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P1660 code fans wont run tried everything installed jump wire with fuse link still run but still have code p1660 my scanner says its a high idlea lamp control circuit looked it up on internet said p1660 code was cooling fan control circuit

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Posted on Jan 02, 2017

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SOURCE: replaced both cooling fans all

when you first start the vehicle the fans whill cycle automatically. when the engine reaches temp the fans should kick on if they don't it is most like that you have either a weak relay or a loose wire very seldom would it be a severe ecm malfunction. please rate this solution

Posted on Aug 29, 2008

  • 607 Answers

SOURCE: cooling fan wont kick in

Could be the FAN MOTOR, COOLING FAN TURN ON SENSOR, even the PCM. There are 2 fuses . Also check fuse panel under hood in engine compartment

Posted on May 08, 2009

  • 607 Answers

SOURCE: 1992 Cadillac Coupe Deville blower fan runs all the time

The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps

Posted on May 21, 2009

  • 6674 Answers

SOURCE: how do you fix a gm obd2 code p1660 output circuit

It's probably a bad connection to cooling fans, bad cooling fan, or relay in that circuit. Another spot to check is to clean backside of fuse block under hood, as they have been known to corrode up & cause similar problems.

Posted on Sep 17, 2009

  • 173 Answers

SOURCE: 1999 cadillac deville overheats

every thing that is electric needs a power and a ground if running a new wire to the fans i would prefer you to use a inline fuse this will keep the wire from catching on fire. u could run the power wire to a fuse that is ignition switch 1,2,3 one of these will work so when u turn the key they kick on. also the ground could be a bolt on the bottom of vehicle. use a test light and see if that wire hanging down is a power wire. hope this helps

Posted on Apr 09, 2010

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05 land rover freelander. When turn on ac, high speed fan will not turn.replace the engine coolant temperature sensor. I unplug the switch of the fan and jumped it to the battery high speed came on.

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Key wont start 79 mark have to jump the solenoid replaced ICM & solenoid havent checked fuseible lin short at pos cable caused this k

Check the small wires going to the starter solenoid. Hook up a voltmeter on the wires and see if you have power in the crank position. The ignition relay may be why power is not going through the keyswitch. The fusible link, probably not a problem if the engine runs.

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Cooling fan wont come on causing car to run hot

Could be a fuse, relay, temperature sensor, damaged wiring or the fan motor itself.

Mar 08, 2011 | 1999 Chevrolet Cavalier

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Blower motor not working at all,,the fuse is good and the fan blows if i jump it to the battery

HI Get a test lamp.With blower control switch on high ,remove power wire from blower motor,see if you have power at wire ,if not check for power at blower resister which is mounted next to fan motor.You should have power on two wires,one coming from switch the other going to fan.If you have power going to resister ,the resister is bad ,if no power to resister, switch has a problem Good Luck

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Fans stopped working both heat and cool air fuses check good whats my problem ?

If you have the automatic system, you will need to retrieve Diagnostic Trouble Codes (DTC)'s. If fuse #3 (7.5A) in the drivers underdash fuse/relay box is good, it could be a poor ground at G401. Try jumping #2 terminal (blue/red wire) at blower motor 2P connector to a good ground. If the motor runs at high speed, with the ignition switch on, the problem could be with the power transistor connection. If the motor doesn't run at all, the problem could be with the relay, the motors, or the related wiring and/or connections. A factory service manual is required for the identification of wires circuits and connectors.

Oct 07, 2010 | 2003 Honda Pilot

2 Answers

Help with why coolent fans wont come on

Theres a relay (3) and fuses that power up the relays. The computer turns the relays on and if the computer tries and can't it'll turn the cheak engine light on. a technition with a scanner can conmand the fans on. Theres two fans and the motoors can burn out. Some stores sell the whole assembly and others will sell replacement motors. Finding the ground wire and make sure it's a ground and the power wire add power with a jumper wire and see if the motors will run with power added. With the fan relay removed and the key on there should be two pins hot and two pins ground if the fans are comanded on. With the coolant temperture senser unpllugged the fans should be on. Where the relay plugs in one of the wires goes cold with the key off the other stays hot all the time. across from the one that stays on all the time is the wire to the fan, jump power to it and the fans should run. if they do but not good or it draws alot of power from your jumper then the motors are likly bad the one the runns good then just change the bad ole and put in a new fuse. the motrs are left and right as you sit in the drivers seat

Jan 06, 2010 | 1998 Plymouth Voyager

2 Answers

Fan is not working at all. I've checked's fine. Does the motor need to be replaced?

Fan motors aren't uncommon to go out. Coolant temp sensors are also VERY common to go out.

DON'T do this until after you have let the car sit for 1/2 hour or so. Open the hood and try to turn each fan by hand. Does it sound bad? rough to turn?? motors are bad. If all seems fairly ok, then you can either................

Work the connecters of the fans on and off a bit. Do they look corroded??

Check fuse #16 on the dash fuseblock.

Check the fuseblock on the battery, specifically the 3rd jumper bar from the left (40amp, fan control module) CAREFULLY work the nuts to make sure corrosion isn't an issue,

Also check the 1st on the left of 3 blade fuses right there (30amp, fan)

On the lower pass? side of the rad there's a thermo sensor- unplug it. It's a 3 pin connecter. I think yours has the pins arranged in a triangle form.

3 2

these are your pin numbers. Make sure the fans are plugged in. on the connecter, not sensor, jump pins 1 & 2. Turn key on Both fans should run at low speed. Then jump pins 2 & 3. Turn key on, both fans should run at high speed. If no go, volt test from the red wire to ground- should be 12v.
Got power? Motors are bad.

No power?? fan control module may be bad. Its under the lower rad support.

.......or try to jump the fans , where the red wires connect are power, where the brown wire would connect is ground.

good luck....

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1 Answer

How do you fix a gm obd2 code p1660 output circuit signal high

It's probably a bad connection to cooling fans, bad cooling fan, or relay in that circuit. Another spot to check is to clean backside of fuse block under hood, as they have been known to corrode up & cause similar problems.

Sep 17, 2009 | 1998 Cadillac Seville

2 Answers

Wont turn over with key?

W/out knowing details on your vehicle, it makes it very difficult to help. Year? Stick or auto>? engine/trans info. Does it have an alarm installed or a factory security system?

Common checks would be park/neutral switch (Or clutch switch if its a stick), fuses (some cars actually fuse the start signal), old alarm brain that has activated and cut off starter signal, and do the cluster lamps go into SELF TEST and all light up when you turn the key to CRANK. If the lamps do the normal cranking bulb check, then likely your ignition switch is working. depending on the year, ford ignition switches sometymes could be a common problem. But without info to look up a diagram, cant offer more help than generalities

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