Compiled by NefMoto - http://nefariousmotorsports.
com
Audi ECU Pin Numbering (Facing ECU, not harness)
2001 S4 J220 Motronic Engine Control Module (ECM)
Pin # Color Traced Description
1 br y Ground - connected with pin 2
2 br y Ground - connected with pin 1
3 sw/bl y Switched +12v power connected to terminal 15
4 ge/bl Pin 2 Z28 Oxygen sensor (OS2) 2 heater for G108
5 ge/gn Pin 2 Z19 Oxygen Sensor (OS2) 1 Heater for G39
6 ge/ws Pin 2 Z30 Oxygen sensor heater in oxygen sensor G131
7
8
9 gn/ge N8 Central Idle, Idle Air Control (IAC) Cut-Off Valve
10 li y Pin 3 G131 oxygen sensor 2 behind three way catalytic convertor - (O2S)
2 – Postcat
11 ro y Pin 4 G131 oxygen sensor 2 behind three way catalytic convertor - (O2S)
2 – Postcat
12 br y Pin 3 G108 Heated oxygen sensor 2 - (HO2S) 2 - Precat
13 ws y Pin 4 G108 Heated oxygen sensor 2 - (HO2S) 2 - Precat
14 ge/bl Pin 2 Z29 Oxygen Sensor (O2S) 2 Heater
15
16
17
18
19 bl/li Engine overheat warning light instrument wiring harness, goes to
instrument cluster
20 bl/ro G236 Sensor 2 for exhaust temperature
21
22
23
24
25 ge/ro Pin 1 of leak detection pump
26
27 sw/gn Pin 3 of G70 Mass Air Flow (MAF) Sensor, ground
28
29 gn Pin 4 of G70 Mass Air Flow (MAF) Sensor
30 sw/li T32/6 of J218 Instrument Cluster
31
32 sw Ground
33 gr/ge y Pin 4 G185 Sender for accelerator pedal position 2
34 br/gn y Pin 6 G185 Sender for accelerator pedal position 2
35 ge/bl y Pin 1 G79 Throttle position sensor (Accelerator Pedal Position 1)
36 br/ro y Pin 3 G79 Throttle position sensor (Accelerator Pedal Position 1)
37 gn/bl RPM signal instrument wiring harness
38 sw/ws Pin 6 & 4 E45 Cruise Control Switch
39 ro/gn Pin 1 F36 Clutch vacuum vent valve switch - manual only
40 sw/ge 15 point red wire connector in electronics box plenum chamber?
41 sw/gr T2/87 in instrument wiring harness?
42
43 gn/sw K-diagnosis wire in instrument cluster wiring harness
44 ge/gn N112 Secondary Air Injection (AIR) Solenoid Valve - automatic only
45
46 bl/gr J299 Seconday Air Injection (AIR) Pump Relay - automatic only
47 ge/br instrument cluster combination processor
48 ro/br instrument cluster combination processor
49
50 y
51 ge y Pin 3 G39 Heated Oxygen Sensor 1 - (HO2S) 1 - Precat
52
53 li/gr Pin 1 of G70 Mass Air Flow (MAF) Sensor, +5v
54 ws/bl Vehicle speed signal intrument wiring harness
55 ws/ro Pin 4 Brake light switch
56 ro/sw Pin 2 Brake light switch
57 ro/ge Pin 3 E45 Cruise Control Switch
58 or/br CAN Low bus in instrument wiring harness to power train bus
59
60 or/sw CAN High bus in instrument wiring harness to power train bus
61 bl/br G235 Sensor 1 for exhaust temperature
62 Constant +12v from terminal 30 (battery)
63 ge/ro Pin 2 Z29 oxygen sensor heater in oxygen sensor G130
64 li/ws N80 Evaporative Emission (EVAP) Canister Purge Regulator Valve
65 ro/bl Fuel Pump Relay
66 ro battery?
67 li/bl J234 Airbag control module and crash signal in instrument wiring
harness
68 gr y Pin 3 G130 oxygen sensor 1 behind three way catalytic convertor - (O2S)
1 – Postcat
69 bl y Pin 4 G130 oxygen sensor 1 behind three way catalytic convertor - (O2S)
1 – Postcat
70 gn y Pin 4 G39 Heated oxygen sensor 1 - (HO2S) 1 - Precat
71
72 gr Pin 5 G185 Sender for accelerator pedal position 2, +5v
73 ge/li Pin 2 G79 Throttle position sensor (Accelerator Pedal Position 1)
74 gn/br 15 point red wire connector in electronics box plenum chamber?
75 bl Pin 2 E45 Cruise Control Switch
76 ro/gr Pin 1 E45 Cruise Control Switch
77
78
79
80 ws/ge Pin 2 of leak detection pump
81 ge ??? - not ground
82 gr G28 Engine speed sensor
83 br/ro Pin 2 J338 Throttle Valve Control Module
84 sw/br y Pin 4 J338 Throttle Valve Control Module - Sensor 2?
85 gn/ws Pin 1 G42 Intake air temperature sensor
86 gn/li Pin 2 G163 Camshaft position sensor (CMP) 2
87 bl/li Pin 2 G40 Camshaft position sensor (CMP) 1
88 br/li y Cylinder 3 Fuel Injector - seems to fire the injector when 0 volts
89 ws/ge y Cylinder 6 Fuel Injector - seems to fire the injector when 0 volts
90 bl G28 Engine speed sensor
91 gn/ro Pin 6 J338 Throttle Valve Control Module
92 sw/gr y Pin 1 J338 Throttle Valve Control Module - Sensor 1?
93 gr/ro y Pin 4 G62 Engine coolant temperature sensor
94 gr/ge y ? N122 Power output stage
95 gr/br y ? N192 Power output stage 2
96 br/sw y Cylinder 1 Fuel Injector - seems to fire the injector when 0 volts
97 br/gn y Cylinder 4 Fuel Injector - seems to fire the injector when 0 volts
98 gn/sw +5 volt
99 ws Ground
100
101 bl/gr Pin 4 G31 Charge air pressure sensor
102 ws/gn y ? N122 Power output stage
103 ws/br y ? N192 Power output stage 2
104 bl/gn N75 Wastegate Bypass Regulator Valve
105 N249 Divert Air Valve
106 br G61 Knock sensor (KS) 1
107 gn G66 Knock sensor (KS) 2
108 br/gr Ground - sensor ground
109
110 gn/gr y ? N122 Power output stage
111 gn/br y ? N192 Power output stage 2
112 br/bl y Cylinder 2 Fuel Injector - seems to fire the injector when 0 volts
113 br/gr y Cylinder 5 Fuel Injector - seems to fire the injector when 0 volts
114 Not connected
115 br/gr N205/N208 Valve for camshaft 1/2 adjustment, running change though
MY2000, 2001 may be diff
116 Not connected
117 ro/li Pin 3 J338 Throttle Valve Control Module - Valve Control Voltage?
118 br/li Pin 5 J338 Throttle Valve Control Module
119 Not connected
120 Not connected
121 Not connected
