Buzz Tool

Today’s Common Rail injector coils typically have low resistance and cannot be measured using a standard digital multimeter (DMM). In fact, it’s simply not enough to measure resistance to determine a coil’s health; technicians need to measure inductance for an immediate and accurate assessment. Until now, separate tools including a DMM, Megohmmeter, Millohmeter, LCR meter and signal generator would be needed for this. But not any longer!

Delphi’s Electronic Injector Kit combines all of this into a single, economical and easy to use hand-held tool by measuring resistance and inductance of the coil in the injector, checking for coil open/short circuit and the insulation of the coil to the injector body and driving the valve to make it BUZZ, proving the valve is not stuck from lacquering deposits. This diagnosis can ensure significant time and cost savings for the garage.

The kit is designed to be used on or off vehicle and offers two cycles:

• In measurement, it performs important test measurements on the valve. By running this cycle, any injector electrical failures are quickly detected.
• In cleaning, the injector BUZZ assists cleaning of the lacquering of internal components (valve) of the injector, without removing it from the vehicle.

Step 1

Select the correct adaptor cable from the complete range supplied with the kit. Connect one end to the test unit. Note the YDT720 kit is not compatible with direct or indirect operation piezo-electric injectors.

Step 2

Connect the green crocodile clip to the green banana connector on the test cable, then clip to the injector body, or another solidly secured component (HP pipe, engine block etc.). This is to ensure the insulation test function is carried out during the test cycle.

Step 3

Connect the supply cable connectors to the vehicle battery. Red to the battery +ve and black to the –ve/0V). The battery must be in good condition and supplying a 15 to 25a current.

Not Just Brakes. Delphi Brakes

Power up! Once connected to the injector, press the button to start the electronic test. The unit will then:

• Detect the presence of an injector
• Test for a coil open circuit
• Test for a coil internal short circuit
• Check the coil insulation to the injector body

If any of the above faults are detected, the tool will clearly display the fault found and will not progress to the measurement stage. If not, it will measure and display:

• Coil resistance
• Coil inductance

Compare each injector to the other injector results and look for any noticeable differences, which are an indication of failure. Check the back of the users’ manual for a record sheet to record these values.

Step 5

Following the measurement, press continue and carry out the BUZZ test. During the control sequence, the test injector will make a characteristic audible buzzing noise, which is an indication that the injector valve has free movement and is not suffering from lacquering.

Repeat the above steps for each injector on the vehicle being tested.

* While the Electronic Injector Test Kit is designed to be used as a stand-alone product for electronic diagnostics of Common Rail solenoid injectors, to carry out the injector cleaning operation it must be used in conjunction with our Solvent Cleaner Kit.