ECM check protocols
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ECM check protocols
So I replaced the fuel tank pressure sensor to clear evap trouble code, repair was successful. However, I have been driving the car (98 Buick Riviera) for weeks now and the system still reads not ready ( yellow light on engine analyzer) due to the EGR check test not having been run by the Onboard computer. Any ideas out there? Thanks
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So I replaced the fuel tank pressure sensor to clear evap trouble code, repair was successful. However, I have been driving the car (98 Buick Riviera) for weeks now and the system still reads not ready ( yellow light on engine analyzer) due to the EGR check test not having been run by the Onboard computer. Any ideas out there? Thanks
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From: Las Cruces, NM
If there is no codes stored, pending, or otherwise, this may be worth a look:
https://www.smogtips.com/smog-questi...tors-Not-Ready
If I remember right, it'* looking for a vacuum variance when it cracks the EGR open on deceleration.
https://www.smogtips.com/smog-questi...tors-Not-Ready
EGR Monitor (EGR):
Prerequisite: No trouble codes present, Engine Coolant Temperature (ECT) is above 75 Degrees (F); barometric pressure (BARO) above 72kPa.
1. Idle vehicle 5 minutes (achieve closed loop)
2. Accelerate and drive for 1 min at steady speed above 50 mph
3. Slow vehicle down to 20 mph. Do not use brake clutch, or shift gears.
4. Repeat steps two and three 5 times.
GM/Chevy/Pontiac run their EGR monitor during the deceleration portion of the drive cycle.
Prerequisite: No trouble codes present, Engine Coolant Temperature (ECT) is above 75 Degrees (F); barometric pressure (BARO) above 72kPa.
1. Idle vehicle 5 minutes (achieve closed loop)
2. Accelerate and drive for 1 min at steady speed above 50 mph
3. Slow vehicle down to 20 mph. Do not use brake clutch, or shift gears.
4. Repeat steps two and three 5 times.
GM/Chevy/Pontiac run their EGR monitor during the deceleration portion of the drive cycle.
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Also, if you haven't already cleared codes after fixing the previous problem, you should probably do that too, again, assuming there aren't any others hanging around in there
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Thanks for responding guys, I sure appreciate it. These procedures to instigate the computer systems check are just what I need. I was unaware this could be done. Always learning from you guys. I’ll give these procedures a go. I’ll let you know how it goes. ��
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