Intake heater light on freightliner

SPN 3223 Aftertreatment 1 Intake Gas Sensor Heater Control FMI 7 . SPN 3223 FMI 5 . What is SPN 3223 FMI 7? This code is telling you the NOx Inlet Sensor …

Intake heater light on freightliner. When I turn my truck on the "Wait to start" light does not come on. I noticed it about a week ago and tried fixing it last weekend. ... 1999 Dodge Ram 2500 Laramie 4x4 Quad cab Automatic, Air Dog 150, S&B Cold air intake and intake elbow, MBRP 4 inch turbo back exhaust, Quadzilla Adrenaline w/ Pulse monitor, redhead steering box, …

yup. Its probably a connection problem with the wire that plugs into the board behind the light. try and clean the plug. Had this in a '99 IH with ISM. Turned out to be the water temp. sensor. FLD's are notorious for giving bogus warnings at the top of the dash due to bad connectors or sensors.

Saf-T-Liner C2 School Bus Maintenance Manual. Foreword. Introduction. 00 General Information. 01 Engine. 08 Electric Drive. 09 Air Intake. 13 Air Compressor. 15 Alternators and Starters.Pre-heat (after key On and before cranking): At key On, the ECM checks the intake manifold air temperature. Based on this temperature, the ECM lights a Wait to Start lamp and energizes the intake air heaters (as Figure 1.1 above). After a calibrated period of time, the ECM turns off the intake air heaters and the Wait to Start lamp turns off.Once …09 Air Intake . 09–01 Air Cleaner Element Inspection and Replacement ; 13 Air Compressor . 13–00 Safety Precautions ; 13–01 Air Compressor Inspection ; 15 Alternators and Starters . 15–00 Safety Precautions ; 15–01 Alternator, Battery, and Starter Connections Check ; 20 Engine Cooling/Radiator . 20–00 Safety Precautions ; 20–01 ...i have fl 8o with 3126 intake heater light will stay on or keeps coming on draining my alternator. Answered in 6 minutes by: Technician: Cat Man. Hi. Thanks for using JA! I will try and help you out. The most likely cause of your problem is a faulty Inlet Heater relay. I have seen this before. The relay is located on top of the engine and ...Mar 19, 2013 · Intake Manifold Heater Light Stays On!! 5669 Views 5 Replies 4 Participants Last post by ColinP, Jan 8, 2016. P. pjcovey40 Discussion Starter ...

Engine Light error show heater voltage high or short in the signal circuit. Does anyone have a history with this and can show me where the relay and heater is located so I can check the wiring and Intake Air Heater location and relay. 20–03 Coolant Heater Check, Webasto Inspect the coolant heater every 12 months. 00 General Information Vehicle Maintenance Schedule Table: 00–02 00/2 Walk-In Van Chassis Maintenance Manual, May 2022 Freightliner Truck reserves the right to discontinue models and to change specifications or design at any time without notice and without incurring obligation. Descriptions and …Take the rated watts for your heater divide by operating voltage gives you your amps. So if I’ve done the math correctly my engine block heater a 1000w unit using a 120 volt line draws 8.33 amps. 1000 / 120 = 8.33. Location: West Palm Beach, FL. USA.Freightliner Custom Chassis ... 09 Air Intake . 09–01 Air Cleaner Element Inspection and Replacement ; 13 Air Compressor . ... 83 Heater and Air Conditioner . 83–00 Safety Precautions ; 83–01 Air Conditioner Inspection ; 83–02 HVAC Air Filter Replacement ; 88 Hood, Grille, and Cab Fenders ...

New Design Old Design11. Inspect the intake pressure/temperature sensor and wiring connector for signs of damaged, bent, spread, corroded or unseated (pushed out) pins and signs of moisture in the connector or wire damage near the connector. Is there any sign of damage present? a. Yes; repair as necessary. Go to step 16. b. No; replace intake pressure/temperature ...Jul 30, 2011 · 76 posts · Joined 2011. #1 · Jul 30, 2011. I was driving today and the wait to start/glow plug light started flashing along with chimes. Now it's on permanently. Anyone know why that is. All other gauges read ok. No check engine light and truck starts and shuts down as normal. Any help would be appreciated. Thread Tools. 2001 Cummins 5.9 ISB 300HP What's the purpose of the inlet or intake heater? Is it used instead of glow plugs? When does it operate? If it goes inop …Cummins isb6.7 in a freightliner m2 106. an intake heater was ordered for this unit wich is a 6hr job all the fuel line need to be removed. I looked atvthe c...EZWiring EZWiring™ makes Freightliner, Sterling, Western Star, Thomas Built Buses, and Freightliner Custom Chassis Corporation products’ wiring drawings and floating pin lists available online for viewing and printing. EZWiring can also be ac-cessed from within PartsPro. Introduction Descriptions of Service Publications

