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'05 throwing P0480 & P0481 after AC job...?

 
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  #1 (permalink)  
Old 21 Jun 2017, 12:49 pm
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Default '05 throwing P0480 & P0481 after AC job...?

Hey guys...

So a customer of mine brought in their '05 pt touring for a blown evap core. The ac system had been non functional for 2 years. I pulled it apart and replaced the evap core, drier, all o-rings/gaskets.. pulled the system under vacuum for a few hours then sealed it up and let it sit. After 2 hours, no leaks. Recharged the system and had ice cold ac. Everything working great.

Sent the car back to the customer.

Today I get a call that the AC quit working and the car would overheat while sitting still.. check engine light came on.

When the car left, the fans and such were working fine.

I get the car back today.. throwing codes P0480 and P0481 high and low speed control circuit malfunctions.

I pulled both relays and jumped power to them.. both fan speeds work fine. I switched both relays.. no change. Checked under hood fuses and didn't find a problem.

Still going to check fuses under the dash in a few... but what could cause both speeds to fail at one time?
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Old 21 Jun 2017, 12:56 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

fan motor itself
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Old 21 Jun 2017, 12:59 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

Both fan speeds work and the fan doesn't make any odd noises.
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Old 21 Jun 2017, 03:14 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

Fuse #12 under dash labeled (pdc relays) had failed. So.. I can't find much information on it but what all does it power?
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Old 21 Jun 2017, 03:30 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

I would suggest checking your A/C Refrigerant pressure switch.

The PCM turns the radiator fan on based on other inputs from that you might not have checked yet:

1. ECT - Engine Coolant Temperature Sensor
2. A/C Refrigerant Pressure Switch
3. VSS - Vehicle Speed Sensor

Cooling fan relays will be grounded on when:

1. Engine temperature reaches temperature specified
2. A/C clutch is requested
3. Vehicle speed is less then 38 mph
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Old 21 Jun 2017, 03:44 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

Well.. I found out why they weren't working.

Fuse #12 under the dash was blown. Now I need to know what all this feeds (and from what I'm reading.. it's quite a bit). May have nothing to do with the AC at all.

Replaced the fuse and it hasn't popped again... so it is intermittent.
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Old 21 Jun 2017, 04:12 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

Never mind.

Last edited by rsrocket1; 21 Jun 2017 at 05:40 pm. Reason: Just trying help, guess that's not good enough.
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Old 21 Jun 2017, 04:22 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

....... I guess my last 2 posts are being ignored...

The DTC came on because fuse #12 failed which meant no power was going to the relays to control the fans or the ac clutch relay to cycle the compressor.

I jumped the relays to see if the fan was functioning as a test and only a test. I know how common fan failure is on these.. so that was my first check.

I found fuse number 12 blown under the dash. Replaced fuse number 12 and the ac compressor clutch, both fans, etc.. all started working again.

I also know that the number 12 fuse feeds the brake light system and a host of other items.. so there is a short or something in one of those circuits.

AC system is fine.. fans are fine.. relays are fine. I'm going to say there is an issue in the brake light circuit. Will probably start at the lights and work forward.
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Old 21 Jun 2017, 04:38 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

Quote:
Originally Posted by AcIdBuRn02ZTS View Post
....... I guess my last 2 posts are being ignored...

The DTC came on because fuse #12 failed which meant no power was going to the relays to control the fans or the ac clutch relay to cycle the compressor.

I jumped the relays to see if the fan was functioning as a test and only a test. I know how common fan failure is on these.. so that was my first check.

I found fuse number 12 blown under the dash. Replaced fuse number 12 and the ac compressor clutch, both fans, etc.. all started working again.

I also know that the number 12 fuse feeds the brake light system and a host of other items.. so there is a short or something in one of those circuits.

AC system is fine.. fans are fine.. relays are fine. I'm going to say there is an issue in the brake light circuit. Will probably start at the lights and work forward.
If you think you have a problem with your brake lights do they both work when you step on the brakes? The sockets are known to get hot and sometimes the wiring goes bad in back of the sockets. You might want to check and see if the wiring is shorting out.
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Last edited by ptcruisersteve; 21 Jun 2017 at 10:27 pm.
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Old 21 Jun 2017, 10:06 pm
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Default Re: '05 throwing P0480 & P0481 after AC job...?

Quote:
Originally Posted by AcIdBuRn02ZTS View Post
....
I found fuse number 12 blown under the dash. Replaced fuse number 12 and the ac compressor clutch, both fans, etc.. all started working again.....
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File Type: jpg Fuse #12 dash.jpg (35.9 KB, 24 views)
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