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- เผยแพร่เมื่อ 7 ก.ค. 2024
- In this video, senior Delphi Technologies trainer Dave Hobbs introduces a new type of fuel pump you may have encountered in vehicles made after 2011: 3-phase brushless DC fuel pumps. They're gaining popularity, but they're a little different than the fuel pumps you may be used to. We'll show you how they work and how to diagnose them correctly. The best place to test is at the fuel pump control module, where you'll see three wires instead of the usual two. Your best bet is to use a four-channel lab scope to help with your diagnosis.
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Great instruction, change is the technician’s Constant
Good information Dave. One to look out for. 👍
Very good information, regards from Iceland :)
It’s not a Toyota, but I’m troubleshooting a crank no start Audi at home, and this is good info for me. I don’t have a scope, but I do have a Fluke and scan tool. I think I can use the info from this video to help me figure out if the controller and high pressure fuel pump are working. Thank you for the video.
Thank you
thank you for the video
Thanks Dave Hobbs for share this information about fuel pump. I met some problem with Volkswagen Touareg with two pump one start and one main.
I’ve got a 2014 vw Touareg 3.0 v6 tdi in non start and it’s got the 3 phase pump and on the left hand side another pump. What was your diagnosis with your Touareg
Super interesting
Finally Toyota decided to join the Fuel Pump Driver bus. Their fuel pump control circuitry has been in the Middle Ages for so long. And now they're doing 3 phase fuel pump motors. Wow!
What would the signals looks like if the pump was unplugged? Would the PWM still remain the same but there would be no amperage draw?
Hi, I’m testing a 2019 es350 with an identical pin out as shown in this video. With KOEO, I have 12 volts at all 3 phase wires, just like you demonstrated. The thing that’s puzzling me is that I have 8 volts at the brown wire. I don’t know much about shielded grounds. Would the 8 volts at the brown wire suggest high resistance in the ground? Thank you
Hi dear sir... many thanks for this great explaining. I need to know the min. and max. AC voltage on u & v or v & w phases during brushless fuel pump working. Many thanks as advanced.
interesting but what if the pulse width ecm signal was missing? what inputs does the ecm need to generate the pwm signal to the pump control unit?
i have the VW and BMW 3 phase BLDC fuel pump voltage pattern, it is some kind of PWM. is it different to your instructed pump control, thanks.
I am curious if you are able to measure pump speed on these with the pico, or is that not possible?
I reckon you might be able to by working out the frequency between the phases, then a calculation to get the rpm. One complete phase would be 360 deg of pump rotation, work out the time for the one phase, then divide in to 60 seconds for rpm. I think you would only need one phase waveform to work this out. Not done this before, so consider this 'in theory'! There might be an easier way?
An easy way would be to concentrate on just one phase: knowing that each coil changes polarity every other activation the time between 2 positive ore 2 negative activations equals to a complete turn of the pump. You can measure this with just one channel with just one amp clamp, no 3 or 4 channels required. Same applies for voltage measurement. From there on you'd math it out the usual way.
Can you use a two channel?
What would happen if you lost one of the phases.
Depends what the control logic decides. A 3 phase motor can run in 2 phases if it was still running before fault occured. But with current increase on the remaining two phases.
Great question Rey! I need to verify this but it should not run. Using the Toyota Tech Stream scan tool you can activate a single phase (one at a time) and it does not run. I would presume that dropping a single phase would be similar - the pump wouldn't run.
It doesn't run - I used to put this fault on Audi's during technical training 👍. Each phase acts as a 'supply' and 'ground' for the other phases when in operation. If one phase is open, essentially all three phases are open.
@@MechanicMindset Incorrect, if one phase is open, if control logic permits, the other two phases can still be produced from a dc rail supply. Maybe not done in automotive, but it is possible.
@@liviu2004 never under load.
Too much time spent using a DVOM that doesn’t work. Good & bad patterns would have better suited the videos title.
exactly what I was thinkin'
Delphy fuel pump Sr instructor should show how to test failed pumps and failed controllers.
What is the new design life, 100kMi??