Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

Getting Code 61

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Old Sep 2, 2011 | 11:14 AM
  #1  
bw_hunter's Avatar
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From: Kissimmee, Fl, USA
Getting Code 61

Hi Folks,

I just did a AC system rebuild and replaced all seals, the compressor, the receiver/drier. The system worked great for a week and then simply stopped.

The system is holding refrigerant pressure just fine..

No SES but a scan of the computer yields a code 61. Can anyone define that a little better for me?

Thanks in advance...
Old Sep 3, 2011 | 10:15 AM
  #2  
Injuneer's Avatar
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Re: Getting Code 61

From the 94 shop manual:

The PCM monitors A/C refrigerant pressure and A/C evaporator temperature to determine if the A/C sysstme has adequate regrigerant (R134a) charge. The PCM will disable the A/C clutch whenever A/C refrigerant charge drops below a predetermined value, to reduce the chance of compressor damage. The PCM will cycle the compressor more frequently if the charge is only slightly low.

The PCM determines A/C charge based on the A/C refrigerant pressure and the A/C evaporator tmeperature. The PCM uses these two inputs to calculate A/C refrigerant charge.

DTC 61 will set when: The PCM claculates regrigerant charge to be below a predetermined level.

Action taken: If the PCM determines A/C refrigerant charge to be low, the A/C clutch will be disabled and DTC 61 will be set. DTC 61 will be stored in the PCM memory, but will NOT turn "ON" the MIL.
Old Sep 3, 2011 | 12:14 PM
  #3  
bw_hunter's Avatar
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Re: Getting Code 61

Thanks Injuneer.

I put the gauges on it and found slightly low pressures. I added more refrigerant to get the correct pressures as outlined in the service manual. When I did the original work it was very hot(ambient) and I may not have put in enough.
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