Powertrain Controls - ECM/PCM

DTC 76 Chart:

Digital EGR Circuit:

Circuit Description:
Exhaust Gas Recirculation (EGR) is administered through a digitally controlled 3 solenoid valve unit. Each of the 3 valves is controlled individually and can be open or closed in any combination. During a long closed throttle deceleration, the PCM will cycle each valve open and measure a change in MAP. This test indicates if the valve is nonoperational electrically, or if an EGR passage is obstructed. If the PCM does not detect a change in MAP associated with solenoid #2 being commanded "ON," a DTC 76 will be set.

DTC 76 Will Set When:
The engine speed is between 1400 and 2000 RPM, MAP is between 20 and 30 kPa, TP sensor angle is at 0%, all values must be held fairly constant for the test to run. The test must fail 3 consecutive times for a DTC 76 to be set.

Action Taken (PCM will default to):
The MIL will become illuminated.

DTC 76 Will Clear When:
The current DTC 76 will clear after each ignition key cycle, and will only reset when the test is run and fails again. A history DTC 76 will clear after 50 consecutive ignition key cycles without a current DTC 76 being stored.

Test Description: Number(s) below refer to circled number(s) 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 CKT 698 going to the EGR valve or if the PCM is at fault.

Diagnostic Aids:
An intermittent may be caused by a poor connection, chaffed wire insulation, or a wire broken inside the insulation. Intake plenum should be checked for possible plugged passages.