Peterbilt derate in 3 hours

Keep your wheels going & your cash flowing. The plug-and-play tool gives you the power to run commands, including a forced DPF regen, in less than 5 minutes. Select Engine Reset Fault Codes Reset first-time ‘Ghost’ Codes to find the problem faster. Reset Aftertreatment Ability to get out of 5mph derate within 3 min

Cummins ISX 15 550 hp on a Peterbilt(###) ###-####Showing fault codes: SPN 641 FMI 9 SPN 77 FMI 3 Derate in 3 hours. Truck was parked off for 4 days, first showing code out of nowhere was the SPN 641 … read moreThe truck is showing derate in 3 hours when the key is turned on. ... Got a 2018 Peterbilt 389 with the X15 Efficiency showing code 3464 fmi 3 and fmi 7.I was 1 hour away to S&R and my engine is going to derate in 3 hours. If you are on here to bash the T680 or talk about how a glider, old pre emmision engine or any of the other old... 2 bedroom apartments for rent in canarsie Engine derate in 3 hours peterbilt Add DEF fluid (more than 1/4 tank).As a result the truck sees no def in the tank (it was at 3/4 when I got home and even added 2.5gals from Walmart to make sure it wasn't empty) and goes into maximum derate in limp home mode. Throws out a long list of U#### errors all saying "timeout - from aftertreatment system".U116F00, FMI 0. U010E00, FMI 0 It says it’s in derate to 5 mph and the DEF tank gauge is reading E. Technician: Mike Mcmillan. Okay. On your batteries there will be a single fuse holder. Please make sure that the fuse is good, clean and secure.

Web web engine derate in 3 hours peterbilt 579. Web peterbilt 579 engine light clearing procedure. Web i have a 2017 peterbilt 579 with a paccar mx13 engine and getting …"We all have the same 24 hours in a day." That's what her caption read. And she's right. It's what we do we that time and those hours that define... Edit Your Post Published by jthreeNMe on September 9, 2020 "We all...While driving the warning for engine derate came on with -3 hours left and to seek service immediately. ... Cummins ISX 15 550 hp on a Peterbilt(###) ###-####Showing fault codes: SPN 641 FMI 9 SPN 77 FMI 3 Derate in 3 hours. Truck was parked off for 4 …Reset Tool: https://otrperformance.com/collections_____OTR Performance is the destination for videos of how to's, diagnostics, a...Derates typically last for one hour, but can be extended if necessary. Kenworth Engine Derate 3 Hours . If you’ve ever wondered what a Kenworth engine derate is, or why it happens, this blog post is for you. We’ll explain what a Kenworth engine derate is, how it affects your truck’s performance, and some tips on avoiding it.Peak sun-hours is equal to the number of hours the . insolation value is at 1,000W/m2. For example, a geographic region with a PSH of 3.5 is interpreted as solar insolation reaches 1,000W/m2 for of 3. 5 hours per day. This PSH value is generally higher in the southern part of the United States, including Arizona. The amount of peak sun-hours ...Jun 8, 2023 · Cummins ISX 15 550 hp on a Peterbilt (###) ###-####Showing fault codes: SPN 641 FMI 9 SPN 77 FMI 3 Derate in 3 was parked off for 4 days, first showing code out of nowhere was the SPN 641 read nworth Forum > Engine derate in 3 hrs, seek service immediately!... It'll be here in a few hours for me to chase ghosts again.

Jan 27, 2019 · The truck has an aftertreatment scr fault code. If it gets to the final countdown on the fault it will get into a 5 mph derate. There is a lot of faults that are linked with the scr, dpf, and def system that can cause this. Without knowing the fault codes in the unit its hard to say exactly what is causing the issue. The derate is due to the nox sensor f/c. Any aftertreatmemt related f/c will cause a derate in these engines. That fault is an information only fault code and will clear …Ambient temperature has a significant effect on an engine’s output. As the ambient temperature increases beyond designed operating conditions, engine derating begins, decreasing its efficiency. For example, if an engine is designed to operate at 30°C, and the ambient temperature reaches 40°C, the engines can experience a reduction in power ...I’m working on a 2016 Peterbuilt 579. The driver went to go on a night run and the truck is full derate, Def light flashing. Codes say def Quality and fuel filter restriction. The Def quality harness has not been connected and is capped. I’m assuming because it’s a different Def pump but I maybe wrong.Nov 21, 2022 · An error that states "engine derate in 3 hours" is most likely associated with a treatment aftermath system failure. Generally, this warning signals a problem linked with a NOx sensor, aftertreatment heat sensor, a problem with the DPF or SCR a DEF issue.

