DTC 32

Code 32 Chart:

Code 32 Wiring Diagram:

CIRCUIT DESCRIPTION:

The digital EGR valve controls flow through two different size orifices which are normally held down by springs. The #1 orifice is the smaller one and the #2 orifice is the larger one. Independently controlled solenoids lift the pintles off the orifices when the ECM allows current to flow through the solenoids by creating ground paths through to separate quad drivers. Electrical circuit problems should result in a code 26 setting.

The ECM also test EGR flow by very quickly actuating the solenoid separately while the engine is idling under stable conditions. This test is done once per engine cycle, if the system passes.

This test should occur so quickly that it should not be noticeable to the driver.


TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. Code 26 indicates an electrical circuit problem is likely. This can be done using Code 26 chart.

2. This step actuates each solenoid separately and should result in a monumentally drop in RPM or engine roughness if the EGR flows at idle. The #2 solenoid should have more effect then #1 solenoid.


DIAGNOSTIC AIDS:

^ An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation.

^ Poor connections or damaged harness inspect the ECM and EGR wire harness connector for backed out terminal connectors or improper mating.

^ Intermittent test: If connections and harness check out OK, connect a digital volt ohmmeter from effective terminal to ground while moving related connectors and wiring harness. If the failure is induced the voltage reading will change.