Component Tests and General Diagnostics

Fig. 3 Fuel injector specifications:

1. Remove fuel distribution rail and injectors , then reassemble injectors onto distribution rail.
2. Suspend injector assembly above suitable containers to catch and measure fuel and observe spray patterns. Connect fuel supply and return lines using suitable extensions, and place in a stable location.
3. Remove fuel pump relay and connect battery voltage to terminal 87 in pump relay socket to activate fuel pump.
4. Inspect injectors. Injectors should not leak more than 1 drop of fuel per minute with fuel pressure of 2.5 bar (36 psi).
5. Connect jumper wires to each injector using suitable adapters.
6. Place graduated cylinder under injector to be tested, energize injector for 1 minute by connecting jumper wires to battery and observe spray pattern and discharge rate. The fuel mist from the injector is highly flammable, and potentially explosive. Care must be taken not to produce sparks near open container of fuel when energizing and de-energizing injectors.
7. Injectors should spray fuel in an even, conical 30 degree pattern, and each injector should deliver the amount of fuel shown in Fig. 3. Injector code number is stamped on injector body adjacent to electrical connector.
8. Disconnect jumper wires from injectors and fuel pump relay terminal.
9. Check resistance of injector solenoid coils using suitable ohmmeter. Resistance should be as shown in Fig. 3.
10. Any injectors that fail to perform as specified should be replaced.