P0480 Error - JeepForum.com
 
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post #1 of 10 Old 08-29-2019, 07:51 AM Thread Starter
NavyVet75
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P0480 Error

Sorry, I should have included it does have factory A/C.


Bought this 06 Wrangler, I4 engine, manual.

Has a P0480 Error code happening. Who ever owned it prior to me put in an after market fan, wiring, going to a switch. The dealership I bought it from replaced the fan and cut the wires to the switch allowing the fan to run continuously.

So I know the fan is working and have no problem with air flow.
But I don't like starting a project where someone started and someone else cut wires as a work around.
I'd like suggestions on where to start to get this right, where the error code doesn't come back on.
Suggestions?


Appreciated!


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Last edited by NavyVet75; 08-29-2019 at 01:17 PM.
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post #2 of 10 Old 08-29-2019, 09:50 AM
jtec
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I agree lets get this corrected, return to STOCK wiring. Having a CEL and a code MAY have computer taking action ie cooling fan issue could restrict AC - god forbid !!

Need some time to get and post a wiring diagram - any other codes?

What type of dealer would 'cut' wires and not correct - Was this an authorized jeep dealer?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 10 Old 08-29-2019, 09:59 AM Thread Starter
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No other codes. Just the one.

It was not an authorized dealer.

The previous owner had a fan with a switch on the dash.

The mechanic cut the line to the switch with the new fan and made it so the fan run continuously.

I just called the dealership and they ordered the fan from O'Rielly's Auto Parts.

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post #4 of 10 Old 08-29-2019, 11:38 AM
jtec
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TMI - I would check for 12v at PCM C3 #4

P0480-COOLING FAN NO.1 CONTROL CIRCUIT

Set Condition: An open or shorted circuit is detected in the radiator fan relay control
circuit.
POSSIBLE CAUSES
LOW SPEED RADIATOR FAN RELAY OPERATION
LOW SPEED RADIATOR FAN RELAY
(F20) FUSED IGNITION SWITCH OUTPUT CIRCUIT
(A16) FUSED B+ CIRCUIT
(N201) LOW SPEED RAD FAN RELAY CONTROL CIRCUIT OPEN
(N201) LOW SPEED RAD FAN RELAY CONTROL CIRCUIT SHORTED TO GROUND
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C3  4.jpg  
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 10 Old 08-29-2019, 01:12 PM
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The OEM fan is a 2 speed fan & besides cycling as needed to keep the radiator coolant temp in the normal range it also comes on when the a/c is on, assuming you have a/c.

I’m not exactly sure how the 2 speed process works on this model but likely (educated guessing) the low speed is for coolant temp cycling & high speed is used when the a/c is on & runs constantly.

The PCM controls both functions & with both bypassed either by direct wiring or through a (non OEM) switch the PCM sees this as an open circuit.



I’m guessing you will need the 2 speed fan to get everything working as it should. It is possible the original fan was replaced because it failed but also possible the PCM failed to control it properly causing the fan replacement/rewiring rather than PCM replacement.

Here is the FSM circuit diagram for the fan (2.4, 4 cylinder only).




DO NOT USE THIS DIAGRAM. ERROR IN FSM AS NOTED BELOW!!!
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post #6 of 10 Old 08-29-2019, 03:01 PM
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CAUTION !
be critical if working from the above diagram, The relays are oriented wrong, the control wires D11 and D13 on hi speed relay are reversed, also circuit F102 20 PK/DB does not have a power source.

this code often arises when PCM does NOT see 12v at C3 4. that circuit is wrong and incomplete on the OEM diagram above.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #7 of 10 Old 08-29-2019, 03:47 PM
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Thank you, jtec.



I knew that mistake was in the ’06 FSM, even have that in my “FSM mistakes file. Here is the ’05 diagram which is correct as far as wiring. I’m not sure about wire colors though…




Edit: '05 is correct as far as I know. The circuit would work as diagrammed but not sure if the PCM controls the relays from the power side of the coils or the ground side on the '06s. They changed the diagram presumably for a reason between the '05 & '06 manuals even though it ended up wrong. That would be easy to check on the '06 in question.
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post #8 of 10 Old 08-29-2019, 04:26 PM
jtec
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I have been searching in spare time today - confusion continues...

notice the 06 indicates the low side control goes to PCM C3 #4 where as the 05 shows low side control going to C3 #6...

now if you are comfortable doing wiring no problem - we would just learn by probing...

The PCM grounds the coils, as mentioned the code OFTEN indicates the PCM does not see 12v on the control wire... Probing C3 4 and 6 would be a start -

OR easyier place to start as I posted above check at PDC relay cavities 4 and 13 first - is there 12v?

ANyones head spinning- your not smoking enough

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 10 Old 08-29-2019, 04:52 PM
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It is really confusing. The ’03 FSM only shows the high speed relay & appears that the motor in single speed. The ’04 FSM wiring is like the ’05 but different fuse & PCM pins.

You are right only by probing the various terminal & pins will it be clear exactly how the ’06 (or even the ’03-‘05s) are actually wired & controlled.

What is clear is the PCM controls both speeds.

Other than the diagrams, the circuit is not addressed elsewhere in the FSM as far as I know.

Even if the OP finds the circuit is correct & functional at the relays, I do not think it can be connected to the non-OEM fan unless it has 2 speeds.
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post #10 of 10 Old 08-29-2019, 05:21 PM
jtec
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not always easy is it... we can do this...a test light and common sense*.

I checked the 05 to 06 similarities by looking at 80-50-9 the daytime running module details, and both 05 and 06 PCM connector C3 for same fan control circuits 4 and 6 they are different on the 05 and 06 BUT probing will still id the hi low terminal. C3 4 is hi driver one year and low driver the other year.


*Oh wait - might be Millennials we are dealing with... common sense isn't common

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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