EGR System Failure

FAULT ID
43

TITLE
EGR System

BACKGROUND
- The Exhaust Gas Recirculation (EGR) temperature sensor converts the EGR gas temperature to a voltage and outputs it.
- Engine control module checks whether an output voltage of the EGR temperature sensor is within a specified range.

RANGE OF CHECK
- Approx. 6 minutes or more have passed after engine was started.
- Intake-air temperature is 0 - 55°C (32 - 131°F).
- Barometric pressure is 93.3 kPa (27.6 in.Hg) or more.
- Engine speed is approx. 2,500 - 3,000 RPM's
- Vehicle is moving at constant speed on a flat, level road surface.
- The above conditions continue for a continuous period of 15 seconds.

SET CONDITIONS
- Sensor output voltage is approx. 3.5 V (corresponding to an EGR temperature of 70°C (158°F)) or more.
- When the range of check operation given above which accompany starting of the engine are carried out two times in succession, a problem is detected after each operation.

EFFECT
No Limp-in

PROBABLE CAUSES
- EGR valve does not open.
- EGR control vacuum is too low.
- EGR solenoid failed.
- EGR temperature sensor failed.
- Open or shorted EGR temperature sensor circuit, or loose connector.
- Engine control module failed.