200SX L4-1998cc 2.0L DOHC MFI (SR20DE) (1995)
EGR Temperature Sensor: Description and Operation
EXHAUST GAS RECIRCULATION (EGR) TEMPERATURE SENSOR (DTC: P1401)
The EGR temperature sensor detects temperature changes in the EGR passage way. When the EGR valve opens, hot exhaust gases flow, and the
temperature in the passage way changes. The EGR temperature sensor is a thermistor that modifies a voltage signal sent from the Engine Control
Module (ECM). This modified signal then returns to the ECM as an input signal. As the temperature increases, EGR temperature sensor resistance
decreases. This sensor is not directly used to control the engine system.