DTC 53

Fig. 036 - WIRING DIAGRAM for Code 53 EGR Control Error. VIN N, VIN T:

CODE 53

EGR CONTROL ERROR

4.3L VIN "T"

5.7L VIN "N"

During normal operation, the ECM compares its EGR duty cycle signal with the MAP absolute pressure signal and makes corrections in the duty cycle accordingly. If the actual EGR control pressure (line vacuum) varies more than 8.11 KPA (2.4" HG) from what the ECM has previously determined the pressure should be and this variance continues for 10 seconds or more, a Code 53 will set and the ECM will shut down the EGR. The CEL will remain on and EGR off until the ignition switch is cycled off.

Fig. 035 - Chart For Code 53 EGR Control Error.:

1. Checks to see if adequate control signal vacuum is available to MAP Sensor.
2. Tests MAP sensor's ability to detect a variance in control signal vacuum and adjust voltage output accordingly to ECM.
3. Determines if EGR control error was detected and Code 53 set due to EGR Solenoid Malfunction or MAP Sensor problem.