Wiring & Hardware

Wiring & hardware

ECU pinout links and the established wiring principles for CAN, analogue/NTC inputs, lambda interfaces and low-side relay outputs.

Use the ECU-specific pinout. Connector assignments differ by ECU model and hardware revision. The examples below explain the wiring principles; always check the correct pinout before making a loom.

ECU pin-outs

Delta 400 Delta 700 Delta 800 Delta 880 Delta 900 Delta GDI4 Delta GDI6

CAN accessories

Add-on-module wiring uses +12 V, ground, CAN L and CAN H. A DTM example is pin 1 +12 V, pin 2 ground, pin 3 CAN L and pin 4 CAN H, with 500 kbit/s used by the accessory described there. Do not assume that baud rate for every ECU network or accessory.

User Defined CAN inputs & outputs →

Sensor inputs

Temperature sensor inputs

Temperature inputs use NTC sensors referenced to Analog Ground. The example below shows coolant and air temperature sensors connected between their respective ECU inputs and the common Analog Ground.

NTC coolant and air temperature sensor wiring to ECU analogue ground. — Typical NTC temperature sensor wiring.

Auxiliary switched inputs

Auxiliary inputs such as Anti-Lag and Map Select are activated by switching the input to Analog Ground. Use the ECU-specific pin-out to identify the correct input and Analog Ground pins.

Auxiliary Anti-Lag and Map Select switch inputs wired to ECU Analog Ground. — Typical auxiliary switched-input wiring.

0–5 V linear analogue inputs

Linear 0–5 V sensors such as TPS, MAP and pressure sensors normally have a 5 V supply, Analog Ground and signal connection. Use the ECU-specific pin-out for the correct terminals and configure the sensor scaling in SXTune.

Typical 0 to 5 V TPS, MAP or pressure sensor wiring showing 5 V supply, signal and ground. — Typical 0–5 V linear sensor wiring.

Outputs and relay wiring

Delta relay outputs are low-side drivers: the ECU switches the negative side of the relay coil. The relay provides the higher-current switched supply required by devices such as cooling fans, air-conditioning compressors and fuel pumps.

Correct relay wiring showing ECU low-side control on terminal 85, switched 12 V on terminal 86, fused 12 V on terminal 30 and terminal 87 feeding the load. — Typical ECU-controlled low-side relay wiring.

Terminal	Function
85	Relay coil negative. Connect to the ECU low-side output.
86	Relay coil positive. Connect to a switched 12 V supply.
30	Common contact. Connect to a fused 12 V supply sized for the load.
87	Normally-open contact. Connect to the positive supply terminal of the fan, pump, compressor or other load.

Important: The ECU output is a low-side driver and grounds terminal 85 to energise the relay. The load itself must have its own ground connection. Do not connect terminal 87 directly to ground. Use suitable fuse protection and relay/contact ratings for the load, and use relay-coil suppression where required.

Cooling and auxiliary outputs

Cooling fans and other auxiliary devices are controlled through configured ECU outputs. Configure the physical output first, then set the operating thresholds and hysteresis for the function it controls.

Cooling fans

Independent fan on/off coolant-temperature thresholds are provided. Use separated on/off values to prevent rapid relay cycling. ECU relay outputs switch the ground side of the relay, so the vehicle wiring must provide the relay 12 V feeds correctly.

Other temperature-driven functions

Supported functions include hot-soak pump control, ECU stay-alive after key-off, chargecooler pump control and idle offsets when cooling fans or air conditioning add engine load.