Nissan 200SX S13 CA18DET 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:

CA18DET ECU Pinout reference diagram

Pinout Table

PinWireDescriptionRelated Pins
101W/BFuel Injector #1 Drive Input?
102???
103G/BFuel Injector #3 Drive Input?
104SBAuxiliary Air Control Valve?
105???
106???
107BInjector Ground10, 20, 108, 116
108BInjector Ground10, 20, 107, 116
109B/WECU Power49, 59
110Y/BFuel Injector #2 Drive Input?
111PUPressure Regulator Control Solenoid Valve?
112L/BFuel Injector #4 Drive Input?
113???
114???
115LExhaust Gas Sensor (Oxygen Sensor)?
116BInjector Ground10, 20, 107, 108
1R/WPower Transistor Coil Pack #1?
2R/YPower Transistor Coil Pack #2?
3R/GPower Transistor Coil Pack #3?
4???
5L/GBoost Pressure Control Solenoid?
6G/YA/C Relay?
7Y/RTachometer Signal Output?
8GyVariable Intake Butterfly Control Solenoid?
9???
10BEngine Ground20, 107, 108, 116
11R/LPower Transistor Coil Pack #4?
12???
13???
14???
15???
16R/BECU Relay?
17Gy/RInjector Pulse Duty Output (Trip Computer For Fuel Usage Meas.)?
18B/PFuel Pump Relay?
19???
20BEngine Ground10, 107, 108, 116
21???
22???
23WDetonation Knock Sensor?
24???
25???
26BAir Flow Meter Ground?
27G/BAir Flow Meter?
28L/OEngine Coolant Temperature Sensor Input?
29WExhaust Gas Sensor (Oxygen Sensor)?
30BEngine Ground?
31???
32RCheck Engine Light (MIL) Check Connector?
33GCheck Connector?
34???
35???
36???
37G/YAir Flow Meter?
38Lg/BThrottle Position Sensor?
39???
40???
41G/YCrank Angle Sensor51
42G/BCrank Angle (Sensor 1 Degree Signal)52
43OStart Signal?
44G/ONeutral Position Switch?
45B/RIgnition Switch?
46L/GA/C ON Switch?
47GY/LCheck Connector?
48Lg/RThrottle Position Sensor Power Output?
49B/WECU Power59, 109
50BECU Ground60
51G/YCrank Angle Sensor 180 Degree Input41
52G/BCrank Angle (Sensor 1 Degree Input)42
53Y/GVehicle Speed Sensor?
54Y/WAutomatic Control Unit TPS, Throttle Idle Position?
55L/WAmbient Air Temp Sensor Input?
56W/LAutomatic Control Unit?
57YIdle Switch, TPS Switch, Full Throttle Position?
58RDropping Resistor/ Power Transistor?
59B/WECU Power49, 109
60BECU Ground50

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Acknowledgements

The source for this information came from a spreadsheet I came across a while ago and has been checked against an Autodata Nissan workshop supplement. The author of the original spreadsheet is unknown.

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