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Apr 21, 2014 · tin714 said: ↑. I have 2010 Cascadia and 2 yellow check engine light came on and my engine is derated. ECU 128. Can anybody help me..thank. ECU 128 is telling you that there is a failure of the engine. There are more numbers than this, to isolate it to specific sensors. Powder Joints, Apr 21, 2014. #2 + Quote Reply. Apr 21, 2014 #3. In Peterbilt’s a flashing def gauge light means a lot of things. When the def is full and the light is on it indicates a fault in the after treatment. Which there are about 250 faults that turn that light on last time I checked. There …I'm working on a 2015 pete pb348 with paccar px-9! I have 2. I'm working on a 2015 pete pb348 with paccar px-9 ! I have 2 codes 3712 and 3714 ! I know these are both information only . I have no other codes ! ... Left the shop, and derate warning appeared again. 3 hours to derate. ...Hold down the regen button and keep holding the button down for at least 10 seconds. The engine RPM’s will start to increase from IDLE to a higher RPM. Remember, do not cancel the regen. Do not press brake pedal, clutch, park brake. A parked regen will take from 10 minutes up to 1 hour to complete.Re: CUMMINS FAULT 4769 VIN KZ0866 Apr 3, 2019 7:26 PM Cummins fault code 4769 DEF tank level sensor abnormal update rate "If ECM calibration revision is up to date, have to fill tank up and leave KOEO for 2 hours." I think that derate and emmissions codes need special attention. This is actually also quoted in the Conditions for Clearing

Engine Reaction Derate 25% , 30 seconds shut down. Verification SCR Efficiency Test Check as follows: 1. Connect DiagnosticLink ®. 2. Turn the ignition ON (key ON, engine OFF). 3. Check for multiple fault codes. Are fault codes SPN 4363/FMI 3 or 4 also present? a. Yes; diagnose the other fault codes first. b. No; Go to step 4. 4.Engine derate can be caused by a number of specific faults, most of which relate to a truck’s emissions system. Some of the most common of these issues include DEF quality and DPF/SCR catalyst efficiency faults. In general, faults of this type impede upon a truck’s ability to successfully complete its automatic regeneration cycle.2021 Peterbilt with a Cummins engine, emission derate was coming up on the display. Once we connected to the truck using our Insite software we were able to ...Jan 23, 2019 · Peterbilt 2014 cummings. Nada. Def tank is full and shows alarm ding noise empty - Answered by a verified Technician ... I have a 2013 freightliner with a DD15 engine ... We have a 2020 pete 389 that is showing 4 hour to derate service def system. 2020 peterbilt 389. ***** - Answered by a verified TechnicianPlease select the number of verifiable months you’ve been driving professionally using your Class A CDL within the last 3 years. Please Select... None 1-5 Months 6-11 Months 1 Year 2+ Years2015 cummin isx 485 hp codes fmi 18, fmi 3? JA: What's the make/model/year of your truck? Engine type? Customer: 2015 kenworth t660 cummins isx 15 485horsepower JA: Are you fixing your truck yourself? … read moreMar 1, 2019 · 2013 kw t660 with a paccar mx13 epa 10 motor fault codes are spn 1569 fmi 11. All i get from the truck is engine derated. Only running 75% of torque. Last week it blew the relay to the ECU and a wheel speed sensor, this derate issue just happened today. Any clue on them codes would be a great help. Nich1019. Cummins/Caterpillar Techni... Vocational, Technical or Tra... 6,149 satisfied customers. 2019 Kenworth t880 mx13 stop engine immediately only fault. 2019 Kenworth t880 mx13 stop engine immediately only fault code i get is p1514 I am currently doing a forest region to see if that helps … read more. Nich1019.operating properly. An ‘inducement’ may also be referred to as an engine derate There are three primary events that could initiate an inducement/derate: (1) Low Diesel Exhaust Fluid (DEF) level, (2) Incorrect fluid in DEF tank, and (3) SCR Faults. The driver will recognize this as a performance penalty initiated by the Sep 25, 2023 · Tap to 6, 2022 · Engine derate in 3 hours. Engine Derate In 3 Hours Peterbilt 579. DATA SHEET: creased derate in 4 hours kenworth t680 increased derate in 4 hours kenworth t680. 9L - 450 HP Automatic Transmission Air Ride Suspension 12 FA, 40 RA, 218 WB Aluminum Wheels 275/80R22. PetSmart, Mid-City West.

