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Pinpoint Test P: The Charging System Warning Indicator Is Never/Always On

  1. P1 CHECK THE CHARGING SYSTEM 
    CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
    • Check the charging system operation. Refer to GENERATORS & REGULATORS .
    • Is the charging system operating correctly? 
    1. Yes:  GO to P2.
    2. No:  REFER to GENERATORS & REGULATORS .
  2. P2 CHECK THE CHARGING SYSTEM WARNING INDICATOR WITH THE ENGINE OFF 
    • Key in ON position.
    • Observe the charging system warning indicator.
    • Is the charging system warning indicator on? 
    1. Yes:  GO to  P5 .
    2. No:  GO to P3.
  3. P3 CHECK THE INSTRUMENT CLUSTER INPUT 
    • Key in OFF position.
    • Disconnect: Generator C102c.
    • Connect a fused (10A) jumper wire between the generator C102c pin 1, circuit 904 (LG/RD), harness side and ground.
      Fig 1: Checking Instrument Cluster Input
      G03242536Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the charging system indicator illuminate? 
    1. Yes:  INSTALL a new generator. REFER to GENERATORS & REGULATORS . TEST the system for normal operation.
    2. No:  GO to P4.
  4. P4 CHECK CIRCUIT 904 (LG/RD) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the instrument cluster C220a pin 5, circuit 904 (LG/RD), harness side and the generator C102c pin 1, circuit 904 (LG/RD), harness side.
      Fig 2: Checking Circuit 904 (LG/RD) For Open
      G03242537Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  GO to  P7 .
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  5. P5 CHECK THE GENERATOR 
    • Key in OFF position.
    • Disconnect: Generator C102c.
    • Key in ON position.
    • Does the charging system indicator illuminate? 
    1. Yes:  GO to P6.
    2. No:  INSTALL a new generator. REFER to GENERATORS & REGULATORS . TEST the system for normal operation.
  6. P6 CHECK CIRCUIT 904 (LG/RD) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between the generator C102c pin 1, circuit 904 (LG/RD), harness side and ground.
      Fig 3: Checking Circuit 904 (LG/RD) For Short To Ground
      G03242538Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes:  GO to P7.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  7. P7 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes:  INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER  . TEST the system for normal operation.
    2. No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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