NOTOC The ECU - Electronic Control Unit is an embedded system that controls one or more of the electrical systems or subsystems in a vehicle.
2003 Infiniti G35 Sedan (Automatic Transmission) with Vehicle Serials Numbers (part of the VIN) of 000001 to 329287, excluding serial numbers 327918, 327920, 327976, 327978, 328979, 329004, 329025, 329078.
Built-in Sensors
Terminal
layout of the ECU harness.
| Terminal | Sensor Name | Wire Color | Voltage*’ Range*' | Conversion factors, Comments |
|---|---|---|---|---|
| 5 | RPM Signal - Ignition Coil Cyl #1 (RPM) | Yellow/Red | N/A | N/A* |
| 1 | Injector Duty Cycle (Dwell) - Inj. #1 (DWELL) | Red/Black | N/A* | N/A* |
| 66 | Intake air temperature sensor (IAT) | Yellow/Green | Approx. 0 - 4.8V |
234 ° F (112 ° C) = 0V -3 ° F (-19 ° C) = 5V |
| 83 | Throttle position sensor (TP) | White | 0.36-4.75V | -13% = 0V 122% = 5.0V ** |
| 93 | Engine coolant temperature Sensor (ECT) | Yellow/Black | 0-4.8V | 238 ° F (114 ° C) = 0V -5 ° F (-21 ° C) = 5V |
| 62 | Mass air flow sensor (MAF) | Light Green | 1.1-5V | N/N |
| 73 | Accelerator pedal position sensor (APP) | Brown | Approx. 0.41-3.2 |
-13% = 0V 122% = 5.0V ** |
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. Not needed. Voltage itself monitored for tuning purposes.
- Disconnect the negative battery terminal before unplugging the ECU connector. The ECU (ECM) can be found under the passenger-side glove compartment. After unplugging the connector, remove the black 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 that you want to use according to the terminal number and the wire color.
Automatic Transmission Sensors
Terminal
layout of the ECU harness.
| Terminal | Sensor Name | Wire Color | Voltage Range | Conversion factors for LogWorks |
|---|---|---|---|---|
| 8 | ATF Temp Sensor 1 | Black/Orange | 0-2.x | 32 ° F (0 ° C) = 2.2V 176 ° F (80 ° C) = 0.6V (normal operating temps 60-80 ° C) |
| 17 | ATF Temp Sensor 2 | Green/Red | 0-2.x | 32 ° F (0 ° C) = 2.2V 176 ° F (80 ° C) = 0.45V (normal operating temps 60-80 ° C) |
Notes
- Some useful temperature information can be found by tapping the TCM (Transmission Control Module) harness.
Additional Sensors
Terminal
layout of the ECU harness.
| Sensor | Name | Voltage Range |
| Fuel Pressure | Autometer fuel/oil pressure sending unit Part # ATM-2246 |
Aprox. 0-5V |
| Oil Pressure | Autometer fuel/oil pressure sending unit Part # ATM-2246 |
Aprox. 0-5V |
Notes
- Additional sensors can be purchased and installed to add to the stock sensor repertoire. These sensors must be of the 0-5V output.