LEMON Manuals: Even more car manuals for everyone
Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 839 (Instrument Cluster System (F250-F550)) >> Diagnostic Tests >> Instrument Cluster (IC) >> Pinpoint Tests >> Pinpoint Test R: The 4x4 High/Low Range Indicator Is Never/Always On >> Pinpoint Test R: The 4X4 High/Low Range Indicator Is Never/Always On

Pinpoint Test R: The 4X4 High/Low Range Indicator Is Never/Always On

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. R1 CHECK THE INSTRUMENT CLUSTER CONFIGURATION 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command
    • Verify that the instrument cluster is configured for 4WD using as built data. Refer to MODULE CONFIGURATION article.
    • Is the instrument cluster configured for 4WD? 
    1. YES  : Go to  R2 .
    2. NO  : CONFIGURE the instrument cluster. REFER to MODULE CONFIGURATION article. TEST the system for normal operation.
  2. R2 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command
    • Select the instrument cluster warning lamps and chime active command on and off. Observe the 4x4 high and low range indicators.
    • Do the 4x4 high and low range indicators illuminate when selected on and turn off when selected off? 
    1. YES  : If the 4x4 indicator is inoperative, go to  R3 .

      If the 4x4 indicator is always on, go to  R6 .

    2. NO  : Go to  R11.
  3. R3 CHECK THE 4WD CONTROL MODULE OPERATION 
    • Key in OFF position.
    • Disconnect: 4WD Control Module C281b
      • Fig 1: Connecting Fused Jumper Wire
      GF0008185Courtesy of FORD MOTOR CO.
    • Connect a fused (10A) jumper wire between the 4WD control module (4x4 high) C281b-12, circuit 210 (LB), harness side and ground; or between the 4WD control module (4x4 low range) C281b-11, circuit 975 (BN/YE), harness side and ground.
    • Key in ON position.
    • Does the 4x4 indicator illuminate? 
    1. YES  : Go to  R8.
    2. NO  : Go to  R4.
  4. R4 CHECK CIRCUIT 210 (LB) OR CIRCUIT 975 (BN/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b
      • Fig 2: Checking Circuit For Open
      GF0008186Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster (4x4 high) C220b-21, circuit 210 (LB), harness side and the 4WD control module C281b-12, circuit 210 (LB), harness side; or between the instrument cluster (4x4 low range) C220b-22, circuit 975 (BN/YE), harness side and the 4WD control module C281b-11, circuit 975 (BN/YE), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  R5.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  5. R5 CHECK CIRCUIT 210 (LB) OR CIRCUIT 975 (BN/YE) FOR A SHORT TO VOLTAGE 
      Fig 3: Checking Circuit For Voltage
      GF0008187Courtesy of FORD MOTOR CO.
    • If the 4x4 high indicator is inoperative, measure the voltage between the instrument cluster C220b-21, circuit 210 (LB), harness side and ground.
      • Fig 4: Checking Circuit For Voltage
      GF0008188Courtesy of FORD MOTOR CO.
    • If the 4x4 low indicator is inoperative, measure the voltage between the instrument cluster C220b-22, circuit 975 (BN/YE), harness side and ground.
    • Is any voltage indicated? 
    1. YES  : REPAIR the circuit in question. TEST the system for normal operation.
    2. NO  : Go to  R11.
  6. R6 CHECK THE VEHICLE CONTENT 
    • Check the vehicle and determine if it is equipped with a manual shift on the fly system.
    • Is the vehicle equipped with a manual shift on the fly system? 
    1. YES  : Go to  R7.
    2. NO  : Go to  R8.
  7. R7 CHECK THE MODE INDICATOR SWITCH 
    • Disconnect: Mode Select Switch C1177
    • Does the indicator continue to illuminate? 
    1. YES  : Go to  R8.
    2. NO  : INSTALL a new mode select switch. REFER to FOUR WHEEL DRIVE (4WD) SYSTEMS article. TEST the system for normal operation.
  8. R8 CHECK THE 4WD CONTROL MODULE  
    • Key in OFF position.
    • Disconnect: 4WD Control Module C281b
    • Key in ON position.
    • Does the indicator illuminate? 
    1. YES  : Go to  R9.
    2. NO  : Go to  R10.
  9. R9 CHECK CIRCUITS 210 (LB) AND 975 (BN/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b
    • Disconnect: 4WD Control Module C281b
      • Fig 5: Checking Circuit For Short To Ground
      GF0008189Courtesy of FORD MOTOR CO.
    • If the 4x4 high indicator is inoperative, measure the resistance between the instrument cluster C220b-21, circuit 210 (LB), harness side and ground.
      • Fig 6: Checking Circuit For Short To Ground
      GF0008190Courtesy of FORD MOTOR CO.
    • If the 4x4 low indicator is inoperative, measure the resistance between the instrument cluster C220b-22, circuit 975 (BN/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  R11.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  10. R10 CHECK THE 4WD CONTROL MODULE FOR CORRECT OPERATION 
    • Disconnect all the 4WD control module connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the 4WD control module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new 4WD control module. REFER to FOUR WHEEL DRIVE (4WD) SYSTEMS article. 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. TEST the system for normal operation.
  11. R11 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster. 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. TEST the system for normal operation.
scientia non olet · About LEMON Manuals