Powertrain Controls - ECM/PCM

Code 32 Chart:

Digital EGR Wiring Circuit:

CIRCUIT DESCRIPTION:

The ECM is programed with an Exhaust Gas Recirculation Diagnostic Check to monitor flow through each individual valve in the three solenoid EGR valve.

When the vehicle is in the decel mode with the valves normally closed, the ECM opens each valve in succession and monitors the manifold pressure. It looks for an increase in manifold pressure associated with each valve's application. Should the calibrated response in manifold pressure not be seen by the ECM, a code 32 will be set.

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

1. This test determines if there is power to the EGR valve.

2. This test will determine if there is an open circuit in the EGR wiring or if the EGR valve is at fault.

3. This test will determine if there is a short to ground in any circuit going to the EGR valve or if the ECM is at fault.

DIAGNOSTIC AIDS:

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