Ignition System Safety Precautions
WARNING: This page is about a different car, the 2012 Audi Q5, 2011 Audi Q5, 2010 Audi Q5, and 2009 Audi Q5. However, it is still accessible from the selected car via links, so may be relevant.
To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following:
- For safety reasons, if the battery is >>not<< disconnected, the Fuel Pump Control Module -J538- fuse must be removed before opening fuel system. Otherwise, the fuel pump will be activated by the driver door contact switch.
- Individuals with a pacemaker must not stay in the danger area of high voltage systems, for example ignition systems, xenon light.
- Fuel lines must not be opened when engine is running.
- Only disconnect and reconnect wires for injection and ignition system, including test leads, when ignition is switched off.
- If engine is to be cranked at starting RPM without starting (for example, for compression testing), disconnect connectors from ignition coils and remove fuse for electric fuel pump.
- It is possible that the control module will recognize a malfunction and store a Diagnostic Trouble Code (DTC) during some tests. After completing all checks and repairs, check the DTC memory and erase the memory, if necessary.
- Cleaning the engine should only be performed with ignition switched off.
- The Battery must only be disconnected and connected with the ignition switched off, since the Engine Control Module (ECM) can otherwise be damaged.
- Do not touch or remove ignition wires when engine is running or turning at starter speed.
- Always switch ignition off before disconnecting or reconnecting wires for the ignition system, including high voltage wiring and test leads.
- If engine is to be cranked at starting RPM without starting (for example, for compression testing), disconnect connectors from ignition coils and from fuel injectors. After performing work, check and erase DTC memory.
- Cleaning the engine should only be performed with ignition switched off.
Before Opening High Pressure Fuel Injection System
WARNING:
- The injection system is separated into a high-pressure section (maximum approximately 120 bar (1740 psi)) and a low-pressure section (approximately 6 bar (87 psi)).
- Before opening high pressure area, fuel pressure must be reduced to a residual pressure of approximately 6 bar (87 psi). Procedure, refer to FUEL SYSTEM SAFETY PRECAUTIONS - "Before Opening High Pressure Fuel Injection System".