Tools and Equipment

The DISplus/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.

The correct Universal Adapter for the MS42/MS43 application should be used (#90 88 6 121 300). This will ensure the pin connectors and the harness will not be damaged.

Fig 1: Identifying Tools And Equipment

When installing the Universal Adapter to the ECM (located below the windshield on the passenger side of the engine compartment), make sure the ignition is switched off.

NOTE: NOTE for MS43: Allow at least 3 minutes to elapse after the key was set to the "OFF" position before disconnecting the ECM/TCM. This will allow sufficient time to complete the DM TL test. Voltage may be present (up to 3 minutes) causing damage to the ECM/TCM if they are disconnected during this time period (arcing).

Fig 2: Identifying SKE Breakout Box Set

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.

When testing fuel pressure, the hand held fuel pressure gage (#13 3 060) can be used.

CAUTION: Residual fuel pressure may be present!

The DISplus is equipped with a pressure measuring function, found in Measurement testing. The following adapters (Special Tool numbers) will be necessary:

#13 6 051
#13 6 055
#13 6 057

These adapters install "in line" in the fuel pressure hose.

Fig 3: Checking Fuel Pressure

For vehicles equipped with "quick-release" couplings, install special tool (#13 5 270) between the fuel filter (1) and pressure supply hose (2). This tool will couple to the DISplus Pressure Adapter (3).

Later production fuel rails are equipped with a threaded adapter fitting (1).

This threaded adapter fitting allows Adapter #13 5 220 to be threaded on to the fuel rail and coupled to the DISplus Pressure Adapter.

Fig 4: Identifying Fuel Filter And Pressure Supply Hose

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 bubles are present, this indicates the leaking injector(s).

Fig 5: Fuel Injector Testing Equipment