Which pins are CAN on the Haltech Nexus T1?

CAN High: pin 16 (White, W). CAN Low: pin 17 (Blue, L).

Which pins are the crank and cam inputs on the Haltech Nexus T1?

Trigger +: pin 31 (Yellow, Y). Home +: pin 32 (Yellow, Y). Trigger -: pin 33 (Green, G). Home -: pin 34 (Green, G).

Which pins are the injector outputs on the Haltech Nexus T1?

Injector 1: pin 19 (Blue, L). Injector 2: pin 20 (Blue with black stripe, L/B). Injector 3: pin 21 (Blue with brown stripe, L/BR). Injector 4: pin 22 (Blue with red stripe, L/R).

Which pins are the ignition outputs on the Haltech Nexus T1?

Ignition 1: pin 3 (Yellow with black stripe, Y/B). Ignition 2: pin 4 (Yellow with red stripe, Y/R). Ignition 3: pin 5 (Yellow with orange stripe, Y/O). Ignition 4: pin 6 (Yellow with green stripe, Y/G).

Which pins are ground on the Haltech Nexus T1?

Power ground: pin 10 (Black, B). Sensor ground: pin 11 (Black with white stripe, B/W).

Which pins power the Haltech Nexus T1?

+12V ECU power supply: pin 26 (Red, R).

Which pins are the sensor supplies on the Haltech Nexus T1?

+5V sensor supply: pin 9 (Orange, O).

Pinout

Haltech Nexus T1 pinout

Every pin of the 34-pin connector, with the wire colours of Haltech's harness. Tap a pin to see what it does.

Every pin checked against 2 Haltech documents

34-pin connectorLooking into the connector on the ECU

Pick any pin on the drawing or in the table to see its function, its wire colour and the documents it was checked in.

Haltech Nexus T1 34-pin connector pinout

Pin	Function	Wire
1	DPO 2	V/BRViolet with brown stripe
2	AVI 1	WWhite
3	Ignition 1	Y/BYellow with black stripe
4	Ignition 2	Y/RYellow with red stripe
5	Ignition 3	Y/OYellow with orange stripe
6	Ignition 4	Y/GYellow with green stripe
7	Not used	-
8	Not used	-
9	+5V sensor supply	OOrange
10	Power ground	BBlack
11	Sensor ground	B/WBlack with white stripe
12	SPI 1	GY/BRGrey with brown stripe
13	Knock / SPI 2	WWhite
14	AVI 2	W/YWhite with yellow stripe
15	AVI 3	W/GYWhite with grey stripe
16	CAN High	WWhite
17	CAN Low	LBlue
18	DPO 1	V/BViolet with black stripe
19	Injector 1	LBlue
20	Injector 2	L/BBlue with black stripe
21	Injector 3	L/BRBlue with brown stripe
22	Injector 4	L/RBlue with red stripe
23	DPO 3	V/RViolet with red stripe
24	DPO 5	V/YViolet with yellow stripe
25	DPO 4	V/OViolet with orange stripe
26	+12V ECU power supply	RRed
27	Not used	-
28	Not used	-
29	AVI 4	W/VWhite with violet stripe
30	AVI 5	W/GWhite with green stripe
31	Trigger +	YYellow
32	Home +	YYellow
33	Trigger -	GGreen
34	Home -	GGreen

Haltech Nexus T1 pins at a glance

Which pins are CAN on the Haltech Nexus T1?: CAN High: pin 16 (White, W). CAN Low: pin 17 (Blue, L).
Which pins are the crank and cam inputs on the Haltech Nexus T1?: Trigger +: pin 31 (Yellow, Y). Home +: pin 32 (Yellow, Y). Trigger -: pin 33 (Green, G). Home -: pin 34 (Green, G).
Which pins are the injector outputs on the Haltech Nexus T1?: Injector 1: pin 19 (Blue, L). Injector 2: pin 20 (Blue with black stripe, L/B). Injector 3: pin 21 (Blue with brown stripe, L/BR). Injector 4: pin 22 (Blue with red stripe, L/R).
Which pins are the ignition outputs on the Haltech Nexus T1?: Ignition 1: pin 3 (Yellow with black stripe, Y/B). Ignition 2: pin 4 (Yellow with red stripe, Y/R). Ignition 3: pin 5 (Yellow with orange stripe, Y/O). Ignition 4: pin 6 (Yellow with green stripe, Y/G).
Which pins are ground on the Haltech Nexus T1?: Power ground: pin 10 (Black, B). Sensor ground: pin 11 (Black with white stripe, B/W).
Which pins power the Haltech Nexus T1?: +12V ECU power supply: pin 26 (Red, R).
Which pins are the sensor supplies on the Haltech Nexus T1?: +5V sensor supply: pin 9 (Orange, O).

Haltech Nexus T1 pinout sheet

A printable sheet with the connector drawings and every pin, made from the checked data on this page.

Download PDF Download diagram (PNG)

Haltech Nexus T1 pinout diagram with wire colours

Where this comes from

Only Haltech's own documents. Pin names and notes are written exactly as Haltech writes them.

Haltech wire colour codes

B = Black
BR = Brown
G = Green
GY = Grey
L = Blue
O = Orange
R = Red
V = Violet
Y = Yellow
W = White

Two letters: the first is the wire colour, the second is the stripe.

How we checked it

We start from Haltech's pinout table for this ECU.
We read every pin again from a second Haltech document, the wiring diagram or the quick start guide. A script compares the two, pin by pin.
A pin is only shown when its function and its wire colour match in both. Where a diagram has no text to read, we read the pins off the drawing itself.
The notes are Haltech's own words from its pinout table.

Where Haltech's documents disagree

Pin 1: the T2/T1 harness diagram tags this wire [V/R], the same tag as DPO 3 on pin 23, but draws it violet with a brown stripe on both harness sheets. Haltech's T2/T1 pinout lists pin 1 as Violet / Brown, so that is what we show.

Pin 7: the T2/T1 harness diagram is shared by both ECUs and draws Ignition 5 on this pin; it notes "IGNITION OUTPUTS 5-6 ARE NOT AVAILABLE ON A NEXUS T1 ECU". Haltech's pinout lists pin 7 as "Ignition 5 (Nexus T2 only)". On a Nexus T1 this pin is not used.

Pin 8: the T2/T1 harness diagram is shared by both ECUs and draws Ignition 6 on this pin; it notes "IGNITION OUTPUTS 5-6 ARE NOT AVAILABLE ON A NEXUS T1 ECU". Haltech's pinout lists pin 8 as "Ignition 6 (Nexus T2 only)". On a Nexus T1 this pin is not used.

Pin 27: the T2/T1 harness diagram is shared by both ECUs and draws Injector 5 on this pin; it notes "INJECTOR OUTPUTS 5-6 ARE NOT AVAILABLE ON A NEXUS T1 ECU". Haltech's pinout lists pin 27 as "Injector 5 (Nexus T2 only)". On a Nexus T1 this pin is not used.

Pin 28: the T2/T1 harness diagram is shared by both ECUs and draws Injector 6 on this pin; it notes "INJECTOR OUTPUTS 5-6 ARE NOT AVAILABLE ON A NEXUS T1 ECU". Haltech's pinout lists pin 28 as "Injector 6 (Nexus T2 only)". On a Nexus T1 this pin is not used.

ECU Recovery is not affiliated with Haltech. Haltech and Elite are trademarks of Haltech. If your harness came with its own diagram, check your wiring against it.

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