Car Wont Start - PIM, VTA1 & VTA2 All highlighted on PFC

ttpower · May 16, 2014, 05:02:04 PM

Was just driving along went over a speed bump(very slowly) and my car just died. Now on the PFC in the sensors section; PIM, VTA1 & VTA2 is highlighted with 0.01v!!
I tried adjusting the MAP sensor but the values don\'t change, only when I unplug it completely the voltage goes to 4.48ish.
Any ideas what could be the problem?

boosted · May 16, 2014, 07:13:26 PM

Id been checking ecu and harness plugs mate.

ttpower · May 16, 2014, 10:22:42 PM

Checked them visually and they seem to be ok. Will have another look tomorrow.

boosted · May 16, 2014, 11:23:36 PM

If there all seated...fuses....then earths. Fd elec drawings on here somewhere worth a look.
fingers x summit simple.

ttpower · May 17, 2014, 06:50:33 AM

Which earth is used for the +5v for the map & tps sensor. Is it the one which bolts to the intake manifold?

boosted · May 17, 2014, 10:01:25 AM

Time to find the drawings mate...there on the net somewhere ( prob rx7 club)

Need the pin outs on the ecu for the 5v pos. check this ok and work through drawings.
As these car are getting old could be a fractured wire in the loom i use a safety pin poke through the insulation onto the wire inside to check for power. Ackward but works.

If youve got 5 v on the pin out then wiring...if not then ecu....have you got your standard ecu to try?

A guy was having a similiar prob on a rewire a couple of weeks ago and the earth is at the ecu pin...so need to check this also.

Drawings time me thinks.

ttpower · May 17, 2014, 05:05:32 PM

Ok so checked the ecu, turns out my power fc is not giving out the 5v for the tps sensor. I also found a bad ground caused by the window wiper motor. Was actually making the ground point hot!

Anyway, I put a 5v source on the tps output and sensor reading fine, this mean my ecu is fried!

Which pin is the earth for the tps?

boosted · May 17, 2014, 06:18:33 PM

http://www.mazdarotaryclub.com/forums/showthread.php?t=81626

pin 4d...drawings here.

ttpower · May 17, 2014, 08:44:07 PM

Ok ground is good, multimeter showed continuity between the br/b wire off the tps sensor and chassis. Any other ideas,
when I run a 5v source to pin 3i the pim shows highlighted 4.99v and tps voltage is fine. Shouldn\'t the map sensor voltage be ok, can\'t think why it would still be reading wrong.

ttpower · May 17, 2014, 08:45:36 PM

Looking at the wiring diagram it seems the map & tps sensors share the same 5v(ecu pin 3i) & ground at ecu pin 4d.

boosted · May 17, 2014, 08:58:16 PM

yes from 3I...but x05 is a connector...can you check this?

boosted · May 17, 2014, 09:16:42 PM

Hi mate absolutely shed loads of info on the rx7club website. how to check a map sensor diagrams etc. Not wishing to send you away from here but fixing your 7 priority.

ttpower · May 17, 2014, 10:01:56 PM

Hi mate checked 3i, no 5v coming out of ecu. Also checked for continuity for this wire and it\'s fine.
Browsed all over Inc posting on the rx7 club website too. Reading from one post, a guy with a similar prob figured it to be a resistor problem in the power fc that blown due to a short on the ground.
I had a short from the window wiper that was making the ground source very hot and that shared with the everything ( 5no ground connectors at slam panel). Maybe it\'s fried!

boosted · May 17, 2014, 10:13:12 PM

Not good bud! Hoping the map was duff and taking the 5v down! Have you got the standard ecu still at least get it up and running?

boosted · May 17, 2014, 10:15:20 PM

Maybe send for repair? dont know who though....circa Â£450 2nd hand eek!