Powertrain Controls - ECM/PCM

***This article was updated by TSB No. 51-65-49***

DTC 32 EGR Circuit Error:

EGR Circuit:

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) operates a solenoid to control the Exhaust Gas Recirculation (EGR) valve. This solenoid is normally open. By providing a ground path the PCM energizes the solenoid which then allows vacuum to pass to the EGR.
During normal operation, the PCM compares its desired EGR signal with the EGR pressure signal and makes corrections in the duty cycle accordingly. If there is a difference in the PCM command and what is at the EGR valved sensed by the EGR control pressure/BARO sensor, the PCM makes minor adjustments to correct.

DTC 32 WILL SET WHEN
^ RPM greater than 506.
^ No DTC 31 or 33 stored.
^ 50 kPa difference between desired EGR and EGR pressure for 25.5 seconds.

ACTION TAKEN (PCM will default to)
The PCM will shut down the EGR.

DTC 32 WILL CLEAR WHEN
The fault condition(s) no longer exist, and the ignition switch is cycled "OFF" then "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step determines if DTC 32 is a hard failure or an intermittent.
2. This step checks vacuum at idle.
3. This step checks the EGR valve.

DIAGNOSTIC AIDS
A vacuum leak or a pinched vacuum line may cause a DTC 32. Check all vacuum lines and components connected to the hoses for leaks or sharp bends. Check vacuum source to ERG solenoid.