DTC 32

DTC 32 EVRV (PCM):

EGR Circuit EVRV (PCM):

Circuit Description:
The PCM operates a solenoid to control the Exhaust Gas Recirculation (EGR) valve. This solenoid is normally closed. By providing a ground path, the PCM energizes the solenoid which then allows vacuum to pass to the EGR valve.

The PCM monitors EGR effectiveness by de-energizing the EGR control solenoid, thereby, shutting "OFF" vacuum to the EGR valve diaphragm. 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.

The PCM will check EGR operation 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 EGR command greater then then 93%.

- MAP above 47.5 kPa or less then 15 kPa.

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

1. With the ignition "ON", engine stopped, the solenoid should not be energized and vacuum should not pass to the EGR valve. Energizing the solenoid will allow vacuum to pass to the valve.

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

3. The vehicle must be driven during this test in order to produce sufficient engine load to operate the EGR. Lightly accelerating (approximately 1/4 throttle) will produce a large and stable enough reading to determine if the PCM is commanding the system ON."

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

Refer to "PCM Wiring Diagram" for coil terminal ID of solenoid(s) and relay(s) to be checked.

Replace any solenoid where resistance measures less than 20 ohms,

The EVRV solenoid cannot be diagnosed by a electrical test, because of the solid state circuitry involved.