Pinpoint Test E: DTC B2A20 - Ignition Stuck In Start

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. 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 multi-meter probes.

E1 CHECK THE IGNITION SWITCH MECHANICAL FUNCTION
- Inspect the ignition switch for mechanical function. Refer to the Component Test IGNITION SWITCH - MECHANICAL .
- Is the ignition switch OK?
- Yes: GO to E2 .
- No: INSTALL a new ignition switch. REFER to IGNITION SWITCH . CLEAR the DTCs. REPEAT the self-test.
E2 CHECK THE IGNITION SWITCH FOR A SHORT
- Carry out the Ignition Switch Component Test.
  Refer to COMPONENT TESTING -- F250- F550 for component testing.
- Is the ignition switch OK?
- Yes: GO to E3 .
- No: INSTALL a new ignition switch. REFER to IGNITION SWITCH . CLEAR the DTCs. REPEAT the self-test.
E3 CHECK CIRCUIT CBP28 (GY/VT) FOR A SHORT TO VOLTAGE
- Connect: Ignition Switch C250.
- Disconnect: SJB Fuse 28 (5A).
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), output side and ground.
  
  Fig 1: Measuring Voltage Between SJB Fuse 28 (5A), Output Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: GO to E4 .
- No: GO to E5 .
E4 ISOLATE THE ACM
- Ignition OFF.
- Disconnect: Audio Control Module (ACM) C240A.
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), output side and ground.
  
  Fig 2: Measuring Voltage Between SJB Fuse 28 (5A), Output Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: REPAIR circuit CBP28 (GY/VT). CLEAR the DTC. REPEAT the self-test.
- No: INSTALL a new ACM . REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . CLEAR the DTCs. REPEAT the self-test.
E5 CHECK CIRCUITS CDC35 (BU/WH) AND CDC38 (WH/VT) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: PCM C1232B (diesel engine).
- Disconnect: PCM C175T (gasoline engine).
- Disconnect: Starter Relay.
- Disconnect: OTIS Diode.
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), input side and ground.
  
  Fig 3: Measuring Voltage Between SJB Fuse 28 (5A), Input Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: REPAIR circuit CDC35 (BU/WH) and/or CDC38 (WH/VT). CLEAR the DTCs. REPEAT the self-test.
- No: GO to E6 .
E6 ISOLATE THE PCM
- Connect: PCM C1232B (diesel with OTIS ).
- Connect: PCM C175T (gasoline engine).
- Measure the voltage between SJB fuse 28 (5A), input side and ground.
  
  Fig 4: Measuring Voltage Between SJB Fuse 28 (5A), Input Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES for gasoline engines and ELECTRONIC ENGINE CONTROLS DIESEL ENGINE for diesel engines. CLEAR the DTCs. REPEAT the self-test.
- No: GO to E7 .
E7 ISOLATE THE STARTER RELAY
- Connect: Starter Relay.
- Measure the voltage between SJB fuse 28 (5A), input side and ground.
  
  Fig 5: Measuring Voltage Between SJB Fuse 28 (5A), Input Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: INSTALL a new starter relay. CLEAR the DTCs. REPEAT the self-test.
- No: GO to E8 .
E8 CHECK THE OTIS DIODE FOR A SHORT OR AN OPEN
- Check the diode.
- Is the diode shorted or open?
- Yes: INSTALL a new OTIS diode. CLEAR the DTCs. REPEAT the self-test.
- No: GO to E9 .
E9 CHECK THE SJB CONNECTORS
- Disconnect: SJB C2280E.
- Check SJB connectors C2280B and C2280E for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: SJB C2280B.
- Connect: SJB C2280E.
- Make sure the connectors are seated correctly, then operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new SJB . REFER to MULTIFUNCTION ELECTRONIC MODULES . 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.