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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2940 (Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnosis And Testing >> Electronic Locking Differential (ELD) System >> Pinpoint Tests >> Pinpoint Test S: DTC P189A:00 >> Pinpoint Test S: DTC P189A:00

Pinpoint Test S: DTC P189A:00

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Make sure the battery is fully charged before carrying out this pinpoint test.
  1. S1 CHECK THE MSS 
    • Ignition OFF.
    • Disconnect: MSS  C284.
    • Set the Mode Select Switch (MSS) in 2H (Electronic Shift-On-The-Fly (ESOF).
    • Set the Mode Select Switch (MSS) in OFF (2-Wheel Drive (2WD) or MSOS  ).
    • Measure the resistance between MSS  C284 pins 1 and 2, component side, while the MSS  is in 2H or OFF position.
      Fig 1: Measuring Resistance Between MSS C284 Pins 1 And 2, Component Side Connector End View
      G07483904Courtesy of FORD MOTOR CO.
    • Are the resistance values between 22-27 ohms? 
    • Yes:  GO to  S2. No INSTALL a new MSS  . REFER to MODE SELECT SWITCH (MSS) . CLEAR the DTCs. TEST the system for normal operation. REPEAT the self-test.
  2. S2 CHECK THE ELD MODE CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: TCCM  C2371A.
    • Measure the resistance between TCCM  C2371A-15, circuit CCF32 (WH/GN), harness side and ground.
      Fig 2: Measuring Resistance Between TCCM C2371A-15 And Ground Connector Terminals
      G07483905Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  S3. No REPAIR circuit CCF32 (WH/GN). CLEAR the DTCs. TEST the system for normal operation. REPEAT the self-test.
  3. S3 CHECK FOR CORRECT TCCM OPERATION 
    • Ignition OFF.
    • Disconnect all TCCM  connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all TCCM  connectors and make sure they are seated correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new TCCM  . REFER to TRANSFER CASE CONTROL MODULE (TCCM) . TEST the system for normal operation. 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. TEST the system for normal operation. REPEAT the self-test.
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