00 · Hardware

48-pin map

48-way Molex, columns A–M (I skipped), rows 1–4. Looking into the ECU, polarising key at the top. A1 is top-left (CAN High, pin 48). M4 is bottom-right (12 V, pin 1). Typical functions are examples — assign them in TunerStudio.

Looking into ECU · key at topA1 top left · M4 bottom right

ABCDEFGHJKLM

Pin 1

12 V

12 V from main relay

TunerStudio · Battery Sense

Typical · 12 V from main relay output. See also E4 (pin 29). Do not forget L4 (pin 5).

ECU power after the main relay closes. Battery voltage is sensed here.

Must be fed from relay 87. Do not feed this from key-on alone.

Wire · Main relay 87 → M4. Fuse 5–10 A close to the battery.

Core EFI V4 48-way Molex connector, key at the top

V4 housing. Match the key to the top of this map. A is the CAN end.

Pin	Molex	TunerStudio	Type	Typical
1	M4	Battery Sense	12v	12 V from main relay output. See also E4 (pin 29). Do not forget L4 (pin 5).
2	M3	—	gnd	Power GND
3	M2	3 - Lowside 2	ls	VVT / idle
4	M1	—	etb	ETB motor +
5	L4	—	12v	12 V from key. Primary on/off supply.
6	L3	—	gnd	Power GND
7	L2	7 - Lowside 1	ls	VVT / idle
8	L1	—	etb	ETB motor −
9	K4	9 - Ignition 1	ign	Coil 1
10	K3	10 - Ignition 2	ign	Coil 2
11	K2	11 - Ignition 3	ign	Coil 3
12	K1	12 - Ignition 4	ign	Coil 4 · 6-cyl injector-driver channel 1
13	J4	13 - GP Out 6	gp_high	Tach / 6-cyl injector-driver 3 / 8-cyl injector-driver A
14	J3	14 - GP Out 5	gp_high	Tach / 6-cyl injector-driver 2 / 8-cyl injector-driver B
15	J2	—	usb	USB white wire
16	J1	—	usb	USB green wire
17	H4	—	agnd	Signal GND
18	H3	18 - AN temp 1	at	CLT
19	H2	19 - AN volt 4	av	Spare 0–5 V
20	H1	20 - AN volt 5	av	TPS (cable) or throttle-body TPS 1 (DBW)
21	G4	—	agnd	Signal GND
22	G3	22 - AN temp 4 or Hall Input or Flex	at	Oil temp / cam 2 / VSS / flex
23	G2	23 - AN temp 2	at	IAT
24	G1	24 - AN temp 3 or Hall Input or Flex	at	Spare temp / VSS / flex / analog pressure
25	F4	25 - Hall Cam	hall	Cam (sequential) or wheel speed (batch)
26	F3	26 - AN volt 2	av	TPS 2 (DBW) / oil pressure
27	F2	27 - AN volt 1	av	MAP
28	F1	28 - AN volt 10, Aux Reuse	av	Fuel pressure / spare analog
29	E4	Main Relay	mr	Main relay
30	E3	30 - AN volt 7	av	PPS 2 (DBW) / O2 / spare
31	E2	31 - AN volt 3	av	PPS 1 (DBW) / O2 / spare
32	E1	32 - AN volt 6, Aux Reuse	av	Wideband analog / spare
33	D4	33 - GP Out 3	gp_low	Spare / boost / stepper
34	D3	34 - GP Out 2	gp_low	Fan relay
35	D2	35 - GP Out 1	gp_low	Fuel pump relay
36	D1	36 - AN volt 8, Aux Reuse	av	Spare analog
37	C4	37 - Injector 1	inj	Injector 1 (4-cyl sequential)
38	C3	38 - Injector 2	inj	Injector 2 (4-cyl sequential)
39	C2	—	5v	MAP sensor supply
40	C1	40 - AN volt 9, Aux Reuse	av	Spare analog
41	B4	41 - Injector 3	inj	Injector 3 (4-cyl sequential)
42	B3	42 - Injector 4	inj	Injector 4 (4-cyl sequential)
43	B2	43 - GP Out 4	gp_low	Spare / boost / second pump relay
44	B1	—	5v	TPS sensor supply
45	A4	45 - VR/Hall Crank	vr	Crank VR+ / Hall
46	A3	—	vr	Crank VR− (do not connect if Hall)
47	A2	—	can	CAN bus Low
48	A1	—	can	CAN bus High