1990 - 2003 Nissan R34 Skyline RB26DETT ECU

The ECU - Electronic Control Unit in the Nissan R34 Skyline GT-R (BNR34, 1999–2002) manages the RB26DETT engine via Nissan’s ECCS (Electronic Concentrated Control System), a sequential multi-point fuel injection and electronic ignition system. The RB26DETT is a 2.6 litre twin-cam twin-turbocharged inline-6 producing drive signals for six individual injectors and inputs from twin mass air flow sensors (one per bank). The R34 GT-R ECM integrates transmission control module (TCM) functions and uses an expanded terminal count compared to the earlier R32 and R33 GT-R units; pinout tables from those generations should not be assumed interchangeable with the BNR34. Diagnostics are accessed via the Nissan CONSULT serial interface, with CHK, IGN, RX, and TX signal lines exposed on the ECM face.

ECU - Electronic Control Unit Connector.

Notes

• The BNR34 GT-R was produced from 1999 to 2002; the page title date range (1990–2003) reflects the broader R32/R33/R34 GT-R lineage across which the RB26DETT was fitted.
• The R34 GT-R ECM differs from the general R34 workshop manual coverage (which addresses the RB20DE/RB25DE/RB25DET variants); the BNR34 RB26DETT wiring is documented in a separate R34 GT-R supplement.
• The dual mass air flow sensors (front bank and rear bank) are a distinguishing feature of the RB26DETT compared to single-MAF RB-series engines.
• Pin 34 label “(Front)” is incomplete in the documented pinout; full function is not publicly documented in available English-language sources.
• CONSULT diagnostic interface uses a 14-pin connector; ECM exposes CHK, IGN, RX, and TX lines to the data link connector.
• Power ground (pin 116) connects to the chassis; a separate sensor ground (pin 30) is provided to minimise noise on analogue signal lines.

Signals

• Tachometer Signal — engine speed output to the instrument cluster and ancillary devices
• Mass Air Flow Sensor Ground — dedicated ground reference for the MAF sensor circuit
• Engine Coolant Temperature Sensor — analogue input from the NTC thermistor in the coolant passage; used for fuelling and ignition correction
• O2 Sensor Signal (Front) — analogue voltage from the front (pre-catalyst) oxygen sensor for closed-loop fuelling trim
• Sensor Ground — common low-noise ground reference for analogue sensor inputs
• Mass Air Flow Sensor (Front) — analogue voltage input from the front bank hot-wire MAF sensor
• Intake Air Temperature Sensor — analogue input for air density correction; sensor is typically integrated with or mounted near the MAF housing
• Throttle Position Sensor — analogue voltage (approx. 0.5 V at idle, approx. 4.2 V at wide-open throttle) for load calculation and acceleration enrichment
• Vehicle Speed Sensor — pulse signal from the gearbox output shaft used for speed-dependent fuelling and CONSULT data logging
• O2 Sensor Signal (Rear) — analogue voltage from the rear (post-catalyst or rear bank) oxygen sensor
• Injector #1–#6 — individual injector drive signals; the ECM switches each injector low-side to ground in sequential firing order matched to the RB26DETT’s 1-2-3-4-5-6 firing sequence
• Power Ground (Chassis Ground) — main ECM power return to chassis earth

References

• Nissan Skyline R34 Service & Repair Workshop Manual, Model Years 1998–2002 (Chassis R34)
• Nissan R32 Engine Manual — CA18i, RB20E, RB20DE, RB20DET, RB25DE & RB26DETT
• Nissan Skyline R32 GTR Factory Workshop Manual, Model Years 1989–1994

Category:Car Connectors