Forum » EFI Wiring Fundamentals » Temperature Sensor Resistor Wiring

Temperature Sensor Resistor Wiring

EFI Wiring Fundamentals

Discussion and questions related to the course EFI Wiring Fundamentals

Page 1

What would be the proper way to wire a pull-up resistor for an analog temperature sensor? Seems like soldering it between two wires would not be a good idea.

A pull up resistor needs to have one end connected to the reference voltage (typically 5V). This connection could be via a crimped or soldered connection. The other end if the resistor needs to be spliced (again crimp or soldered) into one of the wires going to the thermoresistive temperature sensor. This same wire needs to be the signal wire connected to the ECU or data logger. The other wire to the temperature sensor needs to be connected to the ECU or data logger signal ground (0V).

For best results get a precision (1%) resistor of the required value. Typical 5% resistors can reduce the accuracy of your measurements (but you may be able to calibrate that out).