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Pinpoint Test B: P0645:00

WARNING: This page is about a different variant/trim than selected.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. B1 CHECK THE VOLTAGE TO THE A/C (AIR CONDITIONING) CLUTCH RELAY COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect A/C Clutch Relay.
    • Measure:

    Click to display connectors

    Positive Lead Measurement / Action Negative Lead
    Pin 1
    G08065171
    		 -

    Is the voltage greater than 11 volts? 

    1. Yes:  GO to B2
    2. No:  REPAIR the circuit.
  2. B2 SUBSTITUTE A KNOWN GOOD RELAY FOR THE A/C (AIR CONDITIONING) CLUTCH RELAY 
    • Substitute a known good relay for the A/C clutch relay.
    • Using a scan tool, perform PCM self-test.

    Is DTC P0645:00 still present? 

    1. Yes:  GO to B3
    2. No:  INSTALL a new A/C clutch relay.
  3. B3 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect PCM C175B.
    • Ignition ON.
    • Measure:

    Click to display connectors

    Positive Lead Measurement / Action Negative Lead
    Pin 2
    G08065172
    		 -

    Is any voltage present? 

    1. Yes:  REPAIR the circuit.
    2. No:  GO to B4
  4. B4 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure:

    Click to display connectors

    Positive Lead Measurement / Action Negative Lead
    pin 2 Ω -

    Is the resistance greater than 10, 000 ohms? 

    1. Yes:  GO to B5
    2. No:  REPAIR the circuit.
  5. B5 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY CONTROL CIRCUIT FOR AN OPEN 
    • Measure:

    Click to display connectors

    Positive Lead Measurement / Action Negative Lead
    Pin 2 Ω C175B-10

    Is the resistance less than 3 ohms? 

    1. Yes:  GO to B6
    2. No:  REPAIR the circuit.
  6. B6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all the PCM connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect the PCM connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    1. Yes:  CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new PCM.

      For 2.0L Duratec-HE REFER to: POWERTRAIN CONTROL MODULE (PCM) .

      For 2.0L Ecoboost REFER to: POWERTRAIN CONTROL MODULE (PCM) .

    2. No:  The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.
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