Search found 66 matches

by Valhalla
Thu Oct 02, 2014 10:00 pm
Forum: Automotive kit hardware
Topic: *NEW* : PicoScope 4225 & 4425 Automotive scopes released!
Replies: 13
Views: 54711

Re: *NEW* : PicoScope 4225 & 4425 Automotive scopes released

Mike, This looks very interesting from the perspective of floating grounds. I am trying to get some information about what sort of coupling is, in-fact, in place on the 4425 between the grounds - the website has little extra info on this. My main problem with the 4423 is where I'm looking at ABS sen...
by Valhalla
Wed Dec 04, 2013 10:12 pm
Forum: PicoScope 6 Automotive software
Topic: PicoScope Automotive Top Tips
Replies: 31
Views: 128444

Re: PicoScope Automotive Top Tips

Not sure it comes under "Top Tips", however, a mistake not to make; When 'scoping ABS sensors at the controller, it is tempting to determine which circuit is which by turning each wheel by hand (vehicle suspended in the air), as many manufacturers use common wire colours for each corner of the car. ...
by Valhalla
Wed Nov 06, 2013 12:40 am
Forum: Case studies
Topic: Ford S Max overboost fault
Replies: 6
Views: 17285

Re: Ford S Max overboost fault

It's also important to T the WPS as close to the actuator as possible; many years back I showed how it was possible to get an overboost in vacuum controlled VNT systems (now no longer so popular) under hot environmental conditions through vacuum hose implosion (rubber softens in high underbonnet tem...
by Valhalla
Wed Nov 06, 2013 12:18 am
Forum: Automotive kit hardware
Topic: 4423 scope and a/c power to my laptop?
Replies: 7
Views: 19870

Re: 4423 scope and a/c power to my laptop?

I have to disconnect from mains on both my laptops. Unfortunately, the battery has gone on the second one, so that is a problem at the moment. Main laptop is a Dell E6520, second is a Dell M70. I am going to do an experiment to see if a PC workstation can be put together that does not suffer this pr...
by Valhalla
Sun Oct 13, 2013 10:21 pm
Forum: Diagnostic discussion
Topic: Diesel injection effects on fuel rail pressure sensor
Replies: 11
Views: 25418

Re: Diesel injection effects on fuel rail pressure sensor

Hi Steve, Elsewhere on this forum is a thread for piezo current measurement for injector diagnostics. Now, strictly speaking, this is not quite what you were driving at in your post (I think) because this is trying to use an electrical charge characteristic to measure an electrical failure (piezo st...
by Valhalla
Sat Sep 28, 2013 10:34 pm
Forum: Help me fix my car
Topic: Diagnostic Equipment costs
Replies: 12
Views: 20220

Re: Diagnostic Equipment costs

I have made a few researches on general purpose tools recently, and as stated above, nothing will do it all. The Texa seemed very good, and most people have something good to say about it. I am personally trialling the Autocom CDP+ for both cars and trucks, and I am impressed with it so far. Autel s...
by Valhalla
Thu Jul 25, 2013 11:47 pm
Forum: Diagnostic discussion
Topic: 2008 Vauxhall Vivaro piezo injector currents
Replies: 17
Views: 32868

Re: 2008 Vauxhall Vivaro piezo injector currents

Well, the long story cut short is that the van came back, it transpires it really is an M9R (not F9Q), the other injector at the O/S of the engine bay was also knackered (as per previous multimeter resistance measurements) and that took a week to pull. All work done previously on this van (before I ...
by Valhalla
Wed Jul 10, 2013 10:59 pm
Forum: Case studies
Topic: Jaguar S-Type 2.7D with hesitation at idle
Replies: 14
Views: 31039

Re: Jaguar S-Type 2.7D with hesitation at idle

I had a look at a '57 Toyota Avensis D-4D today, just a routine first-service and check over for a local chap that has just acquired it. Unfortunately for me, time did not permit me to measure the rail pulsations in the same way as FF, but now I fully appreciate the points that you were trying to ma...
by Valhalla
Tue Jul 09, 2013 11:40 pm
Forum: Case studies
Topic: Jaguar S-Type 2.7D with hesitation at idle
Replies: 14
Views: 31039

Re: Jaguar S-Type 2.7D with hesitation at idle

Is the 2.7 TDV6 a Denso 2-piston HP pump then? :wink:
by Valhalla
Mon Jul 08, 2013 11:18 pm
Forum: Case studies
Topic: Jaguar S-Type 2.7D with hesitation at idle
Replies: 14
Views: 31039

Re: Jaguar S-Type 2.7D with hesitation at idle

The main wave we can see in this image is a combination of two harmonics: one with a frequency of one per engine's revolution (blue), and the other at the frequency of injection (green). About the main harmonic (blue) we must know the type of pump because if it is a pump with one or two elements as...