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Testing a 2003 PTGT Rad fan...

 
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Old 13 Sep 2015, 10:44 pm
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Default Testing a 2003 PTGT Rad fan...

Does anyone know how to test the Bosch motor for a 2003 PTGT? I have purchased a used motor and it is still not working. It is getting power, but I do not know how to signal it to turn on. Also, how would I test my car to make sure it is sending the signal to turn on the fan? Bad ECU? Ugh, 2003 has been a nightmare, please help!!!
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Old 13 Sep 2015, 11:29 pm
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Location: Pasadena TX
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Default Re: Testing a 2003 PTGT Rad fan...

Unplug the motor from the fan in your car.
Take the new motor and plug it into the pigtail.
Start your engine and turn on the air conditioning, the fan motor should immediately start turn.
Turn off the engine, turn off the a/c. Restart the engine and let it idle watching the temp gauge. The fan motor should begin operating when the temp gauge reaches the center line if the gauge or just before that. Then turn on the a/c and it should speed up.
If that works, replace your dead motor with the good one and enjoy your GT.
This is the procedure my son and I used except we had a complete used Turbo fan assembly and pulled the plug up to the top to plug it in to the fan socket. The fan worked just as we expected it to do so we pulled the n/a fan I have been using for a year and a half and replaced it with the Turbo unit. That was two weeks and four hundred miles ago and it works great. Now I can inspect the car. Just hope the fan will last a few more years. I'll pick up any I find though for spares. I plan on keeping this car until I die.
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Last edited by pasadenahotrod03Dreamer; 16 Sep 2015 at 12:02 am.
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Old 13 Sep 2015, 11:35 pm
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Default Re: Testing a 2003 PTGT Rad fan...

From the 2003 shop manual for the 2.4 liter Turbo:
Harness connector viewed from open end with the locating-locking tab at the top.
Top right is pin #1
Top left is pin #2
Bottom right is pin #3
Bottom left is pin #4
#1- black 10 gauge wire- ground
#2- violet/red 10 gauge wire- battery positive (fusible link)
#3- dark green/orange 16 gauge wire- auto-shutdown relay output
#4- dark blue/dark green 20 gauge wire- radiator fan motor control (part of PCM)
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Last edited by ptcruisersteve; 14 Sep 2015 at 12:45 am.
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Old 14 Sep 2015, 12:19 am
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Default Re: Testing a 2003 PTGT Rad fan...

This is the 2003, there are no relays and it is controlled by the PCM... I have just replaced the fan with a used one I purchased off of eBay and it is still not working. Could something else throw a P0480 code, like if the temperature sensor was not working? I know that has a different code, but the fan did not work after I replaced it and I cannot test it because the PCM sends a signal to turn the fan on and off and what RPM to run at. There is always voltage to the fan once the key is in the on position. So, temperature sensor?
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Old 14 Sep 2015, 12:54 am
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Default Re: Testing a 2003 PTGT Rad fan...

Thanks for reminding me there is no radiator fan relays in the 2003 GT.

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 14 Sep 2015, 01:07 am
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Default Re: Testing a 2003 PTGT Rad fan...

Quote:
Originally Posted by ChazBOT View Post
This is the 2003, there are no relays and it is controlled by the PCM... I have just replaced the fan with a used one I purchased off of eBay and it is still not working. Could something else throw a P0480 code, like if the temperature sensor was not working? I know that has a different code, but the fan did not work after I replaced it and I cannot test it because the PCM sends a signal to turn the fan on and off and what RPM to run at. There is always voltage to the fan once the key is in the on position. So, temperature sensor?
Are you getting the P0480 code? Any other codes?

Does your radiator fan come on if you turn on the AC?

Does the low speed come on when it gets to about 1/2 on your gauge?

Does your high speed come on?
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Old 14 Sep 2015, 01:42 am
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Default Re: Testing a 2003 PTGT Rad fan...

Ill check for other error codes besides 0480 in the morning. The fan does not come on in any of those scenarios. It does not come on at all.
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Old 14 Sep 2015, 06:13 am
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Default Re: Testing a 2003 PTGT Rad fan...

Post #14

New here....and a question
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Old 14 Sep 2015, 08:19 am
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Default Re: Testing a 2003 PTGT Rad fan...

Quote:
Originally Posted by LionPT View Post

The 2003 PTGT is different from every other year. The 2003 PTGT has a Bosch motor 4 pin connector. The only thing I would like to know is how to tell if my PCM is sending a signal to the fan to tell it to turn on.
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Old 14 Sep 2015, 08:25 am
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Default Re: Testing a 2003 PTGT Rad fan...

Are you getting voltage on pin #2 with the ignition off?
Are you getting voltage on pin #3 with the ignition on?
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