Ford Sierra Cosworth Wiring Diagram
Thanks for the explanations chaps - its really helpful .
The link i/o table specifically mentions that pins 15 & 16 are temp inputs for use with NTC Thermistor sensors and AN1-4 are Voltage - i didn't consider this before asking my question on the need for a resistor , again - thank you for the guidance.
Oil Temp
i bench tested the Oil temp gauge as per Adams instructions and I'm reading 12v with my multimeter at the sensor terminal . I feel that it seems to be more aggro than its worth. I'm going to dismiss the Oil temp feed to the ECU.
Oil & Fuel pressure
Oil & Fuel pressure inputs sound very much like they are worth having , so i want to pursue this. Both are 3 wire sensors (Black - ground / Red - 5v / White - Signal) . Duplicate sensors aren't practical in my installation so i'm going to leave the 5v feed to the sensors as coming from the gauges and spur off the white signal wire and connect these spurs to AN Volt 1 (p17) & AN Volt 2 (p22) .
The question remains regarding what i do about the ground side for these 2 sensors ? I've never heard of Ground Offsets or Ground Looping - so would appreciate your help with this. Leaving the ground wire going to straight to the gauge would be the most simple option - especially if i don't need to spur off this and connect to Ground out on the ECU (pin 24) . Do you think this will be OK ?
My intention is to keep the ECU harness completely separate from the main body harness , with just a single plug close to the ECU under my dash for any wires that need connecting from 'the outside'. The Oil & Fuel pressure sensor wires to their gauges will be in the body loom , but will pass very close to the Engine Ground point that i'll be using for the Link ECU . I could easily spur off the ground wire between sensor and gauge at this point and connect it to the same Engine Ground point - would this help negate the potential effects of Ground Offsets or Ground Looping ?
Low Oil Pressure / Check Engine Warning
Picking up on Kris's point regarding Oil warning lights. Currently my body loom diagrams use the std. Ford low oil pressure switch (single terminal pressure switch that goes to ground at around 3-5 psi) The warning lamp is fed by an ignition switched , fused , 12v supply. At such low pressure - it's not much of a warning , and by the time it lights up at just 5psi any engine damage is typically done.
Can i use ECU pin 26 Aux Out (not currently assigned) to ground my low oil pressure warning light - using a programmable value in the ECU (say 20psi) instead of the factory 5 psi switch ? Will the existing 12v supply to the warning lamp be a problem ?
Going a stage further - is there a way to combine both the low oil pressure and check engine warnings using the same lamp ? I'm thinking that the light could be permanently on for low oil pressure and flash on & off for a check engine warning ? To achieve this, would i connect both Pin 27 (check engine) and Pin 26 (low oil pressure) to the same warning lamp - or could the ECU be programmed to output a continuous ground for my pre programmed low oil pressure value and an intermittent ground in the case of a check engine warning via the same auxiliary output pin ?
Again , many thanks for your help - its much appreciated
Lee
Posted by: deko471.blogspot.com
Source: https://forums.linkecu.com/topic/13585-wiring-a-link-monsoon-g4x-to-a-cosworth-yb-engine-ive-created-a-schematic-but-is-it-correct/