I'm going to be wiring up megasquirt on my 318is soon in preparation for turbo, but I can't seem to find the pinout or wiring diagrams for the 55-pin connector that plugs into the DME (175-label). I can find the ones for M20 cars, but I'd assume the M42 DME has a few differences. If anyone can post or link it here, that would be great.
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And as soon as I posted, I found it. It's actually 88 pin. oops. Here it is for future reference:
Motronic Control unit
Function Color
1 Fuel Pump Relay BR/GN
2
3 Injectors 1-3 BR/WT
4
5
6 Ground BR/OR
7
8 Check Engine light BR
9
10
11
12 TPS Signal 5v BR
13
14 Common 5v GY/BU
15
16 Camshaft sensor input YL
17 Fuel rate output WT
18
19
20
21
22
23
24 Ignition cyl 3 BK
25 Ignition cyl 1 BK
26 Power Input RD/WT
27 Main Relay control BR
28 Ground BR/OR
29 Idle Speed Control WT/YL
30
31
32 Injectors 2-4 BR/WT
33
34 Ground
35
36 Charcoal Canister control BR
37 O2 relay control BR/GN
38
39
40
41 AFM Input (5v) GY/YL
42
43 Common 5v Coolant and TPS BR/BK
44 Camshaft sensor input BK
45
46
47
48
49
50
51 Ignition cyl 4 BK
52 Ignition cyl 2 BK
53
54 Power Input RD/WT
55 Ground
56 Start Input GN/YL
57
58
59 Refrence output (Ground??) GY/WT
60
61
62
63
64
65
66
67 Crankshaft input sensor BK
68 Crankshaft input sensor YL
69
70 O2 Input BK
71 O2 Ground YL
72
73 Speed Signal input BK/WT
74 Engine Speed Output
75
76
77 Air temp input GY/VI
78 Coolant temp input BR/RD
79
80 Diagnostic voltage GN/BU
81
82
83
84
85 A/C Input BK/GY
86 A/C Input BK/VI
87 RXD Diagnostic WT/YL
88 TXD Diagnistic WT/VI
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