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Pinpoint Test Ab: DTC B1318 Or DTC U3003:16 (ACM)

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .
  1. AB1 RECHECK THE ACM DTCs 
    • Ignition ON.
    • Clear the ACM  DTCs.
    • Wait at least 15 seconds.
    • Repeat the ACM  self-test.
    • Is DTC B1318 or DTC U3003:16 still present? 
    • Yes:  GO to AB2  .
    • No:  The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.
  2. AB2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM 
    • Retrieve the continuous DTCs from all modules.
    • Is DTC P0620, P0622, P0625 or P065B set in the PCM? 
  3. AB3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE 
    • Check the battery condition and verify that the battery is fully charged. Refer to BATTERY, MOUNTING AND CABLES .
    • Is the battery OK and fully charged? 
  4. AB4 CHECK THE ACM VOLTAGE SUPPLY 
    • Ignition OFF.
    • Measure and record the voltage at the battery.
    • Disconnect: ACM  C240a.
    • Ignition ON.
    • Measure the voltage between the ACM  C240a-1, circuit SBP39 (WH/RD), harness side and ground.
      Fig 1: Measuring Voltage Between ACM C240A-1, Circuit SBP39 (WH/RD), Harness Side And Ground
      G06063134Courtesy of FORD MOTOR CO.
    • Is the voltage at the ACM within 0.2 volt of the recorded battery voltage? 
    • Yes:  GO to AB5  .
    • No:  REPAIR the circuit for high resistance. CLEAR the DTCs. REPEAT the self-test.
  5. AB5 CHECK THE ACM GROUND CIRCUIT 
    • Ignition OFF.
    • Disconnect: Negative Battery Cable.
    • Measure the resistance between the ACM  C240a-13, circuit GD115 (BK/GY), harness side and ground.
      Fig 2: Measuring Resistance Between ACM C240A-13, Circuit GD115 (BK/GY), Harness Side And Ground
      G06065472Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to AB6  .
    • No:  REPAIR the circuit for high resistance. CLEAR the DTCs. REPEAT the self-test.
  6. AB6 CHECK FOR CORRECT ACM OPERATION 
    • Ignition OFF. Yes
    • Connect: Negative Battery Cable.
    • Disconnect all the ACM  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the ACM  connectors and make sure they seat correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new ACM  . REFER to AUDIO CONTROL MODULE (ACM) . 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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