Check the condition of the compressor drive belt

Move onto step 1

• Replace the belt Op. 1092G10

End of diagnosis

Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket

• Check that there are no faults in the climate control control unit
• Check that there are no fault in the engine management control unit

Move onto step 2

• Continue according to the instructions for the diagnostic equipment

End of diagnosis

Restore:

• the connection between the climate control control unit and the diagnostic connector
• the climate control control unit supply.
• (Wiring diagram E6020 AIR CONDITIONER ).

End of diagnosis

Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the operation of the compressore relay (in the engine management control unit ambient)

Move onto step 3

• Check and, if necessary, replace the compressor engagement relay

End of diagnosis

• Replace the 4 stage pressure switch Op. 5040B14

End of diagnosis

• Restore the connection between the climate control control unit and the compressor coupling, via the 4 stage pressure switch and the engine management control unit.
• (Wiring diagram E6021 COMPRESSOR ACTIVATION ).

End of diagnosis

Check the operation of the compressor electro-magnet coupling and, in particular, that it is correctly connected to earth

Move onto step 4

• Replace the compressor Op. 5040A20 complete with electro-magnet coupling

End of diagnosis

Check the system pressure: See Test 5040B Air conditioning system (pressures) efficiency test

Move onto step 5

• Locate these leaks Op. 5040A14 , then restore the condition of the circuit

End of diagnosis

Move onto step (see D30)

Check that there are no reasons why the climate control control unit or the engine control unit do not enable the engagement of the cooling circuit.

For more details see DESCRIPTION AND OPERATION: 5040 Air conditioner box and components (see 5040F)

End of diagnosis

Incorrect selection of diagnostic procedure