Voltage Measurements
Vehicle sensors such as pressure or throttle position sensors report measurements as a voltage reading. A voltage reading can be used by several systems at once, for instance the TPS signal is shared between the ECU and Zeitronix systems. Both systems can tap into the sensor signal without affecting the signal reading.

Resistance Measurements
Air and Fluid temperature sensors work by physically changing resistance as the temperature changes. To measure this resistance and determine the temperature of the sensor internal power and an internal resistor are used within the engine management system. This technique is used when setting up a temperature sensor on the Zeitronix Zt-2 User2 input. For the Zt-2 Wideband these values are known and we can calculate the temperature of the sensor. The internal power and resistance of stock and aftermarket engine management systems vary and so calculating a temperature based off of a sensor shared between systems is not allowed. Each system must use its own sensor.

For more details on Zeitronix air and fluid temperature sensors please see our temperature sensor installation page.