Pinpoint Test B: DTC B1676

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: DTC B1676 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended with the accessories on.

NOTE: Carry out a thorough inspection and verification before proceeding with the pinpoint test. Refer to INSPECTION AND VERIFICATION in this service information.

B1 RETRIEVE ALL CMDTCs IN ALL MODULES
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - All CMDTCs.
- Is DTC B1317, B1318 or B1676 present in one or more modules AND DTC P0563, P0620, P0625, P0626 or P065B present in the PCM?
- Yes : REFER to CHARGING SYSTEM -- FUSION, MILAN & MKZ article for diagnosis of the battery and charging system.
- No : GO to B2.
B2 CHECK BATTERY CONDITION
- Ignition OFF.
- Refer to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article and carry out the Battery - Condition Test.
- Does the battery pass the condition test?
- Yes : If the battery passed the condition test, but required a recharge, REFER to CHARGING SYSTEM -- FUSION, MILAN & MKZ article to diagnose the charging system. CLEAR the DTCs. REPEAT the self-test.
  If the battery passed the condition test and did not require a recharge, GO to B3.
- No : INSTALL a new battery. REFER to INSTRUMENTATION, MESSAGE CENTER & WARNING CHIMES -- FUSION, MILAN & MKZ article. CLEAR the DTCs. REPEAT the self-test.
B3 CHECK CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine speed to increase above 2,000 rpm while performing this step or the generator may self excite and result in default charging system output voltage. If engine speed goes above 2,000 rpm, shut the vehicle OFF and restart the engine before performing this step.
- Start the engine.
- Measure the voltage of the battery with and without a load on the charging system as follows:
  - Turn off all accessories and run the engine at 1,500 rpm for a minimum of 2 minutes while measuring battery voltage.
  - Turn on headlights and HVAC fan on high and run engine at 1,500 rpm for a minimum of 2 minutes while measuring battery voltage.
  Fig 1: Checking Charging System Voltage
  Courtesy of FORD MOTOR CO.
- Are the voltages between 13 and 15.2 volts?
- Yes : GO to B4.
- No : REFER to CHARGING SYSTEM -- FUSION, MILAN & MKZ article to diagnose the charging system. CLEAR the DTCs. REPEAT the self-test.
B4 CHECK THE VOLTAGE TO THE ABS MODULE
NOTE: The degas bottle may need to be positioned aside to access the ABS module connector.
- Ignition OFF.
- Disconnect: ABS Module C135.
- Ignition ON.
- Measure the voltage between ground and:
  - ABS module C135-1, SBB08 (VT/RD), harness side.
  - ABS module C135-8, CBP42 (GN), harness side.
  - ABS module C135-32, SBB10 (YE/RD), harness side.
  Fig 2: Checking ABS Module Voltage
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes : GO to B5.
- No : VERIFY BJB fuse 8 (40A) is OK. If OK, REPAIR circuit SBB08 (VT/RD).
  VERIFY SJB fuse 42 (10A) is OK. If OK, REPAIR circuit CBP42 (GN).
  
  VERIFY BJB fuse 10 (30A) is OK. If OK, REPAIR circuit SBB10 (YE/RD).
  
  If any fuse is not OK, REFER to the SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short.
  
  CLEAR the DTCs. REPEAT the self-test.
B5 CHECK CIRCUIT GD123 (BK/GY) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ABS module C135-16, circuit GD123 (BK/GY), harness side and ground.
  
  Fig 3: Checking Circuit GD120 (BK/GN) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : CLEAR the DTCs. REPEAT the self-test. If DTC B1676 is retrieved again, GO to B6.
- No : REPAIR circuit GD123 (BK/GY). CLEAR the DTCs. REPEAT the self-test.
B6 CHECK FOR CORRECT ABS MODULE OPERATION
- Check ABS module C135 for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: ABS Module C135.
- Make sure the connector seats correctly, then operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE in this service information. CLEAR the DTCs. REPEAT the self-test.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.