2003 - 2005 Infiniti G35 Sedan and Coupe ECU

The Infiniti G35 (2003–2005) is the North American luxury variant of the Nissan Skyline V35, powered by the VQ35DE 3.5L V6 engine. Its Engine Control Module (ECM) is located behind the passenger-side instrument lower panel and connects via a 121-pin multi-row harness connector (terminals numbered 1–121). The ECM is OBD-II compliant and uses CONSULT-II diagnostics; it communicates with the TCM, BCM, combination meter, and VDC/TCS unit over a CAN bus. This page documents the later-build 2003 sedan (from VIN serial 329288, plus specific earlier serials), all 2004, 2004.5, and 2005 G35 Sedan and Coupe models, and the Nissan 350Z Coupe with both automatic and manual transmissions.

2003 Infiniti G35 Sedan (automatic transmission) with Vehicle Serial Numbers (part of the VIN) of 327918, 327920, 327976, 327978, 328979, 329004, 329025, 329078, and all serials from 329288. All 2003, 2004, 2004.5, and 2005 Infiniti G35 Sedan, Infiniti G35 Coupe, and Nissan 350Z Coupe models (automatic and manual transmissions).

Built-in Sensors

ECU - Electronic Control Unit Connector.

Notes

• * Not applicable. A built-in LMA-3 sensor used.
• ** TP and APP sensor values are approximate. Verify the raw voltage with the pedal depressed and released on your own car and use those voltage values for 100% and 0% TP/APP, respectively.
• Disconnect the negative battery terminal before unplugging the ECU connector. The ECM can be found behind the passenger-side instrument lower panel. After unplugging the connector, remove the locking lever by snapping it out of its anchors in the middle of the connector. Remove the outer harness collar that helps retain the wire bundle in place. Locate the appropriate wires for the desired sensors according to the terminal number and wire colour. A break-out box (SST) with Y-cable adapter is required for in-circuit terminal inspection.

Signals

• RPM Signal (pin 62) — engine speed signal from ignition coil cylinder #1; Yellow/Red wire.
• Injector Duty Cycle (pin 23) — injector #1 dwell control signal; Red/Black wire.
• IAT (pin 34) — intake air temperature sensor; Yellow/Green wire; 0–4.8V range (approximately 5V at -19 °C, 0V at 112 °C).
• TP (pin 50) — throttle position sensor; Green wire; 0.36–4.75V range.
• ECT (pin 73) — engine coolant temperature sensor; Brown/Yellow wire; 0–4.8V range (approximately 5V at -21 °C, 0V at 114 °C).
• MAF (pin 51) — mass air flow sensor; Light Green wire; 1.1–5V range.
• APP (pin 106) — accelerator pedal position sensor; Green/Orange wire; approximately 0.5–4.7V range.

For Nissan 350Z vehicles only

The 350Z is equipped with oil pressure gauges rather than low-pressure warning lights as on the G35. Accordingly, 350Z vehicles use a full oil pressure sensor with a 0–5V analogue output, rather than the simple pressure switch fitted to the G35. This signal may be tapped at the triple meter terminal (pin 8, Light Green/Red wire) together with a ground lead; see the table below.

Automatic Transmission Sensors

Notes

• Automatic transmission fluid temperature can be monitored by tapping the TCM (Transmission Control Module) harness connector.
• The ATF sensor data above applies to 2003 and 2004 G35 models (Sedans: VIN up to and including E*4M600000 & F*4M700000; Coupes: VIN up to and including 800000). For 2004.5+ G35 Sedan and 350Z models the TCM is integrated into the transmission housing itself; in that case ATF Temp Sensors 1 & 2 may be accessed at the sensor end of the harness at the transmission housing. Consult the factory service manual for vehicle-specific wiring diagrams.

Additional Sensors

Notes

• Additional aftermarket sensors may be installed to expand the stock sensor repertoire. These sensors must provide a 0–5V analogue output.

References

• 2003 Infiniti G35 Coupe Factory Service Manual — Section EC: Engine Control System
• 2003 Infiniti G35 Sedan Factory Service Manual — Section EC: Engine Control System

Category:Car Connectors