1999 Audi TT Coupe Service and Repair Manual

This 1999 Audi TT Coupe Service and Repair Manual Covers

Engine & Drivetrain

• 1.8L 20-valve turbocharged inline-four engine
• Bosch Motronic ME7 engine management system diagnostics
• Turbocharger inspection and servicing
• Multi-point fuel injection and ignition system repairs
• Engine cooling and lubrication system servicing
• Exhaust and emissions control system repairs
• 5-speed manual transmission servicing (where equipped)
• 6-speed manual transmission servicing (quattro models)
• 5-speed Tiptronic automatic transmission diagnostics and repair (where equipped)
• Front-wheel drive and Haldex Gen I quattro drivetrain servicing
• Haldex coupling diagnostics and servicing (quattro models)
• Front and rear differential servicing
• Driveshaft and axle repairs

Chassis & Suspension

• MacPherson strut front suspension
• Independent rear suspension servicing
• Steering system diagnostics and repair
• Wheel alignment specifications
• Suspension component inspection and replacement
• Wheel bearing servicing

Braking Systems

• Anti-lock Braking System (ABS)
• Electronic Brakeforce Distribution (EBD)
• Brake hydraulic system servicing
• Brake component inspection and replacement
• Hydraulic brake system diagnostics

Electrical & Wiring

• Complete factory wiring diagrams
• CAN Bus diagnostics
• Charging and starting system diagnostics
• Engine Control Module (ECM)
• Instrument cluster diagnostics
• Power distribution, fuse, and relay assignments
• Driver Information System (DIS)
• Audi Concert audio system diagnostics (where equipped)
• Halogen and Xenon headlamp diagnostics (where equipped)
• Exterior and interior lighting diagnostics

Air Conditioning & HVAC

• Automatic climate control diagnostics
• HVAC control module servicing
• Refrigerant recovery and recharge procedures
• Heating and ventilation system repairs

Body & Interior

• Remote central locking diagnostics
• Power window and mirror diagnostics
• Seat adjustment diagnostics (where equipped)
• Interior trim removal and installation
• Exterior body repair procedures
• Airbag (SRS) system diagnostics

Diagnostics & Troubleshooting

• Audi VAS diagnostic procedures
• Diagnostic Trouble Code (DTC) troubleshooting
• Control module adaptations
• Component testing procedures
• Electrical fault tracing
• Service interval reset procedures

Common Error Codes Covered

This manual provides diagnostic and repair procedures for common Audi manufacturer-specific fault codes, including:

Engine Codes

• P0102 – Mass Air Flow Sensor Circuit Low Input
• P0118 – Engine Coolant Temperature Sensor High Input
• P0300 – Random/Multiple Cylinder Misfire
• P0420 – Catalyst System Efficiency Below Threshold (Bank 1)
• P1545 – Throttle Valve Control System Malfunction

Transmission Codes

• P0706 – Transmission Range Sensor Circuit Performance
• P0722 – Output Speed Sensor No Signal
• P0730 – Incorrect Gear Ratio

ABS & Chassis Codes

• C102D – Wheel Speed Sensor Fault
• C1146 – Brake Pressure Sensor Fault
• C1238 – ABS Hydraulic Pump Fault

Network Communication Codes

• U0100 – Lost Communication With Engine Control Module
• U1113 – Function Restriction Due to Communication Fault
• U1121 – Missing Message on Data Bus

Body Control Codes

• B126A – Central Locking System Fault
• B1318 – Battery Voltage Low
• B2000 – Control Module Internal Fault

The manual also includes hundreds of additional Audi-specific diagnostic trouble codes, wiring diagrams, electrical testing procedures, and factory repair instructions.

Who Is This Manual For?

• Audi dealership technicians
• Independent European vehicle repair workshops
• Performance vehicle specialists
• Automotive technicians
• Restoration specialists
• Experienced DIY mechanics

If you are servicing, maintaining, diagnosing, or repairing a 1999 Audi TT Coupe, this factory workshop manual provides the complete procedures and technical information required to perform repairs to Audi factory standards.