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Pinpoint Test Al: DTC B1318

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, BATTERY MOUNTING & BATTERY CABLES article.
  1. AL1 RECHECK THE IC DTCs 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: IC Self-Test.
    • Clear the DTCs. Repeat the IC self-test.
    • Is DTC B1318 still present? 
      • Yes  : GO to AL2.
      • No  : The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.
  2. AL2 CHECK THE CHARGING SYSTEM DTCs IN THE PCM 
    • Enter the following diagnostic mode on the scan tool: PCM Self-Test.
    • Retrieve the continuous memory DTCs from all modules.
    • Is DTC P0620, P0622, P0625, P0626 or P065B set in the PCM? 
  3. AL3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE 
  4. AL4 CHECK THE IC VOLTAGE INPUT 
    • Ignition ON.
    • Measure and record the voltage at the battery.
    • Enter the following diagnostic mode on the scan tool: IC DataLogger.
    • Monitor the IC voltage PID (VBAT_1).
    • Is the voltage within 0.2 volt of the recorded battery voltage? 
      • Yes  : GO to  AL7.
      • No  : GO to AL5.
  5. AL5 CHECK THE IC VOLTAGE SUPPLY 
    • Ignition OFF.
    • Disconnect: IC C220.
    • Ignition ON.
    • Measure the voltage between the IC C220-19, circuit SBP26 (YE/RD), harness side and ground.
      Fig 1: Measuring Voltage Between IC C220-19, Circuit SBP26 (YE/RD) And Ground
      G06262809Courtesy of FORD MOTOR CO.
    • Is the voltage within 0.2 volt of the recorded battery voltage? 
      • Yes  : GO to AL6.
      • No  : REPAIR the circuit for high resistance. CLEAR the DTC. REPEAT the self-test.
  6. AL6 CHECK THE IC GROUND CIRCUITS 
    • Ignition OFF.
    • Disconnect: Negative Battery Cable.
    • Measure the resistance between the IC C220-9, circuit GD134 (BK/VT), harness side and ground.
      Fig 2: Measuring Resistance Between IC C220-9, Circuit GD134 (BK/VT) And Ground
      G06257921Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to AL7.
      • No  : REPAIR the circuit for high resistance. TEST the system for normal operation.
  7. AL7 CHECK FOR CORRECT IC OPERATION 
    • Disconnect the IC connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the IC connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
      • Yes  : INSTALL a new IC. REFER to INSTRUMENT CLUSTER (IC) .. 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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