Siemens 5WY 2 Connector Pinout

Note: SIMK41 and SIMK43 pinouts are different! Using the wrong ECM or harness will result in damage to your vehicle! Use at your own risk. Verify the type of ECM and harness before proceeding.

SIMK41 2MBit (MAP)

ECM Socket 81-pin
Pin	Type	Description	Notes
1	Ground	Ground
2	Ground	Ground
3	Input	Memory Power Supply (ECM Fuse)
4	Output	Ignition Coil #1
5	Output	Ignition Coil #2
6	I/O	CANBUS Low
7	I/O	CANBUS High
8	Output	O2 Sensor Heater Control
9	Output	O2 Sensor Heater control
10	Input	Knock Sensor
11
12
13
14	Input	Battery (From SNSR Fuse)
15
16
17	Input	Wheel Speed Sensor (Right Front)
18	Input	Wheel Speed Sensor (Right Front)
19
20
21	Input	Battery (From SNSR Fuse)
22	Input	On/Start Input
23	Output	Injector #4 Control
24	Output	Injector #1 Control
25
26	Output	Canister Purge Valve Control
27	Ground	Crankshaft Position Sensor Ground
28
29	Input	Crankshaft Position Sensor Signal
30	Ground	Knock Sensor and Camshaft Shared Ground
31	Input	Engine Coolant Temperature Input
32	Input	Throttle Position Signal (TPS)
33	Input	Fuel Tank Pressure Sensor Signal
34	Ground	Fuel Tank Pressure Sensor Ground
35
36
37
38	Ground	Throttle Position Ground
39	Input	Vehicle Speed Input
40
41
42	Input	O2 Sensor Signal Bank 1 Sensor 2
43	Input	O2 Sensor Signal Bank 1 Sensor 1
44	Output	Fuel Tank Pressure Sensor and Manifold Absolute Pressure Shared Power
45	Output	Throttle Position Power
46
47	I/O	Immobilizer W-Line
48	Ground	Manifold Absolute Pressure Ground
49
50	Input	Air Conditioner Signal Input
51	Input	Air Conditioner Pressure Switch Input
52
53
54
55	Ground	Ignition Coil Shield Ground
56	Input	Intake Air Temperature Signal
57
58	Input	Air Conditioner Switch On
59	Ground	O2 Sensor and Engine Coolant Temperature Shared Ground
60	Input	Manifold Absolute Pressure Signal
61	Output	Injector #3 Control
62	Output	Injector #2 Control
63
64	Output	Fan Relay Control (High)
65	Output	Fan Relay Control (Low)
66	Output	Engine RPM Signal
67	Input	Engine Control Relay Control
68	Output	Air Conditioner Relay Control
69	Output	Fuel Pump Relay Control
70	Output	MIL Indicator Control
71
72	Input	Camshaft Sensor Signal
73
74
75	Output	Injector Signal
76
77	I/O	Diagnostics K-Line (OBD2)
78	Output	Idle Air Control Valve (Open)
79	Output	CCV Control
80	Output	Idle Air Control Valve (Close)
81	Output	Immobilizer Indicator Control

SIMK43 4MBit (MAF)

ECM Socket 81-pin
Pin	Type	Description	Notes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81