How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: Jaguar
Satisfied Customers: 22819
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
Type Your Jaguar Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

Can't get voltage to injectors. is there a special meter to

Customer Question

Can't get voltage to injectors. is there a special meter to check voltage i.e. is it measured in milivolts? I noticed the vacuum reservoir tank located in the left front wheelwell is missing. Does the ECU need vacuum to initiate startup and the ECU be checked? I currently have it out of vehicle.
Submitted: 1 year ago.
Category: Jaguar
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

The injectors will only have power when the engine is cranking. the ECM supplies them with ground and they are controlled with a high side driver.

The best way to check for injector pulse is with an incandescent test light on the driver wire with the alligator clip connected to chassis ground. With the engine cranking the test light should flash. Have you checked this way?