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This time of year, you’ve gotta do some work to keep your home warm and cozy. Christmas lights, decorations, an extra throw blanket on the couch. And, of course, a space heater. Bu...The “wait to start” light comes on ever time during pre-start, but grid heaters never engage. It’s never worked since I bought the MH in 2013. I’ve used block heater to preheat engine prior to starting. Van Willams had this problem in 2015 and he checked all connections in engine room area which ended up resolving the problem.I run four sets of them 2 in the head light and 2 in the fog and the never go out not when starting or grid heater 2001 Dodge 2500 quad cab , Auto, 306,xxx miles, S&B Cold Air Intake, Expandit 5 inch straight piped system, Smarty, Edge Insight CS for gauges , HID Fog Lights 8000k, HID Head Lights 4300k, Electric/Heated tow mirrors, Painted ...Jun 12, 2017 · Posts: 944. Check Engine Light - Grid Heater. I have a CAT C-7 (350 HP) in a Travel Supreme motorhome with a check engine light illuminated due to the following codes: 70-5: Inlet Air Heater Driver #1. 729-5: Air Intake Heater Open Circuit. I checked the grid heater solenoid and it is good, but it appears I am not getting control power to the ... Shouldn't the intake heater indicator stay on longer than 2-3 seconds on cold mornings ? If I could find the relay I'd like to test it to see if it is faulty. 0 likesA cold-air intake -- one ducted to bring air in from outside the engine bay -- won't necessarily change the sound of a car, but a short intake will. This noise can be quite pronoun...

Propane heaters can make cold winter nights a lot more bearable. Here's a list of some of the best indoor and outdoor propane heaters to keep you warm this winter season. If you bu...Thanks for the help cat. I mention 30 seconds cause this troubleshooting guide I'm reading says 30 second cycle time over and over Troubleshooting 3114, 3116 and 3126 Engines Media Number -SENR6502-06 So, Yeah, according to this document the coolant temp, oil pressure switch, power relay, and control module are the factors to look …C3-A Optional Fuel Water Separator Heater C4-C Left Park Lamp C4-L Right Park Lamp C4-D Left Marker Lamp C4-M Right Marker Lamp C3-N Turn Left Front/Side C1-G Turn …I operate a 2010 Freightliner M2- 112 with an MBE4000 mercedes engine. It has about 20k on it. It has an "intake heater" flashing light on the dash that the dealer can't seem to find the cause of. The closest dealer is over an hour away, so it takes a lot of time to take it there. When...Jun 12, 2017 · Posts: 944. Check Engine Light - Grid Heater. I have a CAT C-7 (350 HP) in a Travel Supreme motorhome with a check engine light illuminated due to the following codes: 70-5: Inlet Air Heater Driver #1. 729-5: Air Intake Heater Open Circuit. I checked the grid heater solenoid and it is good, but it appears I am not getting control power to the ... I have a 2004 FREIGHTLINER M2-16 with a DT 466 Diesel engine. While driving it it runs fine but at decceleration at almost full stop, it starts shaking and acting up and the intake heater light comes … read moreGot a 11/98 2500 cummins with 5 5spd and been having trouble with the intake heater. Basically the wait to start light is on whenever the key is off and its killing my batteries. ... The indicator then remains illuminated until the ECM detects that the air within the intake manifold is the proper temperature to ensure reliable and efficient ...Blog Entries: 1. CAT 3126 does not have glow plugs and uses an air intake pre heater. Not sure there is a fuse for that but check the wiring diagram for your coach and see. Or, a visit to a CAT shop. __________________. 2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018. 2019 Grand Designs 384GK-R 5th wheel. FREIGHTLINER M2 Heater Assembly. OEM #: A22-59312-000. SURPLUS RED DOT AUXILARY HVAC A/C HEATER ASSEMBLY FLOOR MOUNTED P/N: A22-59312-000 REPLACED BY P/N: RDH R4225 1. Create Estimate. Part Info. (541)922-6455 Request Info Enterprise Hagerman Inc. UMATILLA OR. $600.00. Posts: 944. Check Engine Light - Grid Heater. I have a CAT C-7 (350 HP) in a Travel Supreme motorhome with a check engine light illuminated due to the following codes: 70-5: Inlet Air Heater Driver #1. 729-5: Air Intake Heater Open Circuit. I checked the grid heater solenoid and it is good, but it appears I am not getting control power to the ...

