DTC 32

DTC 32 Diagnostic Chart:

Exhaust Gas Recirculation (EGR) Circuit:

Circuit Description
The PCM operates the linear EGR valve to control exhaust gas recirculation, by providing a ground control that commands the pintle valve away from its seat allowing exhaust gas through the valve.

The PCM monitors EGR effectiveness by de-energizing the EGR control, thereby, shutting "OFF" the EGR valve. With the EGR valve closed, and 02S fluctuating normally, fuel integrator counts will be greater than they were during normal EGR operation. If the change is not within the calibrated window, after failing the test twice a DTC 32 will be set.

DTC 32 Will Set When
^ Throttle position between 10% and 25% angle steady throttle with no more then 2% change in throttle.
^ Above 32 mph "Closed Loop" operation.
^ Max short term fuel trim less then 6 counts for 3.2 seconds.
^ Desired EGH command greater then 40%.
^ MAP above 47.5 kPa or less than 15 kPa.

Action Taken (PCM will default to)
The PCM will turn "ON" the MIL (Malfunction Indicator Lamp).

DTC 32 Will Clear When
Conditions for fault are no longer present and Tech 1 "Clear DTCs" function is used or 50 ignition switch key cycles have passed with no further faults or ignition switch is turned "OFF" and fuse #9 (ECM B) fuse is removed for 10 seconds.

DTC Chart Test Description
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This step checks the pintle's ability to be commanded to the desired position.

2. This step checks for voltage to the linear EGR valve to verify if the problem is in the ignition feed circuit.

3. This checks the PCM control circuit by jumpering across the CKT 435 and CKT 439 with a test light and grounding the diagnostic connector to command the EGR "ON."

Diagnostic Aids
Before replacing PCM, use an ohmmeter and check the resistance of each PCM controlled relay and solenoid coil.

With J39200, check resistance of EGR pins.
A to E 9.5-10.5 ohms
B to D Above 3k
B to C From .7 to 4.0k when slowly moving pintle valve inward.