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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1410 (Information Center - Instrumentation, Message Center And Warning Chimes) >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AT: DTC B2A20 Or U2472 >> Pinpoint Test At: DTC B2A20 Or U2472

Pinpoint Test At: DTC B2A20 Or U2472

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: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. AT1 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST 
    • Check for recorded IC  DTCs from the self-test.
    • Is DTC B2A20 recorded? 
    • Yes:  GO to  AT3.
    • No:  For DTC U2472, GO to AT2  .
  2. AT2 CHECK THE IC RUN/START VOLTAGE SUPPLY 
    • Ignition OFF.
    • Disconnect: IC  C220.
    • Measure the voltage between the IC  C220-20, circuit CBP29 (WH/VT), harness side and ground.
      Fig 1: Checking IC Run/Start Voltage Supply (1 Of 2)
      G06257929Courtesy of FORD MOTOR CO.
    • Ignition ON.
    • Measure the voltage between the IC  C220-20, circuit CBP29 (WH/VT), harness side and ground.
      Fig 2: Checking IC Run/Start Voltage Supply (1 Of 2)
      G06257929Courtesy of FORD MOTOR CO.
    • Place the key in the START position.
    • Measure the voltage between the IC  C220-20, circuit CBP29 (WH/VT), harness side and ground.
      Fig 3: Checking IC Run/Start Voltage Supply (1 Of 2)
      G06257929Courtesy of FORD MOTOR CO.
    • Is the voltage 0 volts in the OFF position and greater than 10 volts in the RUN and START positions? 
    • Yes:  GO to AT3  .
    • No:  VERIFY the SJB  fuse 29 (5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. TEST the system for normal operation.
  3. AT3 CHECK THE SJB INPUT PIDs FROM THE IGNITION SWITCH 
    • Enter the following diagnostic mode on the scan tool: SJB  DataLogger.
    • Select the SJB  ignition switch ACC (IGN_A_ECU), ignition switch OFF (IGN_O_ECU), ignition switch RUN (IGN_R_ECU), and ignition switch START (IGN_S_ECU) PIDs. Monitor the ignition switch PIDs while cycling the ignition switch from ACC, OFF, RUN and START.
    • Do the SJB PIDs match the ignition switch position? 
  4. AT4 CHECK THE IC DTCs 
    • Enter the following diagnostic mode on the scan tool: IC  Self-Test.
    • Repeat the IC  self-test. Clear the DTCs.
    • Is DTC B2A20 or DTC U2472 still present? 
    • Yes:  GO to AT5  .
    • No:  The system is operating correctly at this time. The DTC may have been set due to high network traffic.
  5. AT5 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB  connectors and make sure they seat correctly.
    • Operate the system and verify that the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

      If the concern remains, REINSTALL the original SJB  and GO to AT6  .

    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  6. AT6 CHECK FOR CORRECT IC OPERATION 
    • Disconnect the IC  connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the IC  connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new IC  . REFER to INSTRUMENT CLUSTER (IC) . 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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