DTC 71

Code Chart 71:

EGR Valve Circuit:

CIRCUIT DESCRIPTION:

Code 71 indicates that the EGR Gas Temperature Sensor has signaled the ECM of a temperature above or below the calibrated range. The EGR temperature sensor is used by the ECM to detect one of the following:

^ EGR valve opened when not commanded by the ECM.
^ EGR valve did not open when commanded by the ECM.
^ EGR valve stuck in the opened postion.

The EGR temperature sensor is a thermistor whose resistance changes relative to temperature change in the EGR valve exhaust gas passage of the intake manifold.

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. The ECM should provide 4-5 volts to the EGR Gas Temperature Sensor.

2. The ECM provides ground for the EGR Gas Temperature Sensor.

3. Checks EGR temperature sensor resistance.