OHM's LAW 
 
1. What can be diagnosed with the CRT Current Probe?
Fuel Pumps, Fuel Injection Systems (both TBI and Ported systems), Distributorless Ignition Systems, Standard Ignition Systems, DC Motors of all types, Windows, Wipers, Fan Blowers, Headlamp Doors, Cooling Fans, Door Locks, Idle Speed Control, Idle Air Control, etc., Parasitic Drains, Charging Systems, Electrical Shorts, Solenoids and Relays, Electronically Controlled Transmissions, Antilock Brake Systems, Lighting Systems, Cruise Control Systems and Accessories, to name a few.
2. How do I get my scope to display a fuel pump waveform?
Simply connect the CRT Current Probe around the fuel  pump feed circuit. Good and Bad Fuel Pump
3. How do I make the CRT Current Probe show me a DIS pattern?
Hook the CRT Current Probe around the ignition feed circuit to the coil and connect to your scope. DIS pattern
4. What does a shorted fuel injector look like with the CRT Current Probe?
Shorted PFI injector 
Shorted Bank fired injector 
5. I have a fuel pump image but I don't know what it is telling me. Can you help?
Read the fuel pump articles linked below
6. Can you find a short with the CRT Current Probe?
Yes. Simply connect the CRT Current Probe around the circuit with the short. Install a breaker in place of the blown fuse. Move the CRT Current Probe along the circuit checking for a current spike each time the breaker kicks in until you find the short.
7. Why does my current waveform not touch the ground signal?
The CRT Current Probe needs to be zeroed before you test a circuit.
Check out these links: 
ASA Automotive Service Association
IATN International Automotive Technician's Network
Autoinc Magazine Articles about  Current Probe Usage
Scope Triggering Technique
A "Short" Story
Current Probing the depths of Cadillac Fuel Injection sept 99
The Sea Gull Effect july99
Keeping Up with Current Probe Technology may 99
Gauges Going Haywire! march 99
Learning to Trust the Current Probe jan 99
The Fox and the Hounding Driveability Problem
Harold's Fuel Pump Story
Probing a misdiagnosed no-start-cold
Diagnosing Electric Fuel Pumps Using a Current Probe

Contact us at: J&A Auto Electric
390 South Riverside Drive
Batavia, Ohio 45103

Phone: 513-732-3965 or 513-735-5622
Fax:     513-732-3965
Email: jnabach@fuse.net

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