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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Information Center - Instrumentation, Message Center, & Warning Chimes >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AR: DTC B2A20 Or U2472 >> Pinpoint Test Ar: DTC B2A20 Or U2472

Pinpoint Test Ar: DTC B2A20 Or U2472

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. AR1 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  AR3.
    • No:  For DTC U2472, GO to AR2  .
  2. AR2 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: Measuring Voltage Between IC C220-20 And Ground
      G06077253Courtesy of FORD MOTOR CO.
    • Ignition ON.
    • Measure the voltage between the IC C220-20, circuit CBP29 (WH/VT), harness side and ground.
      Fig 2: Measuring Voltage Between IC C220-20 And Ground
      G06077253Courtesy of FORD MOTOR CO.
    • Place the ignition in the START position.
    • Measure the voltage between the IC C220-20, circuit CBP29 (WH/VT), harness side and ground.
      Fig 3: Measuring Voltage Between IC C220-20 And Ground
      G06077253Courtesy 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 AR3  .
    • No:  VERIFY the SJB fuse 29 (5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  3. AR3 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. AR4 CHECK THE IC DTCs 
    • Clear the DTCs.
    • Repeat the IC self-test.
    • Is DTC B2A20 or U2472 still present? 
    • Yes:  GO to AR5  .
    • No:  The system is operating correctly at this time. The DTC may have been set due to high network traffic.
  5. AR5 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 AR6  .

    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  6. AR6 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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