Trying to get my Nissan 200sx to get started with VEMS after it went dead.
Warning: jap coils are mostly low dwell !!! Much chance for danger if you neglect this
Motor:
CA18DET
CYLINDER: 4
Head: 16 valve
Trigger: 24/1 CAS
FW: 1.1.50
Map sensor internal: 400Kpa
Connected with Vems loom v3
- Config: http://www.vems.hu/files/MembersPage/MaxLarsson/config/config.txt
- Tables: http://www.vems.hu/files/MembersPage/MaxLarsson/config/tables.txt
Update 2009-07-23
I got the box back from repair, all sensors now working.
Having a big problem. When I rev the engine to 3000rpm the box locks up
- notebook lose connection with the box.
- injectors stay open
- fuel pump is running continuously
We've seen this before. The problem was, and in this case also, most certainly misconfigured too high dwell (together high slope in function of MAP). The extreme currents lock up the box. Especially with jap coils, that need even lower dwell. Configure 2-2.5 msec dwell with zero slope..
With poor grounding or flyback this can be a problem at otherwise normal dwell values. But even with good grounding, you will see this at too long dwell. (the mean current is roughly proportional with the second power of dwell, but peaks can be bad anyway). With our coils this lockup happened around 4.5msec dwell, but with jap coils it can much lower, maybe at 3 msec (somewhat depends on wiring).
This is resulting in a floaded engine if I dont switch the power off.
I had this problem before i mangade to kill the box buy running 12v in to the EC18 16, 17.
Can a faulty/messy trigger signal make this symptom? Or is this a grounding issue?
HISTORY(will clean up later)
Update 2009-07-14
What happens to the box if i get 12V supply through EC18 pin 16 and 17. This is what happened.
- at least the [MCP3208] gets killed'. In some cases it can cause worse damage too.
In frustration when the car stoped reacting as it shuld I relocated the Coil wirings from EC36 33 34 35 36 to EC18.
But I must have counted wrong. I missed placed two coil connectors to EC18 nr 16 17 so the box probably got killed buy this. Is this a likely explenation?
yes
. .The problem:
I'm having trouble geting the sensors to work. I have some kind of earthing problem that im trying to fix.
Grounding problem can be one cause.
(The grounding is throug the vems v3 harness. The ground point is at the chassie frame, the connection surface is clean metall with a M8 bolt securingit to place.
I have tested my vems box in a friends car but the same error accured. Removed the P259 circuit but didnt help.
The box is answering ("Hello") when using "Terminal v1.9b".
The main problem now is that my sensor don't give a reading.
TPS=100%
CLT= -40
IAT= -40
Map=405Kpa (internal)is it an internal MAP sensor or an external sensor ???
These mean that the microcontroller sees 5V for each. Something in the install is seriously broken. What is the voltage measured on these inputs (with EC36pin26 as base) ?
RPM meter is working.
Ignition is dead.
Have tried bothe the EC36 33 34 35 36 outputs for the ignitions and the Ec18 Stepperoutput but theres no reaction of life.
When you are trying the outputs with bad grounding you risk (further?) damage.
The coils are working when manualy grouning them fast.
The injectors dosn't work.
Theres 12V to the injectors, CAS and ignition.
I mesured the outputs with DVM.
P259ch0=16v
5v+ 4.96
tps supply 4.96
primary trigger 4.3v
sec trigger 4.78v
Loaded the new 1.1.50 fw on to the vems box but didn't help.
I think somethings dead in the box. Don't know what to do.
I have tried FW 1.1.18 and 1.1.44Alpha2 but same error.
The box did work with fw 1.1.18 and 1.1.44Alpha before it stopped reacting when I was driving.