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Pinpoint Test D: DTC B1259 Or DTC B1261 - Solar Radiation Sensor Open Circuit Or Short To Ground

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 CHECK THE SOLAR RADIATION SENSOR RESISTANCE 
    • Key in OFF position.
    • Disconnect: Solar Radiation Sensor C286.
    • Measure the resistance between the solar radiation sensor terminals.
      Fig 1: Checking Solar Radiation Sensor Resistance
      G03924281Courtesy of FORD MOTOR CO.
    • Is continuity present and the resistance greater than 0 ohms? 
    • Yes  : GO to D2.
    • No  : INSTALL a new solar radiation sensor and bracket. TEST the system for normal operation.
  2. D2 CHECK THE EATC MODULE OUTPUT VOLTAGE 
    • Key in ON position.
    • Press the AUTOMATIC button.
    • Measure the voltage between the solar radiation sensor C286 pin A, circuit 217 (DB/OG) and pin B, circuit 57(BK).
      Fig 2: Checking EATC Module Output Voltage
      G03910076Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.7 and 5.1 volts? 
    • Yes  : INSTALL a new EATC module. TEST the system for normal operation.
    • No  : If diagnosing DTC 1259, GO to D3.

      If diagnosing DTC 1261, GO to  D5.

  3. D3 CHECK CIRCUIT 217 (DB/OG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: EATC Module C228a.
    • Measure the resistance between the EATC module C228a pin 20, circuit 217 (DB/OG) and the solar radiation sensor C286 pin A, circuit 217 (DB/OG).
      Fig 3: Checking Circuit 217 (DB/OG) For Open
      G03910077Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to D4.
    • No  : REPAIR circuit 217 (DB/OG) for an open. TEST the system for normal operation.
  4. D4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance between EATC module C228b pin 2, circuit 57 (BK) and solar radiation sensor C286 pin B, circuit 57 (BK).
      Fig 4: Checking Circuit 57 (BK) For Open
      G03924284Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new EATC module. TEST the system for normal operation.
    • No  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
  5. D5 CHECK CIRCUIT 217 (DB/OG) FOR A SHORT TO CIRCUIT 676 (PK/OG) 
    • Key in OFF position.
    • Disconnect: EATC Module C228a.
    • Measure the resistance between the solar radiation sensor C286 pin A, circuit 217 (DB/OG) and pin B, circuit 57 (BK).
      Fig 5: Checking Circuit 217 (DB/OG) For Short To Circuit 676 (PK/OG)
      G03910079Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to D6.
    • No  : REPAIR circuit 217 (DB/OG) for a short to circuit 57 (BK). TEST the system for normal operation.
  6. D6 CHECK CIRCUIT 217 (DB/OG) FOR A SHORT TO GROUND 
    • Measure the resistance between the EATC module C228a pin 20, circuit 217 (DB/OG) and ground.
      Fig 6: Checking Circuit 217 (DB/OG) For Short To Ground
      G03910080Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : INSTALL a new EATC module. TEST the system for normal operation.
    • No  : REPAIR circuit 217 (DB/OG) for a short to ground. TEST the system for normal operation.
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