Leading Solutions for Cold Starts & Emissions Reduction. Air Intake Heaters, also known as grid and manifold heaters, provide solutions for diesel applications such as On-Highway, Off-Road and Power Generation. Powered by the vehicle battery, air intake heaters provide an on-board, stand-alone cold weather starting aid without driver intervention.

Grid heater light kicked on while driving. so just got the truck with 170,000 and was perfectly fine ( dealer let me take it home for a few days). Then dealer threw in a smarty programmer he had ordered for it and i set it on level one to start with. I took it down the highway and when cruising at 70 the wts light kicked on and chimed a few times.I run four sets of them 2 in the head light and 2 in the fog and the never go out not when starting or grid heater 2001 Dodge 2500 quad cab , Auto, 306,xxx miles, S&B Cold Air Intake, Expandit 5 inch straight piped system, Smarty, Edge Insight CS for gauges , HID Fog Lights 8000k, HID Head Lights 4300k, Electric/Heated tow mirrors, Painted ...Mar 29, 2010 · We have had numerous inake heater relays fail on 3116/3126 engines. The C7 engines use a heavier relay. The earlier relays are to small to carry the 90+ amp load. On the 3116/3126 engines we have been using the Blue Bird relay that is used for the body heater/light functions. It does require replacing the terminal ends with something much heavier. Gasoline engines use an intake manifold to deliver a fuel and air mixture to each cylinder for combustion. Intake manifolds once were made of cast iron. The biggest problem with ca... To contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. Vehicles domiciled in Canada that are thought to have a defect that could cause a crash, injury, or death, should immediately be reported to Trans-port Canada and Daimler Truck North ... 813 posts · Joined 2007. #1 · Nov 18, 2009. Started the truck yesterday and check engine light came on. Checked codes with Smarty and there were two of them. They were P2609- No voltage drop seen from intake air heater and P0542- High voltage on the #1intake air heater relay. After checking the codes I noticed that my grid heater is not ...Mar 6, 2020 · This heater is a GREAT drain on the 12 volt system. (240 amps). The heater comes on when the ignition is turned on and runs providing heat to the intake of the turbo when cold starting. Hence the "Wait to start" light on the dashboard. If you activate the start before this light goes out, you will overload the circuit and possibly the fuse will go. NOTE: If the check engine light illuminates dur- sition is left blank. ing vehicle operation, take the vehicle directly to The instrument cluster has an emergency buzzer that an …813 posts · Joined 2007. #1 · Nov 18, 2009. Started the truck yesterday and check engine light came on. Checked codes with Smarty and there were two of them. They were P2609- No voltage drop seen from intake air heater and P0542- High voltage on the #1intake air heater relay. After checking the codes I noticed that my grid heater is not ...

