Question about 1994 Jeep Cherokee

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94 jeep cherokee: check engine light code 35

What does this mean? "Cooling fan relay circuit open or shorted "
electric fan works when air conditioning is on.....
was told the electric fan is just for air con and does not go on
any other condition..is this true?

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  • pchan1 May 30, 2009

    is it possible the coolant temp sensor is faulty or more likely the relay? how can i test both?

  • pchan1 May 30, 2009

    is the coolant temp sensor the same as the coolant temperature sending unit? 94 jeep cherokee

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No its not true,the cooling fan comes on when the coolant temp reaches a certain point it closes the switch in the temp sensor wich in turn closes the relay and powers the cooling fan,the reason it comes on with the A/C is that it's wired to bypass the temp sensor and associated relay because the A/C compressor forces the motor to work harder and the coolant temp to rise significantly faster,the relay needs to be replaced or you will overheat the motor and possibly cause serious damage.

Posted on May 30, 2009

  • George DeMore
    George DeMore May 30, 2009

    Yes you can test the sensor,it's a small brass plug with one or two wires at the bottom of the radiator in most cases although some vehicles have a second on the thermostat housing,if the motor is cold a continuity check to the sensor will show infinite resistance,shucks kragen autzone will test relays for free I believe.I'll check for a diagram and post it back in a comment for you.

  • George DeMore
    George DeMore May 30, 2009

    Yes they are the same,it's located on the the water outlet top center of the motor,I coulnd't find the exact location of the realay but they are generally in the fuse/relay box under the hood

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Was able to find a code, code 35, radiator fan relay circuit open or shorted. was not able to find a code for cooling fan. if that's what you have then you should be able to replace that relay. in either case if the relay were shorted the fan would run all the time, at least unless the short made the circuit blow a fuse. if it were open it would not run at all. don't think i buy the idea that the fan inside your vehicle only runs for a/c, when you turn the selector to defrost the cabin air goes the a/c dryer to help clear humidity in the air in the car and so remove moisture from inside the windows. so even when you don't turn on the a/c the car uses an a/c function. hope that helps

Posted on May 30, 2009

  • ben May 30, 2009

    there is a quick and dirty way to check the relay. if the electric radiator fan comes on when the system calls for it then the relay is switching power to the fan. how do you know when the system calls for it? that's a little more complicated. if it runs sometimes but not always, maybe even stays on for a while after the vehicle is shut off, it's probably working like it's supposed to. that does not mean that it has good communication with the engine computer. poor communication could be the issue. the sensor and other inputs can only report the conditions they recieve, if the reception is poor they don't have good info to report.

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What does this mean?????????????


P0480 Cooling Fan Relay 1 Control Circuit OBD-II Trouble Code Technical Description Article by
don.jpg
Don Bowman
ASE Certified Automotive Tech

Cooling Fan Relay 1 Control Circuit
What does that mean? This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. However, specific troubleshooting steps will vary depending on the vehicle.
If your vehicle's check engine light comes on and after pulling the code you find a P0480 displayed, if refers to the engine cooling fan circuit. It is a generic code applying to all OBD II (on board diagnostics) vehicles.
While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. When you bring the car to a stop no air is passing through the radiator and the engine begins to increase in temperature.
The PCM (powertrain control module) senses the increase in engine temperature through the CTS (coolant temperature sensor) located near the thermostat. When the temperature reaches about 223-degrees F (value depends on make/model/engine), the PCM will command the cooling fan relay to turn on the fan. It does so by supplying the ground to the relay.
There is a problem within this circuit causing the fan to fail to operate allowing the engine to overheat while sitting still or driving at a slow speed. When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set.
NOTE: P0480 speaks of the basic circuit, however codes P0481, and P0482 relate to the same problem with the only difference is they relate to the different fan speed relays.
Symptoms Symptoms may include:

