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Po840 code is shown both fans are working and relays are working

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The description I get for code 840 is a problem with the transmission pressure sensor.
You might want to check with GM on that.

Posted on Jan 10, 2013

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1 Answer

Cooling fans not coming on in 2007 chevy equinox


The cooling fans are computer controlled, the engine temperature at which they are turned on is about 225-230F, the signal comes from the ECT sensor. The fans are controlled through a relay in the underhood fuse and relay power distribution box, the location of the fan relay is shown on a sticker on the bottom of the lid over the power distribution box. The fan system is tested by the computer when you run a fault code test with a code reader or a scanner. Do this and see if a fault code comes up. DO NOT OVERHEAT THIS ENGINE OR YOU WILL DO SERIOUS DAMAGE TO THE CYLINDER HEAD GASKETS RESULTING IN A HUGELY BIG REPAIR BILL. Get this repaired ASAP.

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I have only looked at a couple of schematics (circuit drawings) but each one has shown a relay (actually 2) being operated by the temperature sensor(s)...

Perhaps the relay is marginal enough to need the direct short to operate...

or not... but you always wanted a spare to carry with you... Yes?

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Truck has recently begun to go straight into limp home mode immediately after starting. the cooling fan starts in high speed with no A/C running.


Make sure ac compressor clutch is not engaged even though ac switch is off. If clutch is turning compressor on due to stuck relay etc, ecm will turn on fan due to signal from pressure switch. You may need a scan tool to view scan data and determine source of fan issue

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Dodge Stratus R/T fan doesn't come on while car is running and car is getting hot.


FAN NOT WORKING


It can be issue with faulty motor or its faulty fan control relay.


Bother are to be inspected.

Test volt at fan relay and fan motor.

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For more help, I suggest you to go through the troubleshooting links mentioned below:-----

Click the link below: ------

How to replace Cooling Fan on Acura Car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cooling-fan-on-acura-car.html

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OBD Code P1490 low speed fan relay ckt open-short

http://schematicsdiagram.blogspot.com/2012/11/obd-code-p1490-low-speed-fan-relay-ckt.html

---------------

Engine cooling components working?

http://repairhelpcenter.blogspot.com/2011/11/engine-cooling-components-working.html

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How does Vehicles Engine cooling system works?

http://repairhelpcenter.blogspot.com/2011/11/how-does-vehicles-engine-cooling-system.html

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Hyundai Sonata cooling fan not working

http://schematicsdiagram.blogspot.in/2012/02/hyundai-sonata-cooling-fan-not-working.html

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Fuel pump relay and cooling fan relay troubleshooting on 1997 ford thunderbird?

http://repairhelpcenter.blogspot.com/2011/10/fuel-pump-relay-and-cooling-fan-relay.html

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Fan belt routing diagram for 2004 Volkswagen Jetta?

http://carbeltrouting.blogspot.com/2011/12/fan-belt-routing-diagram-for-2004.html

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Timing belt, drive belt, serpentine belt, accessory belt, fan belt, engine belt routing diagrams for all types of car models?

http://carbeltrouting.blogspot.in/2012/02/timing-beltdrive-beltserpentine.html

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A/C, heater, defroster fan, not working?

http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html

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Blower fan not running on Isuzu trooper?

http://technoanswers.blogspot.in/2012/02/blower-fan-not-running-on-isuzu-trooper.html

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How to replace blower motor fan assembly on 2000 GMC Yukon?

http://repairhelpcenter.blogspot.com/2012/01/how-to-replace-blower-motor-fan.html

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Heater AC or defroster fan not working on KIA?

http://technoanswers.blogspot.in/2012/02/heater-ac-or-defroster-fan-not-working.html

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These will help.

Thanks.

Nov 27, 2012 | Cars & Trucks

2 Answers

My car turns off after i turn it on ,or when stoping ,chrysler lhs 99


the code 1490 is for the low speed fan. does it over heat. the other code is for battery being disconnected. has the battery be disconnected if it has not check the battery post to see if they are tight

Nov 26, 2012 | 1999 Chrysler LHS

1 Answer

The code reader says i need a fan relay but when i checked under the hood it was a big 30A fuse,i changed it but the fan still doesnt turn on, also i took out one of the fans before i used the code reader,...


you do need both fans in order for the system to work the other fan relay is on the firewall behind the glovebox check that but usually the computer says its a relay but in all reality its usually the fans I would certainly check the relay but would also try running a jumper wire from the battery to the positive wire to the fans if they power up its not the relay but the switch

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1 Answer

1996 corrvette cooling fans do not come on unless u put on ac. Scanner reads same temp as analog gauge.digital reads[ 0 ] Car will overheat other wise. thank you


sounds like the cooling fan isn`t coming on when its suppose to.if you have 2 fans on the car then the one that comes with the a/c only works with the a/c.the other one works with the engine temperature sensor that sends a signal to the computer that turns on the cooling fan.cooling fans are a common problem with gm`s.with jumper wires you can feed the fan directly from the battery if it won`t work then the fan needs replacing.it could also be the fan relay in the relay box.have you checked the fuses.with it having been on a scanner it should have shown a code for the circuit,as such if there was a problem with the relay,fuse or computer it should have shown it.so i would say its probably the cooling fan motor.

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