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09 Air Intake . 09–01 Air Cleaner Element Inspection and Replacement ; 13 Air Compressor . 13–00 Safety Precautions ; 13–01 Air Compressor Inspection ; 15 Alternators and Starters . 15–00 Safety Precautions ; 15–01 Alternator, Battery, and Starter Checking ; 20 Engine Cooling/Radiator . 20–00 Safety Precautions ; 20–01 Radiator ...Gasoline engines use an intake manifold to deliver a fuel and air mixture to each cylinder for combustion. Intake manifolds once were made of cast iron. The biggest problem with ca...76 posts · Joined 2011. #1 · Jul 30, 2011. I was driving today and the wait to start/glow plug light started flashing along with chimes. Now it's on permanently. Anyone know why that is. All other gauges read ok. No check engine light and truck starts and shuts down as normal. Any help would be appreciated.Walk away from the tea lights and the terracotta pot. You probably know space heaters can be dangerous and have to be used very carefully, so the appeal of a TikTok hack for making...09 Air Intake . 09–01 Air Cleaner Inspection ; 13 Air Compressor . 13–00 Safety Precautions ; 13–01 Air Compressor Inspection ; 15 Alternators and Starters . 15–00 Safety Precautions ; 15–01 Alternator, Battery, and Starter Connections Check ; 20 Engine Cooling/Radiator . 20–00 Safety Precautions ; 20–01 Pressure Relief Cap CheckIntake Grid Heater light. Have a 2002 7.3 F-350. Just started having the intake heater light stay on while driving it all the time also noticed a small amount of white smoke on start up. I've read that it shouldnt be on because I'm driving, above 32* F, BLAH BLAH. Wondered if I deleted it would that fix the light or is it a relay problem.Freightliner Truck reserves the right to discontinue models and to change specifications or design at any time without notice and without incurring obligation. Descriptions and …Freightliner MBFME190887 Relay Intake Air Heater Co . Brand: Freightliner. Currently unavailable. We don't know when or if this item will be back in stock. CASCADIA MAINTENANCE MANUAL Models: CA113DC CA113SLP CA125DC CA125SLP STI-478-6 (02/03/2022) Published by Daimler Truck North America LLC 4747 N. Channel Ave. Portland, OR 97217 To contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. Vehicles domiciled in Canada that are thought to have a defect that could cause a crash, injury, or death, should immediately be reported to Trans-port Canada and Daimler Truck North ...163. Wait to start light is not coming on. But engine starts. The wait to start light is for the engine intake air heater. When key is first turned on, all the lights on the dash come on for a couple of seconds, including the wait to start light. But it used to stay on for a few seconds after that, then go off signaling it was time to turn the ... ….

