Generation 2 Manual ECU wiring by Rabbit

Thanks to Bart, Christian, Damian and Mohamed.

ECU - Mitsubishi Genuine Part Number MD331116, MD335999


1	2	3									12	13
1	2	3	4	5	6	7	8	9	10	11	12	13
14	15	16									25	26
14	15	16	17	18	19	20	21	22	23	24	25	26

(B-60)



31	32	33	34	35	36	37	38

39	40	41	42	42	44	45	46

(B-61)



51	52	53	54	55	56

57	58	59	60	61	62

(B-62)


71									80	81
71	72	73	74	75	76	77	78	79	80	81
82									91	92
82	83	84	85	86	87	88	89	90	91	92

Maybe compatable with all of the following MD335299, MD352555, MD336610, MD352556, MD334383, MD331116

B-59

Pin #	IN / OUT	Wire size (mm²)	Wire colour	Sheild	Description	Paired with	Test	Result
1	IN	0.85	Yellow with Blue trace		Injector 1 ground control		@ warm idle: Quickly depress accelerator	~11 - 14.4v: Short dip in voltage
2	IN	0.85	Blue with Green trace		Injector 3 ground control		@ warm idle: Quickly depress accelerator	~11 - 14.4v: Short dip in voltage
3					No connection
4	IN	0.50	Blue with Yellow trace		Idle speed control servo (coil A1)	17	@ warm idle: Stop and restart engine	~0.0 - 6.0v repeating
5	IN	0.50	Solid White		Idle speed control servo (coil B1)	18	@ warm idle: Stop and restart engine	~0.0 - 6.0v repeating
6					No connection
7					No connection
8	IN	0.50	Black with Blue trace		Fuel pump relay ground control		With key ON @ idle	~12.0 - 14.4v ~0.0 - 3.0v
9					No connection
10	OUT	0.50	Black with Yellow trace		Ignition tower transistor A (? cyl 2 & 3)	23	With engine @3000rpm	~0.3 - 3.0v
11					No connection
12	IN	0.50	Red with Yellow trace		Power source	38	With key ON	~12.0 - 14.4v
13	OUT	1.25	Solid Black		Chassis ground		Resistance to chassis	0.0 Ohms
Pin #	IN / OUT	Wire size (mm²)	Wire colour	Sheild	Description	Paired with	Test	Result
14	IN	0.85	Yellow with Black trace		Injector 2 ground control		@ warm idle: Quickly depress accelerator	~11 - 14.4v: Short dip in voltage
15	IN	0.85	Light Green with White trace		Injector 4 ground control		@ warm idle: Quickly depress accelerator	~11 - 14.4v: Short dip in voltage
16					No connection
17	IN	0.50	Solid Yellow		Idle speed control servo (coil A2)	4	@ warm idle: Stop and restart engine	~0.0 - 6.0v repeating
18	IN	0.50	Solid Green		Idle speed control servo (coil B2)	5	@ warm idle: Stop and restart engine	~0.0 - 6.0v repeating
19					No connection
20	IN	0.30	Solid Blue		(?) Fan relay (high) (? A/C control unit)	21	Fan (off) & temp <90^oc Fan (fast) & temp >105^oc	~12.0 - 14.4v ~0.0 - 3.0v
21	IN	0.50	Solid Blue		(?) Fan relay (low) (? A/C ??? )	20	Fan (off) & temp <90^oc Fan (slow) & temp >105^oc	~12.0 - 14.4v ~0.0 - 3.0v
22	IN	0.30	Green with White trace		A/C clutch relay	45	@ idle (A/C off): A/C ON	~12.0 - 14.4v (>6.0v): ~0.0 - 3.0v
23	OUT	0.50	Black with Green trace		Ignition power transistor B (? cyl 1 & 4)	10	With engine @3000rpm	~0.3 - 3.0v
24					No connection
25	IN	0.50	Red with Yellow trace		Power source	38	With key ON	~12.0 - 14.4v
26	OUT	1.25	Solid Black		Ground ( + O2 sensor wire shielding)		Resistance to chassis	0.0 Ohms

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B-60

Pin #	IN / OUT	Wire size (mm²)	Wire colour	Sheild	Description	Paired with	Test	Result
31					No connection
32					No connection
33	IN	0.50	Blue with White trace		(?) Alternator 'G'	41	@ warm idle (fan off): Turn ON headlights	~0.2 - 3.5v: Voltage drop
34	IN	0.50	Red with Blue trace		Oil control valve switch ground control (MIVEC solenoid)		???	???
35					No connection
36	IN	0.50	Light Green with Black trace		Engine check light ground control (dash)		Turn key from OFF to ON	~0.0 - 3.0v rising to 9.0 - 14.4v afterseveral seconds.
37	OUT	0.85	Yellow with Black trace		5v to powersteering oil pressure switch		@ warm idle: Stationary Turning steering wheel	~12.0 - 14.4v ~0.0 - 3.0v
38	IN	0.50	Solid Red		Engine control relay ground control (turns on 12 & 25)	12 & 25	With key ON With key OFF	~12.0 - 14.4v ~0.0 - 3.0v
Pin #	IN / OUT	Wire size (mm²)	Wire colour	Sheild	Description	Paired with	Test	Result
39					No connection
40	IN	0.50	Blue with White trace		Alarm light ground control (dash)		???	???
41	OUT	0.50	Solid White		5v to Alternator 'FR'	41	@ warm idle (fan off): Turn on headlights	~0.2 - 3.5v: Voltage drop
42					No connection
43					No connection
44					No connection
45	IN	0.30	Green with Black trace		A/C (? Engine coolant Temperature switch)	22	@ idle: AC OFF AC ON	~0.0 - 3.0v ~12.0 - 14.4v
46					No connection

