Pinpoint Test L: DTC B1318

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 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 DISCONNECT .

L1 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 L2.
- 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.
L2 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?
- Yes: REFER to DIAGNOSTIC TROUBLE CODE (DTC) TABLE .
- No: GO to L3.
L3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
- Ignition OFF.
- Check the battery condition and verify the battery is fully charged. Refer to PINPOINT TEST A: BATTERY CONDITION TEST .
- Is the battery OK and fully charged?
- Yes: GO to L4.
- No: REFER to CHARGING SYSTEM .
L4 CHECK THE SJB VOLTAGE SUPPLY
- Measure and record the voltage at the battery.
- Disconnect: SJB C2280g.
- 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) & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage within 0.2 volt of the recorded battery voltage?
- Yes: GO to L5.
- No: REPAIR the circuit for high resistance. CLEAR the DTCs. REPEAT the self-test.
L5 CHECK THE SJB GROUND CIRCUITS
- 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: Measuring Resistance Between SJB C2280D-8, Circuit GD126 (BK/WH) & SJB C2280D-12, Circuit GD126 (BK/WH)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: CONNECT the negative battery cable. GO to L6 .
- No: REPAIR the circuit for high resistance. CONNECT the negative battery cable. TEST the system for normal operation.
L6 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 Installation . 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.