Nissan 200SX S14 SR20DET ECU Pinouts

The following diagram and pinout reference should help you work out what does what. Handy if your making a field harness or installing a programmable ECU. I’ve numbered and colour coded the pins in figure 1 for easy matching against the pinout table below.

Figure 1:

S14 SR20DET ECU Pinout Reference diagram

Pinout Table

Pin Wire Description
101 W/B Fuel Injector # 1 Drive Input
102 L/R EGR & Canister Control Solenoid Valve
103 G/B Fuel Injector # 3 Drive Input
104
105 R/Y Unknown
106
107 B Engine Ground
108 B Engine Ground
109 R ECU Power
110 Y/B Fuel Injector # 2 Drive Input
111
112 L/B Fuel Injector # 4 Drive Input
113 Y VTC Solenoid Valve
114
115 B Heated Oxygen Sensor Heater
116 B Engine Ground
1 R/W Power Transistor Coil Pack # 1
2 R/Y Power Transistor Coil Pack # 2
3
4 SB IACV-AAC Valve
5
6
7 L/B Tachometer Signal Output
8
9 G/Y A/C Relay (Triple Pressure Switch)
10 B Engine Ground
11 R/G Power Transistor Coil Pack # 3
12 R/L Power Transistor Coil Pack # 4
13
14
15
16 R/B ECU Relay (Self Shut-Off)
17
18 B/Y Fuel Pump Relay
19 O/L Cooling Fan Relay (Low)
20 B Engine Ground
21 G/B SCI RX (In)
22 G SCI TX (Out)
23 W Knock Sensor
24
25 O/B Wastegate Valve Control Solenoid Valve
26 B Mass Air Flow Sensor Ground
27 W Mass Air Flow Sensor
28 L/O Engine Coolant Temperature Sensor Input
29 W Heated Oxygen Sensor
30 B Engine Ground
31 G/W SCI CLK
32 O Malfunction Indicator Lamp
33 O/B Cooling Fan Relay (High)
34 PU/W Power Steering Oil Pressure Switch
35 W Boost Pressure Sensor
36 B Ground
37
38 W Throttle Position Sensor
39
40
41 W Camshaft Position Sensor (Reference Signal)
42 B Camshaft Position Sensor (Position Signal)
43 O/L Start Signal
44 G/O Neutral Position Switch
45 B/R Ignition Switch
46 R Thermistor Control Amplifier
47 G/R Check Connector
48 LG/R Throttle Position Sensor Power Output (AVCC boost)
49 B/W ECU Power
50 B ECU Ground
51 W Camshaft Position Sensor (Reference Signal)
52 B Camshaft Position Sensor (Position Signal)
53 Y/G Vehicle Speed Sensor
54 L/R Load Signal
55
56
57 B/W Unknown
58 R Power Supply (Back-Up)
59 B/W ECU Power
60 B ECU Ground

Links

Acknowledgements

The source for this information came from a spreadsheet I came across a while ago, I have checked the information here to the best of my ability against various sources on the internet. As a result I cannot guarantee that the information above is indisputable. The author of the original spreadsheet is unknown.

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