DTC 4-1-3 EGR Temperature Sensor Signal

4-1-3 EGR TEMPERATURE SENSOR SIGNAL

Preconditions for DTC
^ In order for the EGR diagnosis to be active, it is necessary that (a) the car is STARTED at an Engine Coolant Temperature (ECT) higher than -10°C (-14°F), (b) the car engine was switched OFF last time at an ECT higher than +8O°C (176°F), (c) battery voltage is above 12 Volts and (d) the Engine Coolant Temperature (ECT) sensor is undamaged. If the voltage across the EGR temperature sensor exceeds 4.4 Volts when the sensor is hot (high signal), is lower than 0.1 Volts when the sensor is cold (low signal) or varies considerably (faulty signal), the ECM interprets this as a fault and DTC 4-1-3 is set.

Substitute value
^ Long term fuel trim is inhibited.
^ Idle air trim is inhibited.
^ Only initial charge pressure is permitted.

Fault sources
^ Signal too high:
- Signal or ground lead short circuited to voltage supply.
- Break in signal or ground lead.
- Loose contact or contact resistance in connectors.
- Defective EGR temperature sensor.
- Flow fault in the EGR system.

^ Signal too low:
- Signal lead short circuited to ground.
- Defective EGR temperature sensor.

^ Faulty signal:
- Loose contact or contact resistance in connectors.
- Defective EGR temperature sensor.

Fault symptoms
^ Poorer performance from initial charge pressure limit.