After one hour a 25% derate will be applied for four hours unless the issue is resolved. In that case, engine power will be immediately restored. If the issue is not resolved 5 hours after the check engine light illuminates a 40% power derate will be ramped in until the ECM determines it is safe to limit the truck to 5 mph.

The derate is due to the nox sensor f/c. Any aftertreatmemt related f/c will cause a derate in these engines. That fault is an information only fault code and will clear …I’m working on a 2016 Peterbuilt 579. The driver went to go on a night run and the truck is full derate, Def light flashing. Codes say def Quality and fuel filter restriction. The Def quality harness has not been connected and is capped. I’m assuming because it’s a different Def pump but I maybe wrong.Ambient temperature has a significant effect on an engine’s output. As the ambient temperature increases beyond designed operating conditions, engine derating begins, decreasing its efficiency. For example, if an engine is designed to operate at 30°C, and the ambient temperature reaches 40°C, the engines can experience a reduction in …Nauticstar owners manual Level 1 engine derate kenworth t680. Petsmart - Allentown 2180 MacArthur Rd, Allentown, PA 18052. On... 60 days in season 4 participants 25 de set. Increased derate in 4 hours; Engine derate in 3 hours of operation; Engine will derate in 3 hours; Engine derate in 3 hours peterbilt; Engine derate in 3 hours a dayIn this edition of Peterbilt Atlantic Tech Tips, Shawn Warman discusses the importance of the DPF & SCR systems.Visit Peterbilt Atlantic online: http://www.p...Mar 14, 2020 · 1997 peterbilt n14 celeste plus. 1997 peterbilt cummins n14 Chasing a problem for several years. Seems to me when I have an injector starting to miss the ecm will derate engine power.im not sure if this is a derate or just a power loss. This will be an after treatment or scr issue with the derate that you are experiencing. This could be something as small as a sensor, or a software update. I would make sure clean def has been used in this, Make sure there is not black soot coming out of the ex pipe and that the engine is running okay. I hope this helps you on the right path.Peterbilt’s engine derate time is three hours. Engine Derate In 3 Hours Peterbilt . An engine derate in a Peterbilt semi-truck can happen in just three hours. In this case, the ECU (engine control unit) will reduce engine power and torque, as well as reduce fuel efficiency, to ensure engine longevity and safety. ...

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Vehicle Make Peterbilt Model Model Year 367 2012 VIN 1XPTD40X2CD146501 ... Total Avg Fuel Econ 4.60 mpg Total Engine Hrs 9,541.50 hrs Road Speed Limit 68.00 mph Cruise Spd Limit 72.00 mph DPF Soot Level Low Engine Derate No Derate Malfunction Indicator Lamp Off Red Stop Lamp OffHey guys we in Wyoming and we have trouble with the W900. This may be serious.Today, workers are putting in increasingly more hours—so much so that the 40-hour week has become a relic of the past. But pushing employees to clock up those extra hours is bad for their well-being and detrimental to your company. Today, w...Peterbilt websites. Or, stop in at one of the nearly 600 Kenworth and Peterbilt dealership locations found throughout the U.S. and Canada. The PACCAR Emissions Solution Safe. Efficient. Reliable. And good for the Environment. PACCAR Engine Manufacturing Facility Parts Distribution Centers Kenworth & Peterbilt Sales & Service Distribution LocationsReset Tool: https://otrperformance.com/collections_____OTR Performance is the destination for videos of how to's, diagnostics, a...FMI - 3 = Voltage above normal, or shorted to high source In this instance breaking down the code may help explain what's happening behind the scenes and identify the problem. ... 235 Engine Total Idle Hours 236 Engine Total Idle Fuel Used 237 Vehicle Identification Number 238 Velocity Vector 241 Tire Pressure 242 Tire Temperature 244 Trip DistanceMike Mcmillan. Shop Foreman/Triage Tech. Associates. 7,753 satisfied customers. Cummins ISX 15 550 hp on a PeterbiltShowing fault codes: SPN. Cummins ISX 15 550 hp on a Peterbilt (###) ###-####Showing fault codes: SPN 641 FMI 9 SPN 77 FMI 3 Derate in 3 hours. Truck … read more.May 2, 2020 · Left truck running over night (was -30f), started driving in morning and started getting Engine derate in 1 hr, Power reduced due to SCR, and SCR fault detected or altered. Did a 1 hour manual regen, but codes kept showing. Had to do a load and all throughout the day I kept getting those codes, with the derate in 59minutes reseting as I was ... **3. The check engine light (yellow) starts with a 20 percent derate (reduction in horsepower output), then moves up to 40 percent, which if you hadn’t noticed the 20 percent, you will most ...Jun 9, 2020 · Ambient temperature has a significant effect on an engine’s output. As the ambient temperature increases beyond designed operating conditions, engine derating begins, decreasing its efficiency. For example, if an engine is designed to operate at 30°C, and the ambient temperature reaches 40°C, the engines can experience a reduction in power ... ….

