PINPOINT TEST G: DTCs B2844 AND U2472

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.

G1 CHECK THE SJB DTCs
- Use the recorded SJB DTCs from the continuous and on-demand self tests.
- Is DTC B2A20 present?

Yes: Go To PINPOINT TEST F .
No: GO to G2.

G2 CHECK THE IGNITION SWITCH PIDS
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the following ignition switch PIDs while cycling the ignition switch through each position:
  - ECU Derived Ignition State-OFF (IGN_O_ECU)
  - ECU Derived Ignition State-ACC (IGN_A_ECU)
  - ECU Derived Ignition State-RUN (IGN_R_ECU)
  - ECU Derived Ignition State-START (IGN_S_ECU)
- Does each PID display YES when the ignition switch is moved into the corresponding position and NO when the switch is moved to another position?

Yes: The condition is not present at this time. INSPECT SJB connectors C2280A and C2280B for corrosion, spread terminals and/or pushed-out pins. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
No: If IGN_A_ECU is displayed YES at all times, Non-Hybrid: GO to G3. Hybrid: GO to G4.
If IGN_R_ECU is displayed YES at all times, GO to G6.

If IGN_S_ECU displayed YES at all times, Go To PINPOINT TEST F .

If IGN_O_ECU displayed YES at all times, Go To PINPOINT TEST A .

If IGN_A_ECU displayed NO at all times, Go To PINPOINT TEST B .

If IGN_R_ECU displayed NO at all times, Go To PINPOINT TEST C .

If IGN_S_ECU displayed NO at all times, Non-Hybrid: Go To PINPOINT TEST D . Hybrid: Go To PINPOINT TEST E .

G3 CHECK SJB FUSE 43 (10A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 43 (10A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch ACC position PID IGN_A_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G4.
No: REPAIR circuit CBP43 (GY). CLEAR the DTCs. REPEAT the self-test.

G4 CHECK SJB FUSE 45 (5A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 45 (5A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch ACC position PID IGN_A_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G5.
No: REPAIR circuit CBP45 (YE). CLEAR the DTCs. REPEAT the self-test.

G5 CHECK THE IGNITION SWITCH
- 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: REPAIR circuit CDC33 (VT/GN). CLEAR the DTCs. REPEAT the self-test.
No: INSTALL a new ignition switch. REFER to Removal and Installation . TEST the system for normal operation. CLEAR the DTCs. REPEAT the self-test.

G6 CHECK SJB FUSE 44 (10A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 44 (10A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch RUN position PID IGN_R_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G7.
No: REPAIR circuit CBP44 (VT). CLEAR the DTCs. REPEAT the self-test.

G7 CHECK SJB FUSE 42 (10A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 42 (10A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch RUN position PID IGN_R_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G8.
No: REPAIR circuit CBP42 (GN). CLEAR the DTCs. REPEAT the self-test.

G8 CHECK SJB FUSE 29 (5A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 29 (5A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch RUN position PID IGN_R_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G9.
No: REPAIR circuit CBP29 (WH/VT). CLEAR the DTCs. REPEAT the self-test.

G9 CHECK SJB FUSE 46 (7.5A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 46 (7.5A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch RUN position PID IGN_R_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G10.
No: REPAIR circuit CBP46 (WH/BU). CLEAR the DTCs. REPEAT the self-test.

G10 CHECK SJB FUSE 36 (5A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 36 (5A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch RUN position PID IGN_R_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G11.
No: REPAIR circuit CBP36 (BU/BN). CLEAR the DTCs. REPEAT the self-test.

G11 CHECK SJB FUSE 35 (10A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 35 (10A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch RUN position PID IGN_R_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G12.
No: REPAIR circuit CBP35 (YE/GY). CLEAR the DTCs. REPEAT the self-test.

G12 CHECK SJB FUSE 32 (10A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 32 (10A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch RUN position PID IGN_R_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: For hybrid vehicles, GO to G13.
For non-hybrid vehicles, GO to G14.
No: REPAIR circuit CBP32 (GN/VT). CLEAR the DTCs. REPEAT the self-test.

G13 CHECK SJB FUSE 37 (10A) OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB Fuse 37 (10A) (if equipped).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - SJB .
- Monitor the ignition switch RUN position PID IGN_R_ECU while cycling the ignition switch through each position.
- Does the PID display YES when the ignition switch is moved through all switch positions?

Yes: GO to G14.
No: REPAIR circuit SBP37 (WH). CLEAR the DTCs. REPEAT the self-test.

G14 CHECK THE IGNITION SWITCH RUN OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280B.
- Disconnect: SJB C2280E.
- Ignition ON.
- Measure the voltage between SJB C2280E-1, circuit CDC34 (WH/OG), harness side and ground while moving the ignition switch through all switch positions.
  
  Fig 1: Measuring Voltage Between SJB C2280E-1 & Ground
  Courtesy of FORD MOTOR CO.
- Is voltage present when the ignition switch is moved through all switch positions?

Yes: GO to G15.
No: GO to G16.

G15 CHECK THE IGNITION SWITCH
- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Carry out the Ignition Switch component test.
  Refer to COMPONENT TESTING (Except Hybrid) and/or COMPONENT TESTING (Hybrid) for component testing.
- Did the ignition switch pass the component test?

Yes: REPAIR circuit CDC34 (WH/OG). CLEAR the DTCs. REPEAT the self-test.
No: INSTALL a new ignition switch. REFER to Removal and Installation . CLEAR the DTCs. REPEAT the self-test.

G16 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.
- 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 INSTALLATION . CLEAR the DTC. 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.