  • Check engine light (malfunction indicator lamp) illumination and code P0480 set
  • Engine temperature will rise when the vehicle stops and idles
Potential Causes The causes for this DTC may include:
  • Faulty fan control relay 1
  • Fan control relay harness is open or shorted
  • Circuit electrical connections poor
  • Faulty cooling fan 1
  • Faulty coolant temperature sensor
  • Fan cooling fan harness is open or shorted
  • Cooling fan circuit poor electrical connection
  • Intake air temperature (IAT) failure
  • A/C selector switch
  • A/C refrigerant pressure sensor
  • Vehicle speed sensor (VSS)
Diagnostic and Repair Procedures It is always a wise idea to look up the technical service bulletins (TSB) on your particular vehicle to see what type complaints have been coming in to the dealer service department related to this code. Search using your favorite search engine "technical service bulletins for ....." Look up the code and the type of manufacturer recommended repair. This is also a good idea before buying a vehicle.
Many vehicles will have two engine fans, one for engine cooling and the second for cooling the air conditioning condenser, and additional cooling for the engine.
The fan that is not in front of the air conditioning condenser is the main cooling fan and the one to concentrate on initially. Additionally, many vehicles have multi-speed fans requiring as many as three fan speed relays for low, medium and high.
Open the hood and do a visual inspection. Look at the fan and make sure there is no obstruction in front of the radiator blocking airflow. Spin the fan with your finger (make sure the vehicle and key is off). If it will not spin the fan bearings are shot and the fan is bad.
Check the electrical connection at the fan. Pull the connector apart and look for corrosion or bent pins. Repair if necessary and use dielectric grease on the terminals.
Open the fuse block and inspect the cooling fan relay fuses. If they are good pull the cooling fan relays out. The bottom of the fuse block lid will usually indicate placement, but if not, look in the owner's manual.
The vehicle's PCM's function is to act as a ground to operate components, not to supply power. The fan relays are nothing but a remote light switch. The fan as well as other apparatus draws too much amperage to be safe in the cockpit, so it's kept under the hood.
A constant power supply from the battery is present on a terminal in each of the relays. This one turns on the fan when the circuit is closed. A switched terminal will be hot only when the key is on. The negative terminal in this circuit is the one used when the PCM wishes to active the relay by grounding it.
Look at the circuit diagram displayed on the side of the relay. Look for the simple open and shut circuit. Verify the battery positive terminal in the relay block with constant power. The opposite side goes to the fan. Use a test light to find the hot terminal.
Jump the battery terminal to the fan harness terminal and the fan will operate. If not, disconnect the fan connection at the fan and using an ohmmeter check the continuity between the fan side of the relay terminal and the connector at the fan, If there is continuity the fan is bad. If not the harness between the fuse block and the fan is faulty.
If the fan operated, check the relays. Look at the side of the relay for the switched power terminal or just turn the key on. Check the terminals for an additional power terminal and look where it would be on the relay.
Jump the battery plus terminal in the first test with this switched terminal and place an additional jumper from the negative terminal on the relay to ground. The switch will click on. Use an ohmmeter to test that the constant battery terminal and the fan harness terminal have continuity meaning the circuit has closed.
If the circuit has not closed or the relay has not clicked, the relay is bad. Check all the relays in the same fashion to be sure they are all working.
If there was no switched power at the relay, the ignition switch is suspect.
If they prove to be good, check the CTS with an ohmmeter. Pull the connector off. Let the engine cool and put the ohmmeter on the 200,000 scale. Probe the sensor terminals.
The reading will be about 2.5. For precise readings consult a service manual. Accuracy isn't necessary since all sensors may be different. You just want to know if it's working. Reconnect it and warm the engine.
Shut the engine down and pull the CTS plug again. Check it with the ohmmeter, there should be a big change in resistance, if not the sensor is bad.
If the above procedure could not find a failure, the probability is that a poor connection to the PCM or the PCM itself is at fault. Do not go any farther without consulting your service manual. Disconnecting the PCM could cause loss of programming and the vehicle may not start unless towed to the dealer for reprogramming.

Sep 23, 2015 | 2006 Volkswagen Jetta

1 Answer

I have a 2002 Dodge Intrepid with a code of odb480


This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. However, specific troubleshooting steps will vary depending your vehicle. pulling the code P0480 displayed, if refers to the engine cooling fan circuit. It is a generic code applying to all OBD II (on board diagnostics) vehicles. The PCM (powertrain control module) senses the increase in engine temperature through the CTS (coolant temperature sensor) located near the thermostat. When the temperature reaches about 223-degrees F (value depends on make/model/engine), the PCM will command the cooling fan relay to turn on the fan. It does so by supplying the ground to the relay.
There is a problem within this circuit causing the fan to fail to operate allowing the engine to overheat while sitting still or driving at a slow speed. When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set. Symptoms may include:
  • Check engine light (malfunction indicator lamp) illumination and code P0480 set
  • Engine temperature will rise when the vehicle stops and idles
Potential Causes The causes for this DTC may include:
  • Faulty fan control relay 1
  • Fan control relay harness is open or shorted
  • Circuit electrical connections poor
  • Faulty cooling fan 1
  • Faulty coolant temperature sensor
  • Fan cooling fan harness is open or shorted
  • Cooling fan circuit poor electrical connection. hope this helps you.