Answered in 15 hours by: 5/16/2020. ... This will be an after treatment or scr issue with the derate that you are experiencing. This could be something as small as a sensor, or a software update. ... 2016Freightliner cascadia evolution amber check engine light stays on with 3 fault codes involving DEF: 1) Poor DEF quality. Check DEF. Diagnotic ...As the tach crosses 2000, in the normal case you get a big surge of power as the boost comes on and you can see the tach needle accelerate. When it's derated, the tach just climbs through 2000 and higher at a steady pace and your acceleration doesn't really change. 2012 SLT 3500 CCLB 4x4 SRW G56/3.73. Reply.2019 Peterbilt 389 Cummins X15. On the dash shows " Engine derate 40% in 3 hrs. Codes 3364,3031 7323 6780. Mechanic's Assistant: The Mechanic will know how to help. Anything else you want them to know before I connect you? DEF gauge shows empty ,but thank is full ,otherwise is running OK Engine derate can be caused by a number of specific faults, most of which relate to a truck’s emissions system. Some of the most common of these issues include DEF quality and DPF/SCR catalyst efficiency faults. In general, faults of this type impede upon a truck’s ability to successfully complete its automatic regeneration cycle.The truck is showing derate in 3 hours when the key is turned on. ... Got a 2018 Peterbilt 389 with the X15 Efficiency showing code 3464 fmi 3 and fmi 7.Dash shows, SCR System Fault, Engine will Derate in <60 mins.. please help me.. Dealer says they cant take me in til Monday. AlexD13, Aug 6, 2016. AlexD13, Aug 6, 2016 #1 + Quote Reply. Trucking Jobs in 30 seconds. Every month 400 people find a job with the help of TruckersReport.Have in our shop a 2017 Peterbilt 389 with a Paccar MX13 in it. Have 2 codes a P1496 and. P1515, can anyone help with these. Also truck is in derate and we have checked to see if egr is carbonned up. … read moreI do have 2016 kenworth t680 cummins isx15. . what does engine derate in 3 hours mean I was told it had a code of (SPN:5246 FMI:16)(SCR system fault detected - Warning fault - Engine derate) at one time which i understand to be a derate to 55mph with a SCR issue. examples of artifice in real life Sep 6, 2022 · Engine derate in 3 hours.Feb 25, 2021 · Cummins ISX 15 550 hp on a Peterbilt(###) ###-####Showing fault codes: SPN 641 FMI 9 SPN 77 FMI 3 Derate in 3 hours. Truck was parked off for 4 days, first showing code out of nowhere was the SPN 641 … read more Peterbilt derate in 3 hours, In Peterbilt’s a flashing def gauge light means a lot of things. When the def is full and the light is on it indicates a fault in the after treatment. Which there are about 250 faults that turn that light on last time I checked. There …, Derate Codes are Present. One common cause for a DPF regen failing is an active derate code. On many vehicles, y ou can NOT run a regen when a derate code is active. Look carefully at what fault codes your diagnostic tool is showing. The ECMs on commercial truck engines will set a code that specifically states the vehicle is derated., Web inducement from an engine power (torque) derate to a vehicle speed derate you will need to obtain a new engine dataplate signifying that the engine is designed for use in …, Mr. Emmer, 62, is the highest-ranking Republican in the race. Endorsed by Mr. McCarthy, Mr. Emmer is the No. 3 Republican in the House, whose job is to “whip,” …, Subject: CATGUY - C15 problems. Northeast Nebraska. Catguy, we've got a 2005 379 Pete. Yesterday drove it 280 miles one way to pick up a sprayer. On the way there, empty, the water temp light came on randomly 3 times, and stayed on for various times, less than a minute each time it came on. The check engine light came on with the …, In the screen say: Engine derate in 3hrs,i found 2 different code:2374;2554,also i tryed - Answered by a verified Technician We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them., F. funacres Discussion starter. 