During this episode after dealership verified turbo was good and fuel related, put in a Hino filter with same result.
The print out has a cover page with a header of "Troubleshooting report" then has VIN, Work date, Operator right below it and then Vehicle Information. This report was taken two days prior to episode during the PM. Do not know if they pulled codes when they received it this last time. Unsure how the PSI test done or tested.
DTC information: (order listed)
U1001
P0404
P1401
P0500
P0704
The Month, Day, Hours, Minutes columns on all the codes are 0, Year is 1985 on all. I'm not sure if this is a default setting. At work start and At the end of work are 0 for these columns.
Order of Freeze frame information:
P0404 EGR value 1 sticking (187 coolant temp, 1868 rpm, 54mph)
P1401 EGR value 2 sticking (183 coolant temp, 1706 rpm, 52mph)
P0500 Malfunction of speed sensor (Low)
Coolant temperature : 178
Engine revolution: 2211
Injection Quantity: 91.02 mm3/st
Final accelerator opening: 80
Speed: 0 mph (zero mph)
P0704 Malfunction of clutch switch
Coolant Temperature: 183
Engine revolution: 747
Injection quantity: 11.55
U1001 Malfunction of CAN communication (vehicle)
Engine coolant temperature: 129
Can I safely assume the listing order in the information portion is the order they occurred? For instance is the order the two EGR first then speed sensor, then clutch switch, then CAN?
Looking at the speed sensor rpm, only time the engine rpm would go that high in neutral would be during emissions testing in July. Jaw dropped when I saw a Maximum Revolution of 3936.5 rpm in the "Information of Protected Data" Arizona emissions does a "snap test" and get the opacity reading at the tailpipe. Although I'm guessing speed sensor fault wouldn't pick up speed while vehicle is moving.
The clutch switch fault, that was last summer also. Whenever the plastic tightening nut loosens up, the truck doesn't start, no start as turn key and only get dash. I would sometimes get it to start by activating the switch with my finger and truck in neutral. Have had this happen before and have had a new one in a box inside truck for three years. I originally, three years ago, was going to remove the "old" one and noticed this. After securing it in place, the truck not starting went away.
There are no P0087/P0088 codes stored. Unsure if there is a maximum amount of codes stored though as I already have five. Again, I don't know if they pulled a dx report this episode. It's something I'll need to find out.
Initially when the episode happened I was thinking something with the turbocharger not making boost. But was no black smoke at all. It was whiteish blue close to grey. Didn't see a P0045 or U0073 listed. Dealership mentioned it was not the turbo. Turbo related info from report is Air flow sensor characteristic value = 1 and Meter correction coefficient = 1
The radiators collect an impressive amount of crap in the fins that remain completely concealed unless the intercooler is removed.
The fan clutch has to work properly. You will hear it roar when it comes on. If you don't, replace it. If the belt chirps, replace the belt and tensioner at the same time.
If fan clutch works, belt doesn't slip, thermostat opens correctly, radiator fins cleaned, no evidence of combustion gas in cooling system, abd it still overheats, replace radiator.
Quite the concise trouble shooting flow chart of sorts. THANK YOU SO MUCH!
This is something I'll have to double check myself if new life is breathed into the truck. Stored values of number of overruns and overheat are zero, Max coolant temp 228, Max fuel temp 180. A thought to something you had posted a while back about headgasket and #6 cylinder.
Could this be something of a function of:
-How the coolant flows through the head and warms up, warmer at back than front
-Residual heat generated by turbo elbow transferring to exhaust manifold #5 and #6 runners thus keeping back cylinders marginally warmer than front.
Homework:
-Get scv test done and pass on results
-Get current dx report
-Stalk Greasytshirt, find out Virgina shop location, this man needs some free lunches. So much information and assistance freely given. Saved people lots of money, downtime, parts, headaches and headache relief.