-183627-S22974071342005081800000) .) Readjust the line pressure if necessary.

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Note. The PCM connectors should be disconnected for this inspection.

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