April 5, 2026: LEMON Manuals is launched! Read the announcement.

Tools And Equipment

The DIS/MoDIC as well as a reputable hand held multimeter can be used when testing inputs/components.

It is best to make the checks at the ECM connection, this method includes testing the wiring harness.

Fig 1: Identifying DIS/MODIC And Reputable Hand Held Multimeter

G03394707

Courtesy of BMW OF NORTH AMERICA, INC.

The correct Universal Adapter for the MS S54 application should be used (#90 88 6 121 300). This will ensure the pin connectors and the harness will not be damaged.

When installing the Universal Adapter to the ECM (located in the Electronics Box in the engine compartment), make sure the ignition is switched off.

Fig 2: Identifying SKE Breakout Box Set

G03394708

Courtesy of BMW OF NORTH AMERICA, INC.

The Fuel Hose Clamp Tool (#13 3 010) can be used for isolating pressure faults. In addition, fuel loss can be reduced when changing the fuel filter while loosening clamps (1 and 2).

The Relay Bypass Switch (#61 3 050) must be used especially when fuel vapors are present! The switch eliminates the risk of electrical arcing.

Fig 3: Checking Fuel Filter

G03394709

Courtesy of BMW OF NORTH AMERICA, INC.

When testing fuel pressure, the DIS is equipped with a pressure measuring function, found in Measurement testing can be used.

A threaded fitting provides a test point at the fuel pressure regulator. This threaded adapter fitting allows Adapter #13 5 220 to be coupled to the DIS Pressure Adapter.

CAUTION: Residual fuel pressure may be present.

Fig 4: Testing Fuel Pressure

G03394710

Courtesy of BMW OF NORTH AMERICA, INC.

When testing the fuel injectors for leakage, use Special Tool #88 88 5 000 362.

This tool pressurizes the injectors with air and the injector tips are submersed in water. If air bubbles are present, this indicates the leaking injector(s).

Fig 5: Special Tools For Checking Fuel Injectors For Leakage

G03394711

Courtesy of BMW OF NORTH AMERICA, INC.