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Update FAQ-Basic-Wiring-and-Connections.md (#506) 

added extra main relay information
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Saleh mohammed 2024-05-27 03:24:29 +03:00 committed by GitHub
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@ -53,10 +53,56 @@ Unipolar stepper valves are not supported by any hardware variants at this time.
Logic exists in the firmware to control a drive by wire throttle body, including using it to idle. A single H-bridge is required to control a single DBW throttle body. Multiple DBW throttle bodies can be simultaneously controlled as long as sufficient H-bridge drivers exist to control them. A drive by wire pedal (Accelerator Pedal Position / APP) is generally used to provide input from the driver. Want to know more? here is a [guide](Electronic-Throttle-Body-Configuration-Guide) you should read.
### Main Relay support
### Main Relay support ("ECM RELAY")
The Main relay is a secondary power switch usually used to power INJECTORS/IGNITION/IDLE VALVES components that use 12v+ and comes on After ACC signals
Most hardware variants are set up to provide control over a main relay or auto-shutdown relay. The rusEFI ECU typically has two power feeds. Key-on power is supplied to the ECU in order to power the CPU and logic core of the ECU. High side drivers, H Bridges and other power switches are then powered by a "main relay" that is energized under the control of the ECU. Battery / continuous power is not required for setting retention.
some older car models have the main "EFI" or "ECU Relay" or "ECCS" as Nissan calls it those are the usual Terminology used to describe it
Usually works in this order
| 12V IN PIN | RELAY 12V OUT | EARTH (GND) | ECU (ON SIGNAL) |
| ------------- | ------------- | ------------- | ------------- |
| POWER FROM B+ (battery)| POWER TO ECU (after switching IGN) | GROUND PIN | SIGNAL TO OPERATE RELAY |
Technically Speaking while wiring ur new RusEFI ECU Unit you should see if your car starts the relay VIA "ECU PIN" from ur oem unit
or switched Externally VIA Ignition Key Switch
(**IF**) your car is "IGNITION SWITCH OPERATED RELAY" (NO ECM CONTROL) link VIGN and 12V(Switched B+ from ur old ecu wire) inputs together for BATT voltage to display correctly
<img width="561" alt="Screen Shot 2024-05-27 at 1 27 46 AM" src="https://github.com/EA11R/rusefi_documentation/assets/82368250/6c4891b7-fcf6-4978-8fe2-e06fe1ee0c98">
and the regular switched power Relay is refered as "12v+" "B+" in diagrams when connecting refrence power to ECU it's prefered to USE "RELAY 12V OUT" for Voltage Reading ("VIGN") in your case it's usually the only power Input pin in the ECU so it's your Voltage Refrence Signal(relay) and your 12V+ power to ECU
so a quick way to explain all of this is
Switch goes (ON) Position > EFI RELAY ON > ECU Gets power and EFI components in the same time
Relay Should tick even when ur ECU is out!
(**HOWEVER**) if your car is switched by a ECM pin take a free "LS" low side output and replace ur old relay operation signal with it
feedback VIGN with power returning from MAIN RELAY They're usually labeled in manuals as "ECU POWER" "ECU 12V"
<img width="631" alt="Screen Shot 2024-05-27 at 1 35 14 AM" src="https://github.com/EA11R/rusefi_documentation/assets/82368250/1e83bf27-a440-41db-8186-6b0367cbd5e0">
as you can see in the ECCS example pin 16 here should be RusEFI lowside
and pin 49 should be your relay power IN (VIGN)
so a quick way to explain all of this is
Switch goes (ON) Position > ECU Gets power > ECU sends a ground Signal to EFI Relay > you get powers to EFI components!
## Specific Function Inputs
Engine position (crank, cam) are specific inputs required. Hall Effect (square wave / magnetic or optical) and Variable Reluctance (VR / inductive) sensors are supported.