ECM check protocols
02-02-2019, 02:28 PM
#1
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
02-02-2019, 03:03 PM
#2
Senior Member
True Car Nut
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
02-02-2019, 08:18 PM
#3
Senior Member
True Car Nut
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.
The following users liked this post:
2oldsnbuick (02-03-2019)
02-02-2019, 08:31 PM
#5
Senior Member
True Car Nut
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
02-03-2019, 03:34 AM
#6
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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