Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMITSUBISHI1989SIGMA AUTOMATICREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - KM175, KM176 & KM177TESTINGROAD TEST
1989 Mitsubishi Sigma Automatic
Road Test
1989 Mitsubishi Sigma AutomaticSECTION Road Test
- Before road testing vehicle, ensure transaxle fluid level, fluid condition and shift cable adjustments have been checked and corrected (as necessary).
- Road test vehicle and check for abnormal noise and clutch slippage. Specified clutch and brake are applied in designated gear. See CLUTCH & BRAKE APPLICATION .
- Ensure upshift and downshift speeds are correct in relation to throttle opening, vehicle speed and position of range switch and overdrive switch. See Fig 1 -Fig 2 . Range switch is located on console, near shift lever. Overdrive switch is mounted on shift lever.
- Various test procedures given can be used to detect any slipping component and confirm proper operation of good components. Malfunction may be caused by leaking hydraulic circuits or sticking valves.
- More testing is needed if the actual cause of a malfunction cannot be easily determined. Unless an obvious malfunction exists, DO NOT disassemble transaxle until hydraulic pressure tests have been performed.
CLUTCH & BRAKE APPLICATION
| Shift Lever Position | (1) Elements In Use | |||
|---|---|---|---|---|
| "D" (Drive) | ||||
| 1st Gear | Overrunning Clutch & Rear Clutch | |||
| 2nd Gear | Kickdown Brake & Rear Clutch | |||
| 3rd Gear | End Clutch, Front Clutch & Rear Clutch | |||
| 4th Gear | End Clutch & Kickdown Brake | |||
| "2" (2nd Gear) | ||||
| 1st Gear | Overrunning Clutch & Rear Clutch | |||
| 2nd Gear | Kickdown Brake & Rear Clutch | |||
| "L" (Low) 1st Gear | Low-Reverse Brake & Rear Clutch | |||
| "R" (Reverse) | Front Clutch & Low-Reverse Brake | |||
| "N" (Neutral) | All Clutches & Brakes Released Or Ineffective | |||
| "P" (Park) | All Clutches & Brakes Released Or Ineffective | |||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.