The service and repair manual for the 1990 Mitsubishi Sigma — the 3.0L V6 engine, 1 trim. Matched to this exact model year, so the specifications and sequences are the ones Mitsubishi published for your car, not figures carried over from a neighbouring year.
01 / FitmentWhat this manual covers
| Model year | 1990 |
|---|---|
| Engines | 3.0L V6 — 181 cu in, SOHC |
| Trims | Base Sedan 4-Door |
| Federal record | 1 recall · 3 complaints · 3 technical service bulletins (refreshed 2026-08-21) |
02 / InsideSample pages from the 1990 Sigma manual
03 / ContentsSections in the manual
- Quick Lookups 67
- General Information 1,418
- Accessories & Equipment 147
- Heating, Ventilation & A/C (HVAC) 143
- Body & Frame 54
- Maintenance 67
- Brakes 125
- Restraints 51
- Drivelines & Axles 19
- Steering 67
- Electrical 112
- Suspension 210
- Engine Mechanical 143
- Transmission 131
- Engine Performance 607
- Tighten bearing to 14
04 / Known issuesRecalls on federal record for the 1990 Sigma
- Seat Belts — front › buckle assembly · 95V103004The safety belts would not provide adequate protection to an occupant in a vehicle crash.
Owners have filed 3 complaints and Mitsubishi has issued 3 technical service bulletins for the 1990 Sigma. The manual carries the manufacturer's diagnostic and repair procedures behind these systems.
FAQQuestions about the 1990 Sigma manual
Is this manual specific to the 1990 Sigma?
Yes. It is the OEM manual matched to the 1990 model year, covering the 3.0L V6 across the Base Sedan 4-Door trims. Specifications and procedure sequences are the ones Mitsubishi published for this year.
What 1990 Sigma problems does it help with?
1 recall is on federal record for the 1990 Sigma, covering seat belts. The manual carries the manufacturer's diagnostic and repair procedures for those systems; the recall repairs themselves are done free by Mitsubishi dealers.
Does it include 1990 Sigma wiring diagrams?
Yes — the complete wiring diagrams for the 1990 build, alongside repair procedures, specifications and diagnostics.
Is it a subscription?
No. $29.99 once and the manual is yours. It is a digital manual — nothing ships; access details arrive by email after checkout and it works on any device.
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