BMW L-JET JETRONIC D-JET EFI FUEL INJECTOR INJECTION TESTER M20 M30 E9 E12 E23

Description

This is a test light for troubleshooting Bosch L-Jetronic fuel injection as well as D-Jetronic. D-Jet requires a slight modification to the tool. Vehicles get modified over the years so be sure of what you have. This won't work on K-Jetronic.
This small tester is designed to help you identify the source of rough idling, stumbling, missing, etc. without expensive tools or paying a shop for the labor just to narrow down the problem. You can easily
narrow down the problem yourself by using the signals from this test light to simply rule out other components.
The only instructions provided are below:
1. Disconnect the harness at one injector and insert the light's two metal prongs into the end of the harness.
2. Start the car. Your EFI is now firing the test light. The engine will of course miss but the focus here is the condition of the signals going to the light.
3. If the light strobes steadily and consistently then that particular injector lead is receiving a good signal. The next suspect component is the injector itself. Try swapping it out for a known good injector.
4. If the light flashes erratically, lights up solid, or doesn't light at all then the signal through that particular injector's harness is a problem or the EFI control unit itself is failing to send the proper signal.
4a. Check each wire in the injector wiring lead for continuity end to end. Move the harness around to see if the light pattern changes. If so then it would indicate a broken, shorted or poor connection at the injector or at the pins on the EFI control unit. Check for weak/loose pins and add a dielectric silicone to each pin/socket individually before reattaching the harness.
5. If you have confirmed wiring harness and connector integrity and a known good injector does not address the issue then the EFI control unit is the final suspect. Note that the various sensors in the system would not affect a single cylinder. A bad sensor would affect the entire system uniformly.
***Tool modification required for D-Jet. The difference between the L-Jet connector and the D-Jet connector is the shape of the pins. This tool has round pins and will fit the D-Jet connector if you file the pins flat.
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