Question about 2002 Chevrolet TrailBlazer

1 Answer

Eng. code P1484

I have a check eng. light in spring & summer only when outside air temp. is above 70-75 deg. It happens when the cruse is on. The light comes on and the cruse kicks off and will not reset. The trouble code is P1484. Got any ideas. Woody

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Chevrolet Master
  • 3,854 Answers

P1484 - Cooling Fan System Performance

06-06-2005, 10:51 PMHere's what the GM Manual says about this code:

The cooling fan relay sends a pulse width modulation (PWM) signal of 12-14 volts to the cooling fan clutch through the cooling fan clutch supply voltage circuit. The powertrain control module (PCM) uses this PWM signal in order to control the speed of the cooling fan clutch. The signal controls the position of the oil control valve inside the cooling fan clutch. If the cooling fan RPM is different than the PCM is expecting, DTC P1484 will set. The actual cooling fan RPM vs the desired cooling fan RPM is not always exactly the same. There can be up to an 800-RPM difference.

The engine is running.
The system voltage is greater than 8.5 volts.
The intake air temperature (IAT) is greater than -7°C (19°F).
DTCs P1481 and P1482 are not set.
The engine speed is less than 3200 RPM.
The engine speed is not changing more than 250 RPM for 5 seconds.
Fan command is greater than 0%.


The maximum allowable error of 1000 RPM in the cooling fan speed occurs for 100 seconds.
The PCM detects that the cooling fan clutch is locked up.


The Reduced Engine Power indicator illuminates only if the PCM detects that the cooling fan clutch is locked up.
The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
The PCM will store the conditions as Freeze Frame/Failure Records data.
The PCM commands the cooling fan clutch to 100%.

Important
Follow this procedure in order to clear DTC P1484 after completing a repair.



Use the Clear DTC Information function on the scan tool.
Perform an ignition key cycle.
The PCM turns OFF the MIL after the third consecutive trip that the diagnostic test has run and passed.

The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

An inline connector could cause an intermittent DTC. Ensure to test for poor connections and pin retention at all inline connectors. Refer to system schematics for connector and locations.
If the condition is not present, refer to Testing for Intermittent and Poor Connections in Wiring Systems.

Disconnect the harness connector of the cooling fan clutch from the shroud. Inspect the exposed wires between the harness connector and the tubing.
If DTCs P1484 and P0113 are set, and the weather conditions are cold, the cooling fan code may be false. Clear DTC P1484, and after an IAT sensor check, allow the DTC to reset .

I'd say that 'fan clutch is faulty' is your problem, based on the information you gave. Thank you for using Fixya and good luck

Posted on Jul 10, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have mits triton nov 2009 4x4 the ambient p0072 makes the eng light come on but it does not have that sensor so I need to know if any knows the colour so I can check wiring thanks


code p 0072 refers to outside air temp sensor ( ambient temp sensor--low input===causes ---wiring short to ground, outside air temp sensor ---ECM
thee has to be an ambient temp sensor as that reports the temp to the ECM to adjust the air/fuel settings for cold starts
it could be in the MAF/VAF sensor area

Apr 29, 2017 | Cars & Trucks

1 Answer

Horn doesnt work after re-pack of airbag


The horn, cruse control and air bag each get power from the clock spring and each have a wire plugged no to it. The horn wire is probably not connected. When the clock spring breaks the horn and cruse control stop working and the air bag light stays on.

Apr 21, 2014 | 2002 Chevrolet Monte Carlo

1 Answer

I have a 2007 Chevy Expreess 1500 van. When ambient temperature drops below say 80f outside I get a P0128 check eng code. If during the day the ambient temp raises above 8-85f the light will go out...


P0128 is a generic code to indicate that the engine isn't reaching proper temp. If it has
the Vortec 4.3 like my S-10 is (I am having a similar problem). Check the overflow
tank as the tube will come off and allow air into the system, also check the radiator
coolant level under the cap. The third item is the intake manifold gasket, check for
seepage. If all these things are good I would replace the thermostat (my S-10 had one
sticking which could actually be seen on the temp gage, it wasn't reaching the normal
195 degrees). If you have the temp gage on your dash watch for low temperature to
indicate a bad thermostat, luckily it sounds as if yours is sticking open as mine did.
Hope this helps.

Mar 26, 2011 | Chevrolet 1500 Cars & Trucks

2 Answers

Engine temp goes up to 230 degrees


It's actually normal for engine temps to go up to 220 deg. F or 230 deg. F in the summer time, even in normal engines that run at 196 deg. F typically.

This happened to me with no malfunctions on my 1997 Cadillac Deville, yesterday.

Actually, engines run more efficiently at higher temperatures like this.

Just make sure your coolant is topped off and that it fluctuates between lower temperatures and this high reading.

This is a normal temperature in my experience for GM vehicles.

Aug 11, 2010 | 2002 GMC Envoy

1 Answer

Ac not cooling properly


THE 1ST THING U DO IS VERIFY THE SYSTEM IS FULLY CHARGED, WHAT IS THE LOW SIDE LINE PRESSURE? SHOULD BE AROUND 28 PSI WHEN COMPRESSOR IS ENGAGED.

Jun 24, 2009 | 1995 Honda Accord

1 Answer

Air conditioner problem


you might want to get all your hoses checked out they might have a slow leak that will cause the freon to seep out threw out the day

Jan 31, 2009 | 2001 BMW 325

1 Answer

Possible Computer Problem


Its sounds like your engine wormed-up.

Jun 10, 2008 | 2000 Lincoln Town Car

Not finding what you are looking for?
2002 Chevrolet TrailBlazer Logo

1,648 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

75051 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7726 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...