Pinpoint Test F: DTC B2A20

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 Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

NOTE: Verify that battery voltage is 10 volts or greater.

F1 CHECK THE IGNITION SWITCH MECHANICAL FUNCTION
- Inspect the ignition switch for correct mechanical function. Refer to the IGNITION SWITCH - Mechanical Component Test. See within PINPOINT TEST I: THE IGNITION KEY CAN BE TURNED TO THE OFF POSITION WHEN THE SELECTOR LEVER IS NOT IN PARK
- Did the ignition switch pass the component test?

Yes: GO to F2.
No: INSTALL a new ignition switch. REFER to Removal and Installation . CLEAR the DTCs. REPEAT the self-test.

F2 CHECK THE IGNITION SWITCH ELECTRICAL FUNCTION
- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Carry out the Ignition Switch component test. See within PINPOINT TEST I: THE IGNITION KEY CAN BE TURNED TO THE OFF POSITION WHEN THE SELECTOR LEVER IS NOT IN PARK
  Refer to COMPONENT TESTING (Except Hybrid) and/or COMPONENT TESTING (Hybrid) for component testing.
- Did the ignition switch pass the component test?

Yes: GO to F3.
No: INSTALL a new ignition switch. REFER to Removal and Installation . CLEAR the DTCs. REPEAT the self-test.

F3 CHECK THE SJB START POWER OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Connect: Ignition Switch C250.
- Disconnect: SJB Fuse 28 (5A).
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), circuit CBP28 (GY/VT), output side and ground.
  
  Fig 1: Measuring Voltage Between SJB Fuse 28 (5A) & Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: GO to F10.
No: For non-hybrid vehicles, GO to F4.
For hybrid vehicles, GO to F9.

F4 CHECK THE SJB START POWER INPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Measure the voltage between SJB fuse 28 (5A), circuit CE336 (GN/WH), input side and ground.
  
  Fig 2: Measuring Voltage Between SJB FUSE 28 (5A) & Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: GO to F5.
No: GO to F13.

F5 ISOLATE THE SJB START POWER CIRCUIT
- Ignition OFF.
- Disconnect: BJB One-Touch Integrated Start (OTIS) Diode.
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), circuit CE336 (GN/WH), input side and ground.
  
  Fig 3: Measuring Voltage Between SJB FUSE 28 (5A) & Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: GO to F6.
No: GO to F8.

F6 CHECK THE PCM IGNITION SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280B.
- Ignition ON.
- Measure the voltage between SJB C2280B-32, circuit CE336 (GN/WH), harness side and ground.
  
  Fig 4: Checking Circuit CE336 Or CDC35
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: GO to F7.
No: GO to F13.

F7 CHECK THE PCM FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: PCM C175B.
- Ignition ON.
- Measure the voltage between SJB C2280B-32, circuit CE336 (GN/WH), harness side and ground.
  
  Fig 5: Checking Circuit CE336 Or CDC35
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: REPAIR circuit CE336 (GN/WH). CLEAR the DTCs. REPEAT the self-test.
No: GO to F15.

F8 CHECK THE IGNITION SWITCH START POWER OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: PCM C175B.
- Ignition ON.
- Measure the voltage between BJB OTIS diode, circuit CDC35 (BU/WH), input side and ground.
  
  Fig 6: Checking Circuit CDC35
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: REPAIR circuit CDC35 (BU/WH). CLEAR the DTCs. REPEAT the self-test.
No: GO to F15.

F9 CHECK THE SJB IGNITION SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280B.
- Ignition ON.
- Measure the voltage between SJB C2280B-32, circuit CDC35 (BU/WH), harness side and ground.
  
  Fig 7: Checking Circuit CE336 Or CDC35
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: REPAIR circuit CDC35 (BU/WH). CLEAR the DTCs. REPEAT the self-test.
No: GO to F13.

F10 ISOLATE THE ACM
- Ignition OFF.
- Disconnect: ACM C240A.
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), circuit CBP28 (GY/VT), output side and ground.
  
  Fig 8: Measuring Voltage Between SJB FUSE 28 (5A) & Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: GO to F11.
No: GO to F14.

F11 ISOLATE THE PCM
- Ignition OFF.
- Disconnect: PCM C175B.
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), circuit CBP28 (GY/VT), output side and ground.
  
  Fig 9: Measuring Voltage Between SJB FUSE 28 (5A) & Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: GO to F12.
No: GO to F15.

F12 ISOLATE THE SJB
- Ignition OFF.
- Disconnect: SJBC2280B.
- Ignition ON.
- Measure the voltage between SJB C2280B-2, circuit CBP28 (GY/VT), harness side and ground.
  
  Fig 10: Checking Circuit CBP28
  Courtesy of FORD MOTOR CO.
- Is any voltage present?

Yes: REPAIR circuit CBP28 (GY/VT). CLEAR the DTCs. REPEAT the self-test.
No: GO to F13.

F13 CHECK FOR CORRECT SJB OPERATION
- Ignition OFF.
- Disconnect: All SJB connectors.
- Check the SJB connectors for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: All SJB connectors making sure that they are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes: INSTALL a new SJB . REFER to INSTALLATION . CLEAR the DTCs. REPEAT the self-test.
No: The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

F14 CHECK FOR CORRECT ACM OPERATION
- Disconnect: All ACM connectors.
- Check all ACM connectors for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: All ACM connectors making sure that all connectors are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes: INSTALL a new ACM . REFER to REMOVAL AND INSTALLATION (Fusion, Milan) and/or REMOVAL AND INSTALLATION (MKZ) . CLEAR the DTCs. REPEAT the self-test.
No: The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

F15 CHECK FOR CORRECT PCM OPERATION
- Disconnect: All PCM connectors.
- Check all PCM connectors for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: All PCM connectors making sure that all connectors are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes: INSTALL a new PCM. REFER to INSTALLATION (2.5L) , INSTALLATION (3.0L) , INSTALLATION (3.5L) or INSTALLATION (Hybrid) . CLEAR the DTCs. REPEAT the self-test.
No: The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.