yup. Its probably a connection problem with the wire that plugs into the board behind the light. try and clean the plug. Had this in a '99 IH with ISM. Turned out to be the water temp. sensor. FLD's are notorious for giving bogus warnings at the top of the dash due to bad connectors or sensors.EZWiring EZWiring™ makes Freightliner, Sterling, Western Star, Thomas Built Buses, and Freightliner Custom Chassis Corporation products’ wiring drawings and floating pin lists available online for viewing and printing. EZWiring can also be ac-cessed from within PartsPro. Introduction Descriptions of Service Publications27 Freightliner Trucks Service Manuals Free Truck Manual Wiring Diagrams Fault Codes Pdf. Wiring Diagrams Compact Nsx Contents. Wiring Schematic Manualzz. Freightliner Service Repair Manuals Wiring Diagrams Truck Pdf. M2 Multiplexing Emtsp. Freightliner Features. Freightliner M2 2003 2016 Installation Guide Zonar Systems …We have had numerous inake heater relays fail on 3116/3126 engines. The C7 engines use a heavier relay. The earlier relays are to small to carry the 90+ amp load. On the 3116/3126 engines we have been using the Blue Bird relay that is used for the body heater/light functions. It does require replacing the terminal ends with something much heavier.Freightliner Fuel Heaters. Shop All Freightliner Fuel Heaters . Cascadia 22 Century Class 1 Century Class 120 1. Columbia 3 Columbia 120 3 Coronado 1. FLD120 1 FLD120 Classic 1 M2 1 M2 106 1. Newly listed Freightliner fuel heaters. 2012 Freightliner Cascadia Fuel Heater. by Vander Haag's Inc. New Design Old Design Intake Heater Light: Troubleshooting Tips for Bus & Freightliner | JustAnswer. Ask an Expert. Car Questions. Truck Repair. This answer was rated: …Blog Entries: 1. CAT 3126 does not have glow plugs and uses an air intake pre heater. Not sure there is a fuse for that but check the wiring diagram for your coach and see. Or, a visit to a CAT shop. __________________. 2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018. 2019 Grand Designs 384GK-R 5th wheel.Aug 21, 2018 · Originally posted by dsalinas1939. i may have put this up before not sure but i have this 2014 c2 and its setting a 3494 code its intake heater mechanical fault i ran down the diagnostic tree and its tellin me it have to take to dealer for next procedure the heater eliment is working fine when i turn key on i hear it click on then off i see it ... Intake heater light on freightliner, 18 Manual Transmissions and Clutch. 19 Drive Axles. 20 Fifth Wheels. 21 Trailer Couplings. 22 Headlights. 23 Vehicle Appearance and Care. 24 Pre- and Post-Trip Checklists. 25 Pre- and Post-Trip Inspections and Maintenance. 26 In An Emergency., Even I know not to do this...water from washing and rain was entering the air box from the head light and saturated the filter, which in turn contaminated the air intake heater. The filter was also saturated with water and the filter oil they used. Cost Break Down: OEM Air Box =$271.48 Mass Air FNC with Sensor=$344.25., I have a 2006 Bluebird Vision with a C7 Cat giving me fits. The "wait to start" light is on constantly KOEO or engine running and the grid heater is never activated at cold start up. If I supply power and ground to the solenoid it activates and the heater works as it should, with the signal wires disconnected I have ground on one and 7.2 Volts ..., The heater will stay on for a few minutes, It is there to help starting and reduce smoke during warmup.i haven't worked on cats in a few years but i think the heater can stay on for up to 5 minutes in extremely cold environments. and yes they will draw voltage down .On our Freightliner m2 trucks with cummins engines,the intake heater will cycle ..., Re: CAT 3126B "Wait to Start" Light. « Reply #4 on: October 23, 2012, 05:05:05 PM ». Rod, Certainly sounds like a loose connection or the pre-heat relay/solenoid with the points sticking. Locate the relay. With a voltmeter, check for 12 VDC on the large wire out to the intake heater when someone turn the key on., I have a bus with a caterpillar 3126b with cel and intake heater light on has a 70-5 inlet air heater driver #1. how do - Answered by a verified Technician ... i have a freightliner fl70 2000, when i start it up it runs great , full power, in 10 minutes the check engr light comes on and i loose power, ..., SPN 3223 Aftertreatment 1 Intake Gas Sensor Heater Control FMI 7 . SPN 3223 FMI 5 . What is SPN 3223 FMI 7? This code is telling you the NOx Inlet Sensor …, 83.....Heater and Air Conditioner 88.....Hood, Grille, and Cab Fenders Introduction Maintenance Manual Contents I–4 108SD and 114SD Maintenance Manual, November …, top trailer lights went out on 2014 M2-106 box truck . can't locate fuse for it and desperately trying to avoid a ticket while working at night. been at … read more. Associate of Applied Scienc... 2016 m2 106. Range inhibit light is on., Leading Solutions for Cold Starts & Emissions Reduction. Air Intake Heaters, also known as grid and manifold heaters, provide solutions for diesel applications such as On-Highway, Off-Road and Power Generation. Powered by the vehicle battery, air intake heaters provide an on-board, stand-alone cold weather starting aid without driver intervention. , BUSINESS CLASS M2 MAINTENANCE MANUAL Models: M2 100 M2 106 M2 106V M2 112 M2 112V STI-455-7 (02/03/2022) Published by Daimler Truck North America LLC 4747 N. Channel Ave., I have a 2000 Freightliner FL70 with a Cat 3126 engine. This weekend we had a couple of colder mornings and the truck was very hard to start. The intake heater indicator on the dash came on when the ignition was switched on but then went out after about 3 seconds. Typically it would stay on for 30+ seconds or so before going off., Trucks, Buses, CE, AG Software & Discussions Detroit Diesel. DDEC 6 Intake heater. Have a strange issue