DTC 32

Code 32 - Exhaust Gas Recirculation (EGR) Circuit:

Wiring Diagram For Code 32 - Exhaust Gas Recirculation (EGR) Circuit:

CODE 32 - EXHAUST GAS RECIRCULATION (EGR) CIRCUIT


Circuit Description:

The ECM operates a regulator to control the Exhaust Gas Recirculation (EGR) valve. This regulator normally allows for only a small amount of vacuum to pass. By providing a ground path, the ECM energizes the regulator which then allows enough vacuum to pass to open the EGR valve.

The ECM monitors EGR effectiveness by de-energizing the EGR control regulator thereby reducing vacuum to the EGR valve diaphragm. With the EGR valve closed, fuel integrator counts will be greater than they were during normal EGR operation. If the change is not within the calibrated window, a Code 32 will be set.

The ECM will check EGR operation when:

^ Vehicle speed is above 80 km/h (50 mph)
^ Engine vacuum is between 12.5 and 55 kPa (1.8 and 7.4 psi)
^ Throttle position between 5 and 30%
^ All conditions met twice for 60 seconds



Test Description: Numbers below refer to circled numbers on the diagnostic chart.

1. With the ignition "ON," engine stopped, the regulator should not be energized and minimum vacuum should pass to the EGR valve. Grounding the diagnostic terminal will energize the regulator and allow vacuum to pass to valve.


2. Checks for plugged EGR passages. If passages are plugged, the engine may have severe detonation on acceleration.

NOTE: Vehicle speed must be greater than 2 mph for California vehicles.