3500 4x4 Pickup L6-359 5.9L DSL Turbo (1996)
Emissions Maintenance Light: Description and Operation
This Emission Maintenance Reminder System is incorporated into the engine controller. The controller stores vehicle mileage into its memory every 8
miles, then at 60,000, 82,500 or 120,000 miles it will illuminate the Emission Maintenance Reminder (EMR) lamp. When the indicated mileage is
reached or the EMR lamp is on at all times, the following parts must be replaced and the EMR lamp reset. After necessary emission maintenance has
been performed, connect Diagnosis Read-Out Box II (DRB II) to the on-board diagnosis connector. Follow instructions indicated by DRB II tool.
1. At 60,00 miles, proceed as follows:
a. Replace EGR valve.
b. Clean EGR passage.
c. Replace PCV valve.
2. At 82,500 miles, proceed as follows:
a. Replace oxygen sensor.
3. At 120,000 miles, proceed as follows:
a. Replace EGR valve.
b. Clean EGR passage.
c. Replace PCV valve.
CIRCUIT OPERATION
The Powertrain Control Module (PCM) provides ground for the Service Reminder Indicator (SRI) lamp on circuit G24. Circuit G24 connects to
cavity C18 of the PCM. Circuit F14 provides voltage for the lamp. The SRI lamp displays the message MAINTENANCE REQUIRED.
Power for the SRI lamp is supplied on circuit F14. Ground for the lamp is controlled by the Powertrain Control Module (PCM) on circuit G24.
This circuit connects to cavity C16 of the PCM connector.