going on this Freightliner with a DDEC6. The intake heater light comes on and the engine will idle down to 600rpm. Wait a while and play with the throttle and it works again. Its doing it more frequently as time goes on., Walk away from the tea lights and the terracotta pot. You probably know space heaters can be dangerous and have to be used very carefully, so the appeal of a TikTok hack for making..., Thanks for the information.Since the yellow check engine light comes on, this indicates the engine ECM is receiving power and functioning. There are several things that can cause a crank no start on this engine.The first is a low or no fuel pressure condition. The engine needs at least 25 psi to start. If it is low, the injectors will not get ..., The grid heaters on our Vision's here will continue to cycle causing the volt gauge to drop, the STOP light and TOO LOW with pic of battery, until the engine oil temp and the engine water temp reach 120 degrees cumulatively. So basically 60 degrees of temp on each one is suppose to stop grid heater from coming on., banyon. If the grid heater was on you would see the draw on the amp meter. Keep a test light in the truck with you & when it comes on see if the grid solenoid is getting power. It should have power to one side but not to the grid itself. The intake air sensor is the one at the air cleaner., DDC-SVC-MAN-0040.PDF - MBE 900 ENGINE 2007 OPERATOR'S GUIDE - Freightliner ... Detroit Diesel®, The grid heaters on our Vision's here will continue to cycle causing the volt gauge to drop, the STOP light and TOO LOW with pic of battery, until the engine oil temp and the engine water temp reach 120 degrees cumulatively. So basically 60 degrees of temp on each one is suppose to stop grid heater from coming on., Here is what this code means: “Exhaust Emission Controller aftertreatent 1 intake gas sensor heater control mechanism system not responding or out of alignment.” That is a mouthful to say and to write. What this means is that the “NOx Raw Sensor not ready after Dewpoint enable inspection”. In other words, the sensor failed to activate., ok, attached is a pin diagram for the air heater. check all fuses with a test light for power on both sides key on. Roy. As I said, I'm not near the vehicle, so will have to try this out later. Thanks. Ask Your Own Medium and Heavy Trucks Question. Hello, the engine number is ***** Ref No is C01-00003-394. , 09 Air Intake . 09–01 Air Cleaner Element Inspection and Replacement ; 13 Air Compressor . 13–00 Safety Precautions ; 13–01 Air Compressor Inspection ; 15 Alternators and Starters . 15–00 Safety Precautions ; 15–01 Alternator, Battery, and Starter Connections Check ; 20 Engine Cooling/Radiator . 20–00 Safety Precautions ; 20–01 ..., Re: CAT 3126B "Wait to Start" Light. « Reply #4 on: October 23, 2012, 05:05:05 PM ». Rod, Certainly sounds like a loose connection or the pre-heat relay/solenoid with the points sticking. Locate the relay. With a voltmeter, check for 12 VDC on the large wire out to the intake heater when someone turn the key on., Logged. Re: 8.3 (mechanical) Intake Preheater Problem. Reply #1 – November 23, 2023, 05:39:15 pm. The fuel solenoid needs 2 wires to operate if it is internally grounded and could have three wires which. would be the ground, One wire is the pull in circuit and the other wire is the hold in circuit. The intake preheater only works …, 2181 Posts. Posted - 03/24/2009 : 07:32:30 AM. I have a 99 GMCV with the CAT 3126. I get a check engine and intake heater lamp at the same time under a load. The engine feels like it's derating but I have limited data access with my scan tool. Fuel rate stays normal but boost will drop to 16psi at 99% throttle., There is a heater element that can be between 750 and 1,500 watts that extends into the engine's cooling jacket. The benefit to this system is that you don't have any heater hoses to worry about replacing or leaking and the heat is put directly into the engine, where it's more efficient. ... As soon as the light goes out, the intake manifold ..., EPA07 MBE 4000 OPERATOR'S MANUAL. HOT COOLANT To avoid scalding from the expulsion of hot coolant, never remove the cooling system pressure cap while the engine is at operating temperature. Wear adequate protective clothing (face shield, rubber gloves, apron, and boots). Remove the cap slowly to relieve pressure., i have fl 8o with 3126 intake heater light will stay on or keeps coming on draining my alternator. Answered in 6 minutes by: Technician: Cat Man. Hi. Thanks for using JA! I will try and help you out. The most likely cause of your problem is a faulty Inlet Heater relay. I have seen this before. The relay is located on top of the engine and ..., Here I show how to diagnose a air intake heater circuit on a Cummins Isc Engine, We have had numerous inake heater relays fail on 3116/3126 engines. The C7 engines use a heavier relay. The earlier relays are to small to carry the 90+ amp load. On the 3116/3126 engines we have been using the Blue Bird relay that is used for the body heater/light functions. It does require replacing the terminal ends with something much heavier., TWR. 1940 posts · Joined 2011. #3 · Jan 19, 2016. check the intake manifold air temperature sensor this sensor tells the ECM when to turn the grid heater on by what temp the intake is as i recall anything under 66 degrees it does not turn the heater on anything below 66 at start it turns it on the grid heater., DDC-SVC-MAN-0040.PDF - MBE 900 ENGINE 2007 OPERATOR'S GUIDE - Freightliner ... Detroit Diesel®, Freightliner MBFME190887 Relay Intake Air Heater Co . Brand: Freightliner. Currently unavailable. We don't know when or if this item will be back in stock. Important information. To report an issue with this product, click here. Product Description . Freightliner MBFME190887 Relay Intake Air Heater Co.