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Information on my wiring setup
Tachometer (RPM Rev Counter)
Original setup
Originally the rpm signal is feed from the coil (-) (Single coil distributor) to the fuse box where the signal is distributed to the fuel pump relay, multi function instrument (shift light for economic driving, fuel consumption calculations) and tachometer.
New setup:
I'm now using 4 COPS and need a new tachometer signal and rpm signal to the fuel pump relay.
A possible solution is to wire signal from each coil with separation diodes into the cars original wiring
Using 4 high-voltage diodes (such as ES2J or BY399 or even 1n4007) to make a tach signal compatible with the original sounds good.
A similar solution is described at the bottom of this page http://www.megasquirt.info/ms2/EDIS.htm
Questions from others:
Why don't you control the shift light and fuel pump relay directly from the ECM ? To keep it simple I prefer to use a well known solution at the moment (and it's simple to wire in one cable)
Pin-out
work in progress
| VEMS Pin-Out | Function | Wiring Colour | Car Pin-Out | Comments |
| EC36-1 | TPS signal | ws/ge 0.35mmý | Pin 5 TB | |
| EC36-2 | Intake Air Temp | sw/ro 0.35mmý | PIN 1 IAT | Pin 2 (Ref Gnd - EC36-26) |
| EC36-3 | Fast Idle solenoid | NA | ||
| EC36-4 | Coil #8 | NA | ||
| EC36-5 | Analog Ground | - | - | Ground on the top of the cylinder head |
| EC36-6 | Injector G | NA | ||
| EC36-7 | Injector A | Pin 2 | Injector Cyl 1 | |
| EC36-8 | Injector C | Pin 2 | Injector Cyl 3 | |
| EC36-9 | Injector E | NA | ||
| EC36-10 | Coil #7 | NA | ||
| EC36-11 | Coil #4 | NA | ||
| EC36-12 | Coil #5 | NA | ||
| EC36-13 | Secondary Trigger | Pin 2 (signal) | G40 Hall Cam shaft sensor Pin 1(+5V), Pin 3 (Ref Gnd - EC36-26) | |
| EC36-14 | Coolant Temp | Pin 1 (Signal) | G62 Coolent sensor , Pin 3 ( Ref. Gnd - EC36-26) | |
| EC36-15 | Fuel Pump | Relay (29) | Relay signal to pin 29 | |
| EC36-16 | Coil #9 | NA | ||
| EC36-17 | Injector H | NA | ||
| EC36-18 | Injector F | NA | ||
| EC36-19 | Injector B | Pin 2 | Injector Cyl 2 | |
| EC36-20 | Injector D | Pin 2 | Injector Cyl 4 | |
| EC36-21 | Analog Ground | - | - | Ground on the top of the cylinder head |
| EC36-22 | Flyback Rail | NA | Not used - Use EC36-23 | |
| EC36-23 | Flyback Rail | - | Solder Internal lead - Ground to engine or batt. | |
| EC36-24 | Coil #6 | NA | ||
| EC36-25 | Vbatt (Switched with ignition - hot in start and on positions) | - | "Fuse box rail ""30""" | |
| EC36-26 | Signal Ground | Ref. Gnd for TPS, IAT, CLT,CAS... Connect all in wiring Ground to engine or batt. | ||
| EC36-27 | Primary Trigger | Pin 2 (signal) | VR sensor G28 - Pin 1( Sensor Gnd) , Pin 3 (Shield Gnd, Gnd to battery ) | |
| EC36-28 | +5V (to sensors) | - | HALL and other trigger that need +5V | |
| EC36-29 | +5V (TPS voltage divider) | - | TPS +5V | |
| EC36-30 | Drive_11 (misc output) | NA | ||
| EC36-31 | Drive_10 (misc output) | NA | ||
| EC36-32 | Analog Ground | - | - | Ground on the top of the cylinder head |
| EC36-33 | Coil #1 | Pin 1 (signal) | Cyl 2, Pin 15 (+), Pin 4a (Gnd Cyl. Head) | |
| EC36-34 | Coil #2 | Pin 1 (signal) | Cyl 3, Pin 15 (+), Pin 4a (Gnd Cyl. Head) | |
| EC36-35 | Coil #0 | Pin 1 (signal) | Cyl 1, Pin 15 (+), Pin 4a (Gnd Cyl. Head) | |
| EC36-36 | Coil #3 | Pin 1 (signal) | Cyl 4, Pin 15 (+), Pin 4a (Gnd Cyl. Head) | |
| EC18-1 | WBo2 #2 Nernst Cell | NA | ||
| EC18-2 | Exhaust backpressure | NA | ||
| EC18-3 | Fuel pressure | NA | ||
| EC18-4 | Stepper motor channel A | NA | ||
| EC18-5 | Stepper motor channel C | NA | ||
| EC18-6 | Drive_B (misc high current output) | NA | No FET installed | |
| EC18-7 | WBo2 Pump - | (-) on WBO2 | WBO2 | |
| EC18-8 | WBo2 #2 Pump + | NA | ||
| EC18-9 | WBo2 #1 Pump + | (+) on WBO2 | WBO2 | |
| EC18-10 | Stepper motor channel B | NA | ||
| EC18-11 | Stepper motor channel D | NA | ||
| EC18-12 | Drive_A (misc high current output) | NA | No FET installed | |
| EC18-13 | WBo2 #1 Nernst Cell | PIN ??? | WBO2 | |
| EC18-14 | Free | Pin 1 (Signal) | Knock sensor G61 - Pin 2 (Ref. Gnd) Pin 3 (Shield Gnd) | |
| EC18-15 | Free | Pin 1 (Signal) | Knock sensor G66 - Pin 2 (Ref. Gnd) Pin 3 (Shield Gnd) | |
| EC18-16 | Dallas 1-wire bus | NA | ||
| EC18-17 | WBo2 #2 Heater - | NA | ||
| EC18-18 | WBo2 #1 Heater - | PIN ??? | WBO2 | |
| Extra Pins | ||||
| - | EGT channel 1 | Separat EGT lead | ||
| - | LCD display | Separat LCD lead / Connector - DB9 | ||
| - | Keyboard | Separat Keyboard Connector - PS2 (wall mounted) | ||
| - | MAP | Separat MAP hose connection (Wall mounted) |
You may find:
http://www.vems.hu/wiki/index.php?page=MembersPage%2FPhatBob%2FUserGuide
Helpful
More info will come shortly