Motronic Fuel Injection System

For Ignition system servicing
See 'Ignition System.' [1][2]Ignition System


NOTES:
- Engine compartment fuel lines must be secured with spring clips. The use of clamp or screw-type clips is not permitted.
- The Engine Control Module (ECM) for the Fuel injection and Ignition system is equipped with a Diagnostic Trouble Code (DTC) memory Before performing repairs, adjustments or troubleshooting, the DTC memory must be checked and the vacuum connections checked for leakage (outside air).
- Components tagged with an * are checked via On Board Diagnostic.
- Components tagged are checked via Output Diagnostic Test Mode (DTM).
- Trouble-free electrical component operation requires 11.5 Volts (minimum).
- Do not use sealants containing silicone. Particles of silicone drawn into the engine, are not consumed during combustion and could damage the Oxygen sensor resulting in higher exhaust emission levels.
- Do not use terminal sprays or similar materials in the area of the Oxygen sensor connector. Oxygen sensors require reference air to function correctly which they receive via the cable. If terminal spray enters the sensor via the cable, it can lead to possible damage or drive ability complaints.
- As a result of performing certain checks, the ECM can trigger and and store a DTC. Therefore after completing all checks and repairs, DTC memory must be checked for any possible DTC's and if necessary erased.
See 'Function 05," DTC Memory - Erasing".' With Manufacturer's Scan Tool (VAG)

Safety precautions
See 'Fuel Delivery and Air Induction.' Service Precautions

Rules of cleanliness
See 'Fuel Delivery and Air Induction, Vehicle Damage Warnings.' [1][2]Technician Safety Information

Technical data
See 'Specifications' under the component being diagnosed.