The Nissan Bluebird U13 (1991–1997) was offered in selected markets, including Australia and New Zealand, with the SR20DET turbocharged 2.0 litre DOHC inline-four engine managed by Nissan’s ECCS (Electronic Concentrated Control System). The ECU provides sequential multi-point fuel injection and electronic ignition timing control via a multi-pin connector on the engine bay harness. The U13 SR20DET is a transverse front-wheel-drive application, which gives it a distinct harness and ECU connector layout compared to the rear-wheel-drive SR20DET fitted to the S13 Silvia and 180SX. Nissan published the factory service manual for this model in Japanese only; no official English-language edition is known to exist.
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 |
| 26 | Air Temperature Sensor | Analog |
| 32 | Vehicle Speed Sensor | Speed |
| 48 | Power Ground (Electronic Concentrated Control System) | Ground |
| 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 layout shown covers the documented signal positions only; pins not listed have unknown functions. The SR20DET in the U13 Bluebird uses a transverse FWD orientation, and its ECU harness connector differs from the longitudinal RWD SR20DET used in the S13/S14/S15 S-chassis — pinouts from those platforms should not be assumed to apply here.
Signals
- Tachometer Signal — engine speed output, used by instruments and ancillary systems
- Mass Air Flow Sensor — analogue voltage from the hot-wire MAF sensor; input to fuel calculation
- Mass Air Flow Sensor Ground — dedicated ground reference for the MAF sensor circuit
- Engine Coolant Temperature Sensor — NTC thermistor analogue input; used for warm-up enrichment and ignition timing correction
- O2 Sensor Signal — narrowband lambda sensor voltage; used for closed-loop fuelling trim
- Throttle Position Sensor — analogue voltage proportional to throttle plate angle
- Sensor Ground — common reference ground for analogue sensor inputs
- Air Temperature Sensor — intake air temperature analogue input; used for air-density correction
- Vehicle Speed Sensor — pulse signal from gearbox output; used for idle-up and fuel cut logic
- Power Ground (ECCS) — chassis power ground for the ECU’s main power stage (pin 48)
- Injector #1 — drive signal for cylinder 1 fuel injector
- Injector #3 — drive signal for cylinder 3 fuel injector
- Injector #2 — drive signal for cylinder 2 fuel injector
- Injector #4 — drive signal for cylinder 4 fuel injector
- Power Ground (ECCS) — chassis power ground for the ECU’s injector drive stage (pin 116)
References
- Nissan B13/N14 Official Factory Workshop Manual Vol. 1 — 100NX, NX1600, NX2000, Sunny, Sentra (GA16DE, SR20DE, SR20DET) — Nissan Motor Co., Ltd.; EC section for the transverse-FWD SR20 ECCS family shared with the Bluebird.