Oct 12, 2014 | 2002 Dodge Intrepid

1 Answer

What does trouble code 33 mean for a 94 Jeep Grand Cherokee?


TROUBLE CODE 33 - AN OPEN OR SHORTED CONDITION DETECTED IN THE AC CLUTCH RELAY CIRCUIT.

Jul 26, 2011 | 1994 Jeep Grand Cherokee

2 Answers

Diagnostic code for my 2007 saturn ion says p0480 cooling fan 1 control circuit malfunction. what does this mean.


WHAT IT MEANS YOUR FAN CONTROL RELAY CONTROL CIRCUIT IS OPEN OR SHORTED TO GROUND. FAN CONTROL RELAY CONTROL CIRCUIT IS SHORTED TO SYSTEM POWER. THE FAN CONTROL RELAY POWER CIRCUIT IS OPEN CHECK COOL FAN 1 FUSE. FAN CONTROL RELAY IS DAMAGED OR HAS FAILED. PCM HAS FAILED.I LISTED ALL POSSIBLE CAUSES TO CODE PO480.

Jul 05, 2011 | Saturn Ion Cars & Trucks

2 Answers

Check engine light came on computer code says p0480 what does that mean ?


P0480 is for the electrical circuit of the cooling fan relay. The cooling fan relay is about the size of a deck of cards only a little taller. It's mounted to the metal bumper support under the bumper cover on the left side, near the headlight. It has aluminum cooling "towers" on top to dissipate heat. The most likely cause for this code to set would be a failed relay. It can also be caused by a short or open circuit on the control wiring running to it, and be sure to check all fuses in the box under the hood.

Jun 28, 2011 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

Check engine code 55 jeep grand cherokee laredo v6 1997. transmission wont shift properly also pulling code 21 and i figured out that one is for the throtle position sensor


These are the fault codes for your Jeep below;

Jeep
11 IGN reference signal.
13 Fault in the map sensor pneumatic circuit.
14 Fault in the map sensor electrical circuit.
15 Fault in the vehicle speed sensor circuit.
17 Engine running too cool.
21 Problem in the oxygen feedback circuit.
22 Fault in the coolant temperature sensor circuit.
23 Air temperature sensor.
24 Fault in the throttle position sensor circuit.
25 Fault in the IAC motor drive circuit.
27 Fault in injector driver interface circuit.
31 Purge solenoid circuit.
33 Fault in air conditioning cutout relay circuit.
34 S/C solenoid circuits.
35 Fault in fan relay circuit.
41 Fault in the charging system or no field current.
42 Fault in the ASD relay driver circuit.
43 Fault in ignition coil control circuit.
44 Battery Temp Voltage.
46 Battery voltage is too high.
47 Battery voltage is too low.
51 Lean condition is indicated.
52 Rich condition is indicated.
53 Internal problem in module.
54 Fault in the distributor high data rate pickup circuit.
55 Completion of fault code display.
62 Unsuccessful attempt to update EMR mileage.
63 Unsuccessful attempt to write to an EEPROM location by the controller.
76 Fuel pump resistor by-pass relay circuit

Mar 08, 2011 | 1997 Jeep Grand Cherokee

2 Answers

P1491 diagnostics code for 2003 Jeep Grand Cherokee



Trouble Code: P1491 You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.


Radiator Fan Control Relay Circuit Malfunction
Possible Causes:


Radiator fan control relay circuit is open or shorted to ground Radiator fan control relay circuit is open (test power to IGN) Radiator fan control relay is damaged or has failed PCM has failed

Nov 10, 2010 | 2003 Jeep Grand Cherokee

2 Answers

My check engine is on and the codes that I get are 35 & 55 - what do these codes mean


code 35 is a problemin the cooling fan relay it is either open or shorted code 55 means end of code output,or to say there are no more codes. Ray

Nov 09, 2009 | 1995 Dodge Intrepid

1 Answer

Plymouth voyager 1994 check engine code 34 35 5


34 = Speed Control Solenoid Circuits: An Open or Shorted Condition has been detected in the Speed Control Vacuum or Vent Solenoid Circuits.
35 = Radiator Fan Relay Circuit: An Open or Shorted Condition has been detected in the Radiator Fan Relay Circuit.
That 5 at the end should have had another 5 after. Did it? 5-blinks and 5-blinks means the system has finished sending the Codes.

Oct 31, 2008 | 1999 Plymouth Grand Voyager

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