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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (2.9L Pcm 2 - DTCS P0277-00 To P0686-00) >> DTC Troubleshooting >> P0634-00 - Control Module Internal Temperature 1 Too High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK CONNECTIONS ON A/C COMPRESSOR, A/C COMPRESSOR RELAY AND PCM-2 
    1. Check for loose, damaged or corroded connections on the A/C Compressor, on A/C Compressor Relay R2-30A of the front relay base or on the PCM-2.

      Are there any loose or damaged connections?

      Yes 

      No 

      • Go To  2
  2. CHECK OPERATION OF A/C COMPRESSOR RELAY 
    1. Check that the R2-30A A/C Compressor Relay of the front relay base is working correctly.

      Is the operation incorrect of the A/C Compressor Relay?

      Yes 

      • Replace the R2-30A A/C Compressor Relay of the front relay base.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK WIRING BETWEEN A/C COMPRESSOR RELAY AND PCM-2 
    1. Check the wiring for an open circuit or high resistance between A/C Compressor Relay R2-30A of the front relay base and PIN 12 of the vehicle side connector of the PCM-2.

      Is there a high resistance or open condition in the wiring?

      Yes 

      • Repair the open circuit or high resistance in the wiring.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK WIRING BETWEEN A/C COMPRESSOR RELAY AND PCM-2 
    1. Check the wiring for a short circuit between A/C Compressor Relay R2-30A of the front relay base and PIN 12 of the vehicle side connector of the PCM-2.

      Is there a short circuit in the wiring?

      Yes 

      No 

      • Go To  5
  5. CHECK WIRING BETWEEN A/C COMPRESSOR RELAY AND A/C COMPRESSOR 
    1. Check the wiring for an open circuit or high resistance between A/C Compressor Relay R2-30A of the front relay base and the A/C Compressor.

      Is there a high resistance or open condition in the wiring?

      Yes 

      • Repair the open circuit or high resistance in the wiring.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK WIRING BETWEEN A/C COMPRESSOR RELAY AND A/C COMPRESSOR 
    1. Check wiring for a short circuit between A/C Compressor Relay R2-30A of the front relay base and the A/C Compressor.

      Is there a short circuit in the wiring?

      Yes 

      No 

      • Go To  7
  7. CHECK OPERATION OF THE A/C COMPRESSOR 
    1. Check that the A/C Compressor is working properly.

      Is the operation incorrect of the A/C Compressor?

      Yes 

      No