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DTC P0620

NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.
NOTE: Do not have a battery charger attached during vehicle testing.
  1. H1 CHECK THE BATTERY CONDITION 
    • Check the battery condition and state of charge.

      REFER to: BATTERY .

    Does the battery pass the condition test? 

    • Yes  : GO to H2 
    • No  : CHARGE or INSTALL a new battery as necessary.

      REFER to: BATTERY .

  2. H2 CHECK THE GENERATOR CONNECTIONS 
    • Ignition OFF.
    • Disconnect all of the generator connectors and inspect for:
      • 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 generator connectors. Make sure they seat and latch correctly.
    • Measure and record:
      Positive Lead Measurement/Action Negative Lead
      G08063852
      		 VOLTAGE
      G08056406
    • For the 1.6L EcoBoost without Auto-start-stop or the 2.0L EcoBoost, measure:
      Positive Lead Measurement/Action Negative Lead
      C1558C-1  VOLTAGE Ground
    • For all other engines, measure:
      Positive Lead Measurement/Action Negative Lead
      C102C-1  VOLTAGE Ground

    Is the voltage within 0.5 volt of the recorded battery voltage? 

  3. H3 CHECK THE VOLTAGE DROP IN THE GENERATOR B+ CIRCUIT 
    • Start the engine.
    • For the 1.6L EcoBoost without Auto-start-stop or the 2.0L EcoBoost, with the engine running at idle, headlamps on and blower on high, measure:
      Positive Lead Measurement/Action Negative Lead
      C1558C-1  VOLTAGE  
    • For all other engines, with the engine running at idle, headlamps on and blower on high, measure:
      Positive Lead Measurement/Action Negative Lead
      C102C-1  VOLTAGE  
    • Perform a wiggle test of the generator wiring and connections while measuring voltage drop.

    Is the voltage drop less than 0.5 volt? 

    • Yes  : GO to H4 
    • No  : INSPECT and REPAIR any corrosion in the generator B+ circuit or positive battery cable connections.
  4. H4 "A" SENSE CIRCUIT LOAD TEST 
    NOTE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table . To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
    NOTE: This step puts a load on the "A" sense circuit. If there are corroded or loose connections, loading the circuit may help show the fault. A 250-350 mA incandescent 12-volt test lamp is required for this step. This circuit cannot be loaded correctly using an LED-style test lamp.
    • Ignition OFF.
    • Disconnect Generator C1558A  (1.6L EcoBoost without Auto-start-stop or 2.0L EcoBoost).
    • Disconnect Generator C102A  (All other engines).
    • Ignition ON.
    • For the 1.6L EcoBoost without Auto-start-stop or the 2.0L EcoBoost, install a test lamp between:
      Positive Lead Measurement/Action Negative Lead
      C1558A-3  TEST LAMP Ground
    • For all other engines, install a test lamp between:
      Positive Lead Measurement/Action Negative Lead
      C102A-3  TEST LAMP Ground

    Does the test lamp illuminate? 

  5. H5 CHECK THE GENERATOR COMMAND CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect PCM C175B  (1.6L EcoBoost).
    • Disconnect PCM C1381B  (2.0L EcoBoost).
    • Disconnect PCM C1551B  (2.5L Duratec).
    • For the 1.6L EcoBoost without Auto-start-stop or the 2.0L EcoBoost, measure:
      Positive Lead Measurement/Action Negative Lead
      C1558A-2  VOLTAGE Ground
    • For all other engines, measure:
      Positive Lead Measurement/Action Negative Lead
      C102A-2  VOLTAGE Ground

    Is any voltage present? 

    • Yes  : REPAIR the circuit.
    • No  : GO to H6 
  6. H6 CHECK THE GENERATOR COMMAND CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • For the 1.6L EcoBoost without Auto-start-stop or the 2.0L EcoBoost, measure:
      Positive Lead Measurement/Action Negative Lead
      C1558A-2  OHM Ground
    • For all other engines, measure:
      Positive Lead Measurement/Action Negative Lead
      C102A-2  OHM Ground

    Is the resistance greater than 10, 000 ohms? 

    • Yes  : GO to H7 
    • No  : REPAIR the circuit.
  7. H7 CHECK THE GENERATOR COMMAND CIRCUIT FOR AN OPEN 
    • For the 1.6L EcoBoost with Auto-start-stop, measure:
      Positive Lead Measurement/Action Negative Lead
      C1232B-59  OHM C102A-2 
    • For the 1.6L EcoBoost without Auto-start-stop, measure:
      Positive Lead Measurement/Action Negative Lead
      C1232B-59  OHM C1558A-2 
    • For the 2.0L EcoBoost, measure:
      Positive Lead Measurement/Action Negative Lead
      C1381B-59  OHM C1558A-2 
    • For the 2.5L Duratec, measure:
      Positive Lead Measurement/Action Negative Lead
      C1551B-53  OHM C102A-2 

    Is the resistance less than 3 ohms? 

    • Yes  : GO to H8 
    • No  : REPAIR the circuit.
  8. H8 COMPARE THE GENERATOR MONITOR (GENMON) AND GENERATOR COMMAND (GENCMD) PIDS 
    • Ignition OFF.
    • Connect PCM C175B  (1.6L EcoBoost).
    • Connect PCM C1381B  (2.0L EcoBoost).
    • Connect PCM C1551B  (2.5L Duratec).
    • For the 1.6L EcoBoost without Auto-start-stop or the 2.0L EcoBoost, connect:
      Positive Lead Measurement/Action Negative Lead
      C1558A-1  FUSED JUMPER WIRE C1558A-2 
    • For all other engines, connect:
      Positive Lead Measurement/Action Negative Lead
      C102A-1  FUSED JUMPER WIRE C102A-2 
    • Start the engine.
    • Enter the following diagnostic mode: DataLogger - PCM  .
    • Monitor the PCM  Parameter Identifications (PIDs) GENMON and GENCMD.
    • Perform a wiggle test of the generator wiring and connections.

    Do the Parameter Identifications (PIDs) read within 5% of each other? 

  9. H9 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all 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? 

    • Yes  : CHECK OASIS  for any applicable Technical Service Bulletins (TSBs). If a TSB  exists for this concern, DISCONTINUE this test and FOLLOW the TSB  instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new PCM  . For 1.6L EcoBoost, REFER to: POWERTRAIN CONTROL MODULE (PCM) - 1.6L EcoBoost (132kW/180PS) - Sigma .

      For 2.0L EcoBoost, REFER to: POWERTRAIN CONTROL MODULE (PCM) - 2.0L EcoBoost (184kW/250PS) - MI4 .

      For 2.5L Duratec REFER to: POWERTRAIN CONTROL MODULE (PCM) - 2.5L Duratec (125kW/170PS) .

      CLEAR all Diagnostic Trouble Codes (DTCs) in all modules.

    • 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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