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B-61

Pin #	IN / OUT	Wire size (mm²)	Wire colour	Sheild	Description	Paired with	Test	Result
51					No connection
52					No connection
53					No connection
54					No connection
55					No connection
56	OUT	0.50	Solid Light Green		Diagnositc connector (pin 1)	62	???	???
Pin #	IN / OUT	Wire size (mm²)	Wire colour	Sheild	Description	Paired with	Test	Result
57					No connection
58	OUT	0.50	Solid White		RPM Signal		@ idle:	Factory tacho needle reading ~650 - 1500 rpm
59					No connection
60	IN	0.50	Solid Red		O2 sensor ground control (heater element)	76	@ warm idle: ~5000 rpm	~0.0 - 3.0v ~12.0 - 14.4v
61					No connection
62	OUT	0.50	Solid Orange		Diagnositc connector (pin 7)	56	???	???

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B-62

Pin #	IN / OUT	Wire size (mm²)	Wire colour	Sheild	Description	Paired with	Test	Result
71	IN	1.25	Black with Yellow trace		Starter relay	91	Cranking engine	~8.0v or more
72	OUT	0.50	Red with White trace		5v to Air intake temperature sensor		With key ON: temp 0^o temp 20^o temp 40^o temp 80^o	~3.2 - 3.8v ~2.3 - 2.9v ~1.5 - 2.1v ~0.4 - 1.0v
73					No connection
74	OUT	0.50	Solid Pink		High temp sensor (+)	77	???	???
75					No connection
76	IN	0.50	Solid White	Y	O2 sensor (heated type)	60	@ warn idle: hold @ 2500 rpm	(digital multimeter) ~0.0 - 0.8v Repeating
77	IN	0.50	White with Blue trace		High temp sensor (-)	74	???	???
78	IN	0.50	Solid White	Y	Detonation sensor		???	???
79					No connection
80	IN	0.50	Red with Black trace		Battery backup		With key OFF	~12.0 - 14.4v
81	OUT	0.50	Green with Blue trace		5v to Throttle position sensor Atmospheric/Barometric pressure sensor		With key ON	~4.5 - 5.5v
Pin #	IN / OUT	Wire size (mm²)	Wire colour	Sheild	Description	Paired with	Test	Result
82	IN	1.25	Black with White trace		Gets 12v when the key is turned to start		With key ON With key OFF	~12.0 - 14.4v ~0.0 - 3.0v
83	OUT	0.50	Yellow with Green trace		5v to engine coolant temperature sensor		With key ON: temp 0^o temp 20^o temp 40^o temp 80^o	~3.2 - 3.8v ~2.3 - 2.9v ~1.3 - 1.9v ~0.3 - 0.8v
84	IN	0.50	Green with White trace		Throttle position sensor		@ idle @ Wide open throttle	~0.3 - 1.0v ~4.5 - 5.5v (Voltage increase smoothly as throttle is opened)
85	IN	0.50	Yellow with Red trace		Atmospheric/Barometric pressure sensor (MAP)		@ idle Stab accelerator pedal	~0.8 - 2.4v Sudden voltage rise
86	OUT	0.50	Solid Yellow		Vechicle speed sensor		With key ON: move vechicle slowly forward	~0.0 - 5.0v Repeating
87	OUT	0.50	Yellow with Red trace		Idle switch (in Throttle position sensor)		With key ON: Throttle closed Throttle opened	~0.0 - 1.0v > 4.0v
88	OUT	0.50	Blue with Red trace		Camshaft position sensor		Cranking engine @ idle	~0.4 - 3.0v ~0.5 - 2.0v
89	OUT	0.50	Brown with Green trace		Crank angle sensor		Cranking engine @ idle	~0.4 - 4.0v ~1.5 - 2.5v
90					No connection
91	OUT	1.25	Solid Black		Ground	71	Continuity to chassis	True
92	IN	0.50	Solid Black		Ground for: Throttle position sensor, Atmospheric/Barometric pressure sensor, Engine coolant temperature sensor, Plus others		Continuity to chassis	True

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Notes:

IN and OUT are current flow (eg: an IN can connect to ground completing a circuit through a relay and turn on enternal devices)
It maybe a pair is the up/down 'base idle' and the other is up/down 'fast speed idle' for power steering and Air conditioning (A/C)
4(IN) & 17(IN) = Idle speed control servo (coil A) ( both switch to ground) (connect to pins 1 & 3 on servo)
5(IN) & 18(IN) = Idle speed control servo (coil B) (both switch to ground) (connect to pins 4 & 6 on servo)
( servo pins 2 and 5 are connected to the engine control relay)