Preliminary Check
WARNING: This page does not describe the selected car, but rather 37 other vehicles, including the 2005 BMW 760i, 2004 BMW 760Li, 2003 BMW Z8, 2003 BMW Z4, and 2003 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
- Injectors should be tested using DISplus/GT1 for resistance, power supply, status display-fuel injection signal, and ECM final stage transistor activation. These test functions are found under the oscilloscope preset list. Install universal adapter, diagnostic cable, negative lead to ECM ground and positive lead to the ground activation circuit for the injector. This test is performed with the engine cranking or running.
- Fuel supply hardware should be visually inspected for damage that can affect pick-up, transfer, pressure and return. The fuel tank must be drained first before removing the service access cap to perform any repair. The fuel filter, fuel pressure regulator, electric fuel pump, right fuel level sensor and siphon jet are accessed through the service access cap. Remove the single 6-pin electrical connector (2 pins for the fuel pump, 2 for each level sensor-left/right). Remove the fuel supply line by releasing the quick release coupling. Fuel tank is secured by 2 straps to the body.