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Old 19 Nov 2014, 09:01 am
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Default Codes

My grandsons 03 turbo overheated, and a/c does not blow cold. Mechanic said it needed new fan assembly and evaporator to the tune of $1,700. I have since replaced the thermostat, fan assembly, and temperature control assembly. Still overheats, since fan will not turn on.These codes appear; P0033,P0645,P0480,P0443,P0508,P0688,P1105. I went to hugginsnet.com for breakdowns and after each explanation, it read PCM may have failed. Is replacing the PCM the answer?
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Old 19 Nov 2014, 09:25 am
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Default Re: Codes

Please introduce yourself to the forum as soon as you can.

I would suggest working on P0480. Have you checked the radiator relays?
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Old 19 Nov 2014, 10:08 am
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Have not checked relays yet. I thought that the turbo did not have separate relays and received signals from the PCM
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Old 19 Nov 2014, 02:59 pm
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Default Re: Codes

Quote:
Originally Posted by ptcruisersteve View Post
Please introduce yourself to the forum as soon as you can.

I would suggest working on P0480. Have you checked the radiator relays?
Oops You are right. No radiator relays.

Turbo Radiator Fan

The radiator cooling fan is a variable speed electric motor driven fan. The radiator fan assembly includes an electric motor, fan blade, and a support shroud that is attached to the radiator. The radiator fan is serviced as an assembly (fan motor/fan/shroud).

The variable speed radiator fan is controlled by the Powertrain Control Module (PCM) by way of a Pulse Width Modulated (PWM) signal. The duty cycle ranges from 30% for low speed operation then ramps-up to 100% for high-speed operation. This fan control system provides infinitely variable fan speeds, allowing for improved fan noise, A/C performance, better engine cooling, and additional vehicle power.

To control radiator fan operation, the PCM looks at inputs from:

Engine coolant temperature
A/C pressure transducer
Ambient temperature
Vehicle speed
Transmission oil temperature (automatic transmission only)
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Old 19 Nov 2014, 03:34 pm
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Default Re: Codes

When you replaced the fan, did the connector have the same # of pins? The '03 turbo fan is unique. (and the most expensive).
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Old 19 Nov 2014, 04:56 pm
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Default Re: Codes

Yes, we replaced the fan with the same number of pins. Today, we disconnected the battery and reattached it. Then we started the car and all the codes were gone except code P0688. But the fan would not turn on still.
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Old 19 Nov 2014, 05:09 pm
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Default Re: Codes

You might want to check and see if there is a TSB that might indicate reflashing the PCM.
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Old 19 Nov 2014, 05:22 pm
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Default Re: Codes

Sorry to sound stupid, but what is a tsb? Im not a pro at fixing cars, but I am trying to help save some money for my son and grandson. Thank you for all the responses
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Old 19 Nov 2014, 05:51 pm
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Quote:
Originally Posted by jakescruiser View Post
Sorry to sound stupid, but what is a tsb? Im not a pro at fixing cars, but I am trying to help save some money for my son and grandson. Thank you for all the responses
Technical Service Bulletin

Search for TSBs 2003 PT Cruiser GT
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nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge."
Isaac Asimov"

'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in '02 Silver Touring Edition w/87,000 miles
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Old 19 Nov 2014, 09:13 pm
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Default Re: Codes

Quote:
Originally Posted by jakescruiser View Post
Yes, we replaced the fan with the same number of pins. Today, we disconnected the battery and reattached it. Then we started the car and all the codes were gone except code P0688. But the fan would not turn on still.
Engine Trouble Code P0688

Auto Shutdown Relay Control Circuit Low

Possible causes
Weak battery Low voltage while cranking
Faulty Engine Control Module (ECM) relay
ECM fuse
Faulty ECM
ECM harness is open or shorted
ECM circuit poor electrical connection
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