7 posts · Joined 2005. #1 · Aug 11, 2005. Today my truck left me on the shoulder driving 8-10 MPH. It won't rev past 1,500 and then only at half throttle. When I am running 1,500 rpm and mash it, the engine drops to a constant 1,000 rpm. I have to let it idle and then ease into it again to get it up to 1,500 again., The Customer Call Center is open 24 hours per day, 365 days per year, and is staffed with trained ... The limited performance mode telltale will illuminate when severe derating is occurring on the ... 24 hours a day 1.800.4.PETERBILT . Pr inted in the U .S.A. Y5 3-6 18 6-1A 1 (09 /20 22), Sep 8, 2023 · 2015 Peterbilt 579 ISX 15 Using very little DEF 4658 code. Dash said “Increased Derate in 4 Hours” for 10 minutes then - Answered by a verified Technician We use cookies to give you the best possible experience on our website. , It says engine derate in four hours. 2014 Peterbilt 13 speed Cummings will not go past 1200 rpm. Def light is on. Tried - Answered by a verified Technician, Southwest Church Of The Nazarene - Engine Derate In 3 Hours Peterbilt 579. June 7, 2023 Come and experience The Scribe! About Southwest Church Of Nazarene. We do not ..., Seeing codes spn-5298 fmi 18 and spn-3246 fmi 25. While driving the warning for engine derate came on with -3 hours left and to seek service immediately. I called the dealer where we bought the truck … read more, I’m working on a 2016 Peterbuilt 579. The driver went to go on a night run and the truck is full derate, Def light flashing. Codes say def Quality and fuel filter restriction. The Def quality harness has not been connected and is capped. I’m assuming because it’s a different Def pump but I maybe wrong., MX 13 EPA 13 Emission control system - Engine torque derate active P1518 FMI N/A Count 49. From what I've found so far P1496, P1515 and P1518 are triggered by some other codes and latch after 10 hours. I don't have DAVIE to reset them. I can't find anything on SPN 5246 though., tin714 said: ↑. I have 2010 Cascadia and 2 yellow check engine light came on and my engine is derated. ECU 128. Can anybody help me..thank. ECU 128 is telling you that there is a failure of the engine. There are more numbers than this, to isolate it to specific sensors. Powder Joints, Apr 21, 2014. #2 + Quote Reply. Apr 21, 2014 #3., Truck will derate in 3 hours, my engine light came on for the first time, trucker life.This your first time to my channel..thank you., Web 5 mph def derate explainer: It has not actually derated. Source: www.youtube.com Check Details. Web the driver display says 25% torque derate in 3 hours. It is a semi tractor. Source: www.reddit.com Check Details. Web subscribe 7.8k views 2 years ago truck will derate in 3 hours, my engine light. I have had a 2013 pete with an isx15 cm2350 ..., Follow the lines from the def tank to the dosing PUMP. it has 3 bolts and 3 lines takes 2 min to change. ... Vehicle speed will be limited to 8 km [5 mi] per hour. Conditions For Clearing The Fault Code ... This fault code is for information only, and indicates that an engine power derate and vehicle speed limit have been implemented in …, Mr. Emmer, 62, is the highest-ranking Republican in the race. Endorsed by Mr. McCarthy, Mr. Emmer is the No. 3 Republican in the House, whose job is to “whip,” …, Engine Derate In 3 Hours Peterbilt 579. ... Derate in 3 hours kenworth t680. 5 5 from 24 reviews 4642 Lebanon Pike Nashville TN 37076 (615) 883-2726 Claim this business (615) 883-2726 Website More Order Online Directions Advertisement PetSmart is the world's largest pet supply and service retailer, offering over 10, 000 products in each store ..., In the screen say: Engine derate in 3hrs,i found 2 different code:2374;2554,also i tryed - Answered by a verified Technician We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them., 3. 