The 1997–1998 Nissan Silvia S14 Kouki uses the SR20DET, a 2.0-litre DOHC turbocharged inline-four cylinder engine managed by Nissan’s ECCS (Electronic Concentrated Control System), which provides sequential multi-point fuel injection and electronically controlled ignition timing. The ECU connects to the engine harness via a multi-pin connector and communicates with the Nissan CONSULT serial diagnostic interface through a dedicated data link connector. The S14 Kouki represents the final revision of the S14 chassis produced from 1996 to 1998, sharing its engine management architecture with the broader SR20DET S-chassis family.
ECU - Electronic Control Unit Connector.
| Pin | name | Signal |
|---|---|---|
| 2 | Tachometer Signal | RPM |
| 16 | Mass Air Flow Sensor | Analog |
| 17 | Mass Air Flow Sensor Ground | Ground |
| 18 | Engine Coolant Temperature Sensor | Analog |
| 19 | O2 Sensor Signal | Analog |
| 20 | Throttle Position Sensor | Analog |
| 21 | Sensor Ground | Ground |
| 29 | Sensor Ground | Ground |
| 32 | Vehicle Speed Sensor | Speed |
| 101 | Injector # 1 | Speed |
| 103 | Injector # 3 | Speed |
| 110 | Injector # 2 | Speed |
| 112 | Injector # 4 | Speed |
| 116 | Power Ground (Electronic Concentrated Control System) | Ground |
Notes
The connector shown covers the S14 Kouki (1997–1998) SR20DET ECU. Only a subset of the full connector’s pins are documented here; remaining positions are not publicly documented for this revision. The S14 Kouki ECU differs in calibration from the S14 Zenki (1993–1996) unit, though the two share the same SR20DET engine family. Injector signal pins (101, 103, 110, 112) are listed with a “Speed” signal type in the source data — these drive the fuel injectors and the label reflects the source categorisation rather than a signal voltage type.
Signals
- Tachometer Signal — engine speed output (RPM) from the ECU to the instrument cluster
- Mass Air Flow Sensor — analogue voltage input from the MAF sensor measuring intake air volume
- Mass Air Flow Sensor Ground — dedicated ground reference for the MAF sensor circuit
- Engine Coolant Temperature Sensor — analogue input reporting coolant temperature to the ECU for fuelling correction
- O2 Sensor Signal — analogue input from the upstream oxygen sensor used for closed-loop fuel trim
- Throttle Position Sensor — analogue voltage input indicating throttle plate angle; at idle approximately 0.5 V, at full throttle approximately 4.2 V
- Sensor Ground (pins 21 and 29) — signal ground references shared by the analogue sensor inputs
- Vehicle Speed Sensor — pulse input from the vehicle speed sensor used for speed-dependent fuelling and idle control
- Injector #1 / #2 / #3 / #4 — sequential drive signals to the four fuel injectors (cylinders 1–4)
- Power Ground (Electronic Concentrated Control System) — main power ground for the ECCS control unit