Test Point 8 - Fuel Injectors and Injection Timing

TEST POINT 8

Fuel Injectors and Injection Timing


1. Checking Fuel Injectors

If engine can be run, disconnect plugs on injectors separately.

If injectors are okay, the engine speed will drop each time.

If engine cannot be run, measure voltage on one plug connection of injectors against ground. One of both terminals must have battery voltage; if necessary perform test point 2.

Measure coil resistance on flat male plugs of fuel injector.

Specification: 2 to 3 ohms.

2. Checking Injection Timing

Adjust oscilloscope as described in test point 3.




Connect adapter lead (Bosch "L-Jetronic", No.1684 463 093) between one fuel injector and its matching plug.

Start engine. The following oscillographs will be displayed on the oscilloscope when injection timing is correct.





Refer to test point 10 if injection signal does not switch off while decelerating.