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Pinpoint Test A: No Communication With The Instrument Cluster

  1. A1 CHECK THE BATTERY POWER SUPPLY TO THE INSTRUMENT CLUSTER 
    CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure voltage between the instrument cluster C220b pin 10, circuit 729 (RD/WH), harness side and ground.
      Fig 1: Checking Battery Power Supply To Instrument Cluster
      G03242514Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to A2.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  2. A2 CHECK THE RUN POWER SUPPLY TO THE INSTRUMENT CLUSTER 
    • Key in ON position.
    • Measure the voltage between the instrument cluster C220b pin 11, circuit 489 (PK/BK), harness side and ground.
      Fig 2: Checking Run Power Supply To Instrument Cluster
      G03242515Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to A3.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  3. A3 CHECK THE RUN/START POWER SUPPLY TO THE INSTRUMENT CLUSTER 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Key in ON position.
    • Measure the voltage between the instrument cluster C220b pin 12, circuit 20 (WH/LB), harness side and ground.
      Fig 3: Checking Run/Start Power Supply To Instrument Cluster
      G03242516Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to A4.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK GROUND CIRCUIT 397 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the instrument cluster C220b pin 20, circuit 397 (BK/WH), harness side and ground.
      Fig 4: Checking Ground Circuit 397 (BK/WH) For An Open
      G03242517Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  GO to A5.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  5. A5 CHECK GROUND CIRCUIT 1205 (BK) FOR AN OPEN 
    • Measure the resistance between the instrument cluster C220b pin 1, circuit 1205 (BK), harness side and ground.
      Fig 5: Checking Ground Circuit 1205 (BK) For An Open
      G03242518Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  REFER to MODULE COMMUNICATIONS NETWORK .
    2. No:  REPAIR the circuit. TEST the system for normal operation.
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