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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster (Ic), Message Center, And Warning Chimes >> Diagnostic Tests >> Instrument Cluster (IC), Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AB: DTC B2844 - Ignition Fault >> Pinpoint Test Ab: DTC B2844 - Ignition Fault

Pinpoint Test Ab: DTC B2844 - Ignition Fault

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. AB1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER (IC) SELF-TESTS 
    • Check for recorded instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
    • Is DTC B1352 recorded? 
    1. YES  : Go to Pinpoint Test AI .
    2. NO  : Go to  AB2.
  2. AB2 CHECK CIRCUIT CBP20 (YE/VT) FOR VOLTAGE WITH THE IGNITION SWITCH IN THE ACC POSITION 
    • Key in OFF position.
    • Disconnect: Instrument Cluster (IC) C220
    • Key in ACCESSORY position.
      • Fig 1: Checking Circuit CBP20 (YE/VT) For Voltage With Ignition Switch In ACC Position
      GF0030397Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument cluster (IC) C220-20, circuit CBP20 (YE/VT), harness side and ground.
    • Is the voltage greater than 10 volts with the ignition switch in the ACC position? 
    1. YES  : REFER to STEERING COLUMN SWITCHES article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  AB3.
  3. AB3 CHECK CIRCUIT CBP20 (YE/VT) FOR VOLTAGE WITH THE IGNITION SWITCH IN THE RUN OR START POSITION 
    • Key in OFF position.
    • Disconnect: PCM Power Relay
    • Key in ON position.
      • Fig 2: Checking Circuit CBP20 (YE/VT) For Voltage With Ignition Switch In Run Or Start Position
      GF0030397Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument cluster (IC) C220-20, circuit CBP20 (YE/VT), harness side and ground.
    • Place the ignition switch in the START postion.
      • Fig 3: Measuring Voltage Between Instrument Cluster (IC) C220-20, Circuit CBP20 (YE/VT) (START Postion)
      GF0030397Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument cluster (IC) C220-20, circuit CBP20 (YE/VT), harness side and ground.
    • Key in OFF position.
      • Fig 4: Measuring Voltage Between Instrument Cluster (IC) C220-20, Circuit CBP20 (YE/VT) (OFF Postion)
      GF0030397Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument cluster (IC) C220-20, circuit CBP20 (YE/VT), harness side and ground.
    • Is the voltage greater than 10 volts with the ignition switch in the RUN and the START position, and does the voltage drop to 0 volts when the ignition switch is turned to the OFF position? 
    1. YES  : Go to  AB4.
    2. NO  : REFER to STEERING COLUMN SWITCHES article to diagnose the ignition switch circuits.
  4. AB4 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
    • Disconnect the instrument cluster (IC) connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster (IC) connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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