Re: Air in Fuel Filter Update. I fixed the truck a while ago but did not get around to posting.I took off the fuel filter lid and pressurised t[more ...] Posted by georg 27 Mar : 19:33
Re: freightliner mt45 brake lights I have ran into a couple of business class that the wiring going to the rear along the frame was the issue. The loom wil[more ...] Posted by Goodysnap 26 Mar : 07:54
Re: Emissions Tampering Goody, I have not and will not, for years perform any deletes etc. I have, in the past had units that have been "tampere[more ...] Posted by kmodel 26 Mar : 00:59
freightliner mt45 brake lights The brake lights on my truck have not been working lately. The turn signals work, and all the fuses and breakers seem to[more ...] Posted by upnorthplumber 25 Mar : 13:21
Emissions Tampering I found this article very informative, so I thought I'd share. Thoughts? What Policies or procedures do you have in plac[more ...] Posted by Goodysnap 25 Mar : 09:13
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I just had fault codes for high DPF outlet temp and unusual doser valve pressure. I monitored the temp during regen to 1077deg and the doser valve static was at 7lbs, and between 17.5 to 24.5 during regen. what is the spec for the fuel pressure the doser valve. the regen was sucessful. what else should I look for to log these codes thx.
hey popskull... do you have the codes so you can post them. I will post some Detroit regen information here in the next couple of days. There is a code that does come up and you are suppose to watch 2 pressures in the data monitor. If there is less that 35 psi differance you are to replace the fuel shut off valve. I will post details later.
Here is a code I see on 60S this code will most of the time be inactive. SPN 3556 FMI 1 When following the troubleshooting steps I make it step 7. - 2. and end up replacing the Doser Block Assembly. These step will have you watch Doser pressure and fuel compensation pressure. This somewhat applies to your question about fuel pressure but also applies to a unit that will not get up to temperature during a regen.
CHECK FOR REGEN TEMPERATURE OUT OF RANGE LOW Check as follows:
1. Visually inspect Doser Block Assembly and fuel lines for external fuel leaks. If fuel leaks found, repair as necessary. Refer to "18.104.22.168 Verify Repairs" . If no leaks found, go to step 2 . 2. Visually inspect exhaust system for leaks including ATD V-band clamps. If leaks found, repair as necessary. Refer to "22.214.171.124 Verify Repairs" . If OK, go to step 3 . 3. Disconnect DOC Outlet Temperature Sensor. See Figure "DOC Outlet Temperature Sensor" .
4. Check DOC Outlet Temperature Sensor resistance as listed in Table "ATD Temperature Sensor Resistance Chart" .
Temperature °C (°F)Resistance Ω 0 (32)202.50 25 (77)221.60 100 (212)277.90 600 (1112)619.80 850 (1562)768.81
a. If the resistance is out of specification replace DOC Outlet Temperature Sensor, refer to "3.1.2 TEMPERATURE SENSOR REMOVAL" , go to step 8 . b. If the resistance is within specification, go to step 5 .
5. Using DDDL 7.X, activate a parked regeneration. 6. Once the Fuel Cutoff Valve opens, monitor the Fuel Compensation Pressure. a. If the fuel pressure is greater than 660 kPa (95 psi), abort the regen and repair the cause of high fuel pressure (refer to your engine DDEC VI troubleshooting guide for high fuel pressure diagnostics). Once the high fuel pressure is resolved, go to step 8 . b. If Fuel Compensation Pressure is between 69 – 448 kPa (10 – 65 psi), perform a low fuel pressure test; refer to section listed in Table "Low Fuel Pressure Test References" . Make repairs as needed and go to step 8 . c. If fuel pressure is between 450 – 660 kPa (65 – 95 psi), go to step 7 . 7. Is Doser fuel line pressure within 35 kPa (5 psi) of the fuel compensation pressure? a. If yes, replace the Fuel Doser Valve and go to step 8 . b. If no, replace the Doser Block Assembly and go to step 8 . 8. Using DDDL 7.X, perform Doser Fuel Line Purge Service Routine. 9. Perform parked regeneration, refer to "5.3 Parked Regeneration" . After regeneration is complete, refer to "126.96.36.199 Verify Repairs" .
Thx... By the specs you listed I see that the fuel pressure was low. The same unit was seen just this week and the code still has not returned but I anticipate that it is teetering on the edge of failure and the information posted will save me wasted steps.
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