1990 Saab 900 Base, 2D Convertible, AutomaticFACTORY OEM SERVICE PROCEDURE

Repair and Diagnosis

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Tests W/Codes Engine Controls - Tests W/O Codes Testing & Diagnosis EGR Function Testing Engine Controls - Basic Testing Engine Controls - System/Component Tests Engine Controls - Tests W/Codes Engine Controls - Tests W/O Codes Theory and Operation Engine Controls - Theory & Operation Vacuum Diagrams Wiring Diagrams General Information Abbreviations Commonly Used Abbreviations - General Information Emission Control Abbreviations Basic Trouble Shooting Basic Trouble Shooting - General Information Commonly Used Abbreviations - General Information Emission Control Abbreviations Engine Performance - Trouble Shooting - General Information Brakes Anti-Lock Brake Safety Precautions - General Information Map - Brake Systems Map - Routine Inspection Reference Guide Check Lists Symptom Check List Worksheet - General Information Computer Relearn Procedures Driveline/Axles Drive Axle Noise Diagnosis - General Information Gear Tooth Contact Patterns - General Information Map - Drive Train & Transmission Trouble Shooting - Clutches - General Information Electrical Map - Electrical Systems Using lemon2025'S System Wiring Diagrams Engine Engine Overhaul Procedures - General Information General Cooling System Service - General Information Engine Performance Electrostatic Discharge Warning - General Information Engine Performance Diagnostic Routine Outline - General Information Engine Performance Safety Precautions Map - Engine Performance & Maintenance Parasitic Load Explanation & Test Procedures - General Information State Emission Standards - Diesel State Emission Standards - Gas Waveforms - Injector Pattern Tutorial - General Information Map - Exhaust Systems Heating, Ventilation & A/C (HVAC) Map - Heating, Ventilation, & Air Conditioning Identification CANADIAN Model Cross-Reference Metric Conversions Engine Displacement Conversion Table - ECAT Metric Conversions OEM General Information How To Use The Engine Performance Section Maintenance Reminder Light (Reset Procedures) Restraints Air Bag/SRS Component Inspection & Replacement Tables - EUROPEAN Steering Map - Steering, Suspension, Wheel Alignment, Wheels & Tires Wheel Alignment Theory & Operation - General Information Traction Control Disable Procedures Trouble Shooting - Manual Transmission - General Information Heating, Ventilation & A/C (HVAC) General Servicing A/C Compressor Oil Checking A/C System General Diagnostic Procedures A/C System Precautions Cabin Air Filter HVAC Control Systems A/C-Heater System - Manual Maintenance Procedures Maintenance Information Maintenance Reminder Light (Reset Procedures) Service Indicator & Warning Lights Restraints Air Bag, SRS Air Bag Restraint System Air Bag/SRS Component Inspection & Replacement Tables - EUROPEAN Post-Collision Air Bag Safety Inspection Steering Manual Steering Steering System - Power Power Steering Steering System - Power Steering Column Suspension Front Suspension Rear Suspension Wheel Alignment Pre-Alignment Checks Specifications & Procedures Transmission Automatic Trans Overhaul - Borg-WARNER Model 37 Removal & Installation - A/T Servicing - A/T Clutches Manual Trans Overhaul - Gm Series 5-Speed Servicing - M/T

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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