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I have a 2002 Ford F350SD Crew Cab 6.8L with 645K miles on it. I parked this truck back in 2018 due to going through a divorce and oil leaking from the pan bad enough to destroy the pivot bushings. At this point I have rebuilt the motor and am ready to put her back on the road. She runs PERFECTLY but I have been unable to get the O2 HTR and O2 Mon to complete their readiness so that I can have it inspected. At this point I have done the following:
Replaced O2 sensors with OEM
Tested voltage at connectors and back probed - 12 volt and 5 volt reference per specs at all connections
Ran drive cycle numerous times per Ford repair manual
Reset PCM by disconnecting battery and connecting jumper between positive and negative overnight until voltage read .000
All of the monitors say okay even upon initial start of truck after PCM clear (Should have cleared the KAM) except the O2 sensors. It seems as if the PCM is not resetting as it should. Anyone else ever encounter this? Any ideas?
I wanted to add a couple pictures of what my scanner says after I disconnected the battery and connected a jumper between positive and negative, cleared DTCs (none in system but did it anyway), which should have reset the I/M. I am starting to think the PCM is locked up somehow.
I'm thinking you've mis-identified it as OBDII when it is not.
If there's no downstream (post-cat) O2 sensor and no EGR, it's OBD1.
Mutually exclusive. OBD1 was ""Federal" or "US EPA", OBDII explicitly said "California" and "OBDII".
Okay. Let us say it is OBD I. It does have an EGR system though. I have used this scanner for years to determine if my system was ready for inspection, pull codes (Almost always a misfiring COP), and it has always told me that the readiness was complete and that included the O2 sensors. Any ideas what else I can check before I just replace the computer?
OBD1 (Federal) or OBDII (California) emissions? Check label on underside of hood.
I'd like to point out some misinformation about OBD. OBDI was the first generation of On-Board Diagnostics. The OBD port was specific to each manufacturer. The second generation of OBD (OBDII) was federally mandated in 1996 model year vehicles and required a single connector be used across all manufacturers, the OBDII connector. All vehicles produces now still use the same OBDII connector regardless of meeting 49 or 50 state emissions requirements. 50 state vehicles (California) have oxygen sensors before and after the catalytic converter to monitor the converter's performance. 49 state vehicles only have the upstream O2 sensors.
OBDI is only a relevant term for pre-1996 vehicles that have an emissions computer and a diagnostic port.
....snip...
OBDI is only a relevant term for pre-1996 vehicles that have an emissions computer and a diagnostic port.
It's the calibration (programming), not just the hardware... Download and read the OBDII Theory Manual from www.motorcraftservice.com. It explains the exceptions for certain vehicles that are rated over 8500 GVW including the F-Super Duty line.
It does have an EGR system though. I have used this scanner for years to determine if my system was ready for inspection,
Have you used it on THIS truck for that purpose?
Your tool displays "n/a" next to EGR... Are you sure it has EGR? If it's an OBDII (California) calibration, it will have BOTH EGR and a downstream O2 sensor.
Most decent scan tools should be able to identify whether OBD1 or OBDII.
It's the calibration (programming), not just the hardware... Download and read the OBDII Theory Manual from www.motorcraftservice.com. It explains the exceptions for certain vehicles that are rated over 8500 GVW including the F-Super Duty line.
Have you used it on THIS truck for that purpose?
Your tool displays "n/a" next to EGR... Are you sure it has EGR? If it's an OBDII (California) calibration, it will have BOTH EGR and a downstream O2 sensor.
Most decent scan tools should be able to identify whether OBD1 or OBDII.
I have used this scanner on this truck for many years. It has always done very well reading codes and readiness. The screen shots that I took are just the I/M readiness and I do not believe there is an actual monitor so to speak for the EGR system on this year model. In other words it definitely has an EGR system but nothing really gets tested in it as far as I can tell.
It turns out that my battery was on the edges of being bad. The voltage for the system had moments where it would drop below the needed 12 volts which caused the monitoring systems to stop testing. After replacing my battery I now have complete on everything and my readiness monitors shows as completed. I took the truck in, had it inspected, and it passed. After 4 years of delays, my truck is now safely, and legally, back on the road.
