Hi folks,
Has anyone got a diagram of what pin does what on an m42 ecu plug?
Anyone got a diagram for what pin does what on ecu plug?
Moderator: martauto
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- E30 Zone Regular
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Found it:
Motronic ECU M42 88pin plug

Function Color
1 Fuel Pump Relay BR/GN
2
3 Injectors 1-3 BR/WT
4
5
6 Earth 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 Position Sensor input YL
17 Fuel rate output WT
18
19
20
21
22
23
24 Ignition coil cylinder 3 BK
25 Ignition coil cylinder 1 BK
26 Power Input from battery RD/WT
27 Main Engine Relay control BR
28 Earth BR/OR
29 Idle Speed Control WT/YL
30
31
32 Injectors 2-4 BR/WT
33
34 Ground
35
36 Evaporative emission Charcoal Canister control BR
37 Oxygen Sensor Heater relay control BR/GN
38
39
40
41 AFM Input (5v) GY/YL
42
43 Common 5v Engine Coolant Temperature, knock sensor, and TPS BR/BK
44 Camshaft Position sensor input BK
45
46
47
48
49
50
51 Ignition cyl 4 BK
52 Ignition cyl 2 BK
53
54 Power Input ( Engine control Relay?) RD/WT
55 Earth
56 Ignition switch Input GN/YL
57
58
59 Reference output (Ground??) GY/WT
60
61
62
63
64
65
66
67 Crankshaft Position input sensor BK
68 Crankshaft Position input sensor YL
69
70 Oxygen Sensor Input BK
71 Oxygen Sensor Earth YL
72
73 Speed Signal input to instrument panel BK/WT
74 Engine Speed Output to instrument panel
75
76
77 Intake 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 Control BK/VI
87 RXD Diagnostic WT/YL
88 TXD Diagnistic WT/VI
Motronic ECU M42 88pin plug

Function Color
1 Fuel Pump Relay BR/GN
2
3 Injectors 1-3 BR/WT
4
5
6 Earth 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 Position Sensor input YL
17 Fuel rate output WT
18
19
20
21
22
23
24 Ignition coil cylinder 3 BK
25 Ignition coil cylinder 1 BK
26 Power Input from battery RD/WT
27 Main Engine Relay control BR
28 Earth BR/OR
29 Idle Speed Control WT/YL
30
31
32 Injectors 2-4 BR/WT
33
34 Ground
35
36 Evaporative emission Charcoal Canister control BR
37 Oxygen Sensor Heater relay control BR/GN
38
39
40
41 AFM Input (5v) GY/YL
42
43 Common 5v Engine Coolant Temperature, knock sensor, and TPS BR/BK
44 Camshaft Position sensor input BK
45
46
47
48
49
50
51 Ignition cyl 4 BK
52 Ignition cyl 2 BK
53
54 Power Input ( Engine control Relay?) RD/WT
55 Earth
56 Ignition switch Input GN/YL
57
58
59 Reference output (Ground??) GY/WT
60
61
62
63
64
65
66
67 Crankshaft Position input sensor BK
68 Crankshaft Position input sensor YL
69
70 Oxygen Sensor Input BK
71 Oxygen Sensor Earth YL
72
73 Speed Signal input to instrument panel BK/WT
74 Engine Speed Output to instrument panel
75
76
77 Intake 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 Control BK/VI
87 RXD Diagnostic WT/YL
88 TXD Diagnistic WT/VI

M42 - rightness! with proper 4.27 LSD