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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1692 (MULTIFUNCTION Electronic Modules) >> Diagnosis And Testing >> Smart Junction Box (SJB) >> Pinpoint Tests >> Pinpoint Test C: DTC B1318 >> Pinpoint Test C: DTC B1318

Pinpoint Test C: DTC B1318

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.
  1. C1 RECHECK THE SJB DTCs 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB Self-Test.
    • Clear the DTCs. Repeat the SJB self-test.
    • Is DTC B1318 still present? 
    • Yes  : GO to  C2.
    • No  : The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.
  2. C2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM 
    • Enter the following diagnostic mode on the scan tool: PCM Self-Test.
    • Retrieve the continuous memory DTCs from the PCM.
    • Is DTC P0620, P0625, P0626 or P065B set in the PCM? 
  3. C3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE 
  4. C4 CHECK THE SJB VOLTAGE SUPPLY 
    • Measure and record the voltage at the battery.
    • Disconnect: SJB C2280G.
    • Ignition ON.
    • Measure the voltage between the SJB C2280G-1, circuit SDC02 (RD), harness side and ground.
      Fig 1: Measuring Voltage Between SJB C2280G-1, Circuit SDC02 (RD) And Ground
      G06070671Courtesy of FORD MOTOR CO.
    • Is the voltage within 0.2 volt of the recorded battery voltage? 
    • Yes  : GO to  C5.
    • No  : REPAIR the circuit for high resistance. CLEAR the DTC. REPEAT the self-test.
  5. C5 CHECK THE SJB GROUND CIRCUIT 
    • Ignition OFF.
    • Disconnect: Negative Battery Cable.
    • Disconnect: SJB C2280D.
    • Measure the resistance between the SJB C2280D-8, circuit GD126 (BK/WH), harness side and ground; and between the SJB C2280D-12, circuit GD126 (BK/WH), harness side and ground.
      Fig 2: Checking SJB Ground Circuit
      G06070672Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : CONNECT the negative battery cable. GO to  C6.
    • No  : REPAIR the circuit for high resistance. CONNECT the negative battery cable. TEST the system for normal operation.
  6. C6 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the SJB connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new SJB. REFER to SMART JUNCTION BOX (SJB)  in this service information. TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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