4. Solid Diesel Exhaust Fluid (DEF) Lamp DEF level is low. Solid DEF Lamp and Check Engine Lamp Indicates lower DEF level, incorrect DEF type or an SCR system issue. Driver will experience a mild loss of engine power. If the vehicle has a DPF Switch and the DPF Lamp is flashing: 1. Park vehicle, and set up a safe exhaust area., Peterbilt’s engine derate time is three hours. Engine Derate In 3 Hours Peterbilt . An engine derate in a Peterbilt semi-truck can happen in just three hours. In this case, the ECU (engine control unit) will reduce engine power and torque, as well as reduce fuel efficiency, to ensure engine longevity and safety., A NOx sensor is placed in exhaust systems to observe nitrogen oxide (NOx) levels in the exhaust. On most systems, there are usually two NOx sensors. There is one right after the exhaust manifold and the second after the selective catalytic reduction (SCR) system to monitor SCR efficiency. Based on the readings collected by the ECU, it commands ..., Answered in 15 hours by: 5/16/2020. ... This will be an after treatment or scr issue with the derate that you are experiencing. This could be something as small as a sensor, or a software update. ... 2016Freightliner cascadia evolution amber check engine light stays on with 3 fault codes involving DEF: 1) Poor DEF quality. Check DEF. Diagnotic ..., More specifically when the derate is 5 mph you can be sure. Web the driver display says 25% torque derate in 3 hours. It has not actually derated. Web Subscribe 7.8K Views 2 Years Ago Truck Will Derate In 3 Hours, My Engine Light Came On For The First Time, Trucker Life. They did find a bad intake. Various sensors in the system can cause a derate., Web the driver display says 25% torque derate in 3 hours. Web engine derate in 3 hrs, seek service immediately! It is a semi tractor. Web Web The Driver Display Says 25% Torque Derate In 3 Hours. I have had a 2013 pete with an isx15 cm2350 550hp in the shop several times over the past month that is driving me nuts., Peterbilt websites. Or, stop in at one of the nearly 600 Kenworth and Peterbilt dealership locations found throughout the U.S. and Canada. The PACCAR Emissions Solution Safe. Efficient. Reliable. And good for the Environment. PACCAR Engine Manufacturing Facility Parts Distribution Centers Kenworth & Peterbilt Sales & Service Distribution Locations, Web engine derate in 3 hours peterbilt 579. I’m new to all this new emission system. I’m New To All This New Emission System. Web engine derate in 3 hours peterbilt 579. Web i have a 2016 kw t880 with 93k miles on isx15 450hp i just got this message yesterday and it’s got me all panicked. , operating properly. An ‘inducement’ may also be referred to as an engine derate There are three primary events that could initiate an inducement/derate: (1) Low Diesel Exhaust Fluid (DEF) level, (2) Incorrect fluid in DEF tank, and (3) SCR Faults. The driver will recognize this as a performance penalty initiated by the, I have had a 2013 Pete with an ISX15 CM2350 550HP in the shop several times over the past month that is driving me nuts. It sets fault code 3714 - Engine Protection Torque Derate - Condition Exists. The driver display says 25% torque derate in 3 hours. It starts to count down, but never goes 3 hours until it clears itself., 3 • The E90 mixer (1) is shorter than the mixer for the E70 (2). The mixers are model specific and designed to disperse the ammonia into the exhaust ... 60 mph) but could take up to one hour. NOTE: The vehicle may also be driven when the mileage countdown range is insufficient for the test drive (mileage range has reached 0). Only the engine ..., Engine Reaction Derate 25% , 30 seconds shut down. Verification SCR Efficiency Test Check as follows: 1. Connect DiagnosticLink ®. 2. Turn the ignition ON (key ON, engine OFF). 3. Check for multiple fault codes. Are fault codes SPN 4363/FMI 3 or 4 also present? a. Yes; diagnose the other fault codes first. b. No; Go to step 4. 4.