Question about 1999 Dodge Neon

4 Answers

Code 1491 I have change the fan relay check all the fuse and the temperature sensor. I check the fans put voltage directly from the battery and the work fine

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  • El pelon Jun 18, 2008

    I like to know how can check the PCM Because I trait everything in that circuit and the fans still not running

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4 Answers

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Well do what i did just hard wire your fan so when the car is on the fans are on.

Posted on Jun 18, 2008

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I would wire the fans to a switch inside the car. Then you can turn them on anytime you like. I have had to do this before.
Thanks,
Lee

Posted on Jun 18, 2008

  • Lee A.
    Lee A. Jun 19, 2008

    If you need any further assistance don't hesitate to ask. If I don't hear back I will assume you found this more then helpful, but if you do get a chance and could accept and rate accordingly it would be greatly appreciated.
    Thanks,
    lee


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What is the trouble, then?

Posted on Jun 18, 2008

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What is the problem happening?

tell that clearly first sir,

Posted on Jun 18, 2008

  • 3 more comments 
  • dewan nafees ahmed Jun 18, 2008

    after changing the new fuse u must disconnect the battery for a minute for the error to disappear.

  • dewan nafees ahmed Jun 18, 2008

    http://autorepair.about.com/library/illu...


    SYMPTOM

    P1491 - Radiator Fan Control Relay Circuit



    POSSIBLE CAUSES

    An open or shorted condition detected in the radiator fan control relay
    control circuit. This includes PWM solid state relays. The manufacturer
    doesn't provide any further information regarding this code.



    NOTE: This vehicle is not equipped with Radiator Fan Control Relay, however the vehicle does have a Condenser Fan Relay.

    http://dodgeram.info/tsb/2002/08-015-02....

    You can't
    find the Cooling Fan Motor Relay because you don't have an electric
    cooling fan. The only cooling fan you have, besides the one on the end
    of the water pump, is the A/C condenser cooling fan. That relay is in
    the Integrated Power Module, under hood relay box.


    There is
    no diagnostic procedure for DTC P1491 since you do not have that
    system. I would double check the code and if it is indeed giving that
    code, it is possible the PCM is damaged.






  • dewan nafees ahmed Jun 18, 2008

    this will help u i hope.

    link

    dont forget to accept the solution if u go by it.

    thank you.

    have a good day


  • dewan nafees ahmed Jun 18, 2008

    Flash the PCM using the MDS2 (Mopar Diagnostic System) and DRBIII.

  • dewan nafees ahmed Jun 18, 2008

    i would recommend you to read the solution in detail sir.

    the last link i gave u had the details.

    all given by ur company directly.


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The location of a 2002 chevy cavalier cooling fan sensor


The cooling fan is controlled by the PCM - powertrain control module through a relay ! There is no cooling fan sensor , there is a coolant temperature sensor ! This coolant temperature sensor is an input to the engine computer , if there were a problem wit the sensor the check engine light would be on .
Cooling Fan Control
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1999 Dodge Neon Issues (HELP)


Here's a link to the P0340 code,and P1491.Powertrain Diagnostics Manual P-1491 Radiator Fan control relay circuit
Set condition: An open or shorted condition is detected in the radiator fan relay control circuit.

Possibilities:
Fan relay ground circuit open
Fused B+ circuit open
Rad fan control relay defective
RF relay output circuit volt cycles over to batt voltage
RF relay control circuit open
RF relay ctrl rly ckt wir harness observable or intermittant defect
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Get out your Multimeter.

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The two cooling fans in my 1998 camry 4cyl. don't come on, ever.


HI. I have a very thorough, step by step procedure that will help troubleshoot this issue. follow carefully, to isolate the problem, Use extreme caution when preforming this inspection procedure.


Step1
Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.

Step2
Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.

Step3

Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.

Step4
Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.

Step5

Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.

Step6
Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.

Step7
Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.

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You will need to check the fan relay, fuse and temp sending until The fan is turned on automatically when you turn to ac and defrost. The rest of the time it is controlled by pressure. I doubt it is the fuse because it is working on ac. Good news is that you can still get heat just by leaving it on ac but putting your temp all the way up until you find the problem. (assuming you are in an area like I am where it is getting coooolddd out there.

Hoe this helps.

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1 Answer

Cooling fan is not coming on . the fuse is intact.


HI. Here is a step by step troubleshooting guide that will help you isolate the issue. use caution, and follow carefully.

Step1
Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.
Step2
Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.
Step3
Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.
Step4
Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.
Step5
Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.
Step6
Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.
Step7
Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.

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1 Answer

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Use this thorough testing procedure to troubleshoot this issue.

Step1
Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.
Step2
Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.
Step3
Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.
Step4
Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.
Step5
Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.
Step6
Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.
Step7
Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.

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I HAVE A 95 C280 FANS DO NOT TURN ON WHEN AC TURNED ON


Hi. here are a few steps that will help you troubleshoot this fan issue you are experiencing.

Step1 Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail. Step2 Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow. Step3 Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector. Step4 Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing. Step5 Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan. Step6 Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one. Step7 Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.


Please rate and god bless.








Mar 25, 2009 | 1995 Mercedes-Benz C-Class

1 Answer

Code 1491


1491-radiator fan relay control circut
1492-ambient/battery temp sensor volts to high
check and make sure your radiator fan is coming on
samboiv















Jun 18, 2008 | 1999 Dodge Neon

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