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Pinpoint Test A: DTC C1897 - Steering VAPS Circuit Loop Failure

  1. A1 ISOLATE THE POWER STEERING VALVE SOLENOID 
    WARNING: The electrical power to the air suspension system must be turned off prior to hoisting, jacking, or towing an air suspension vehicle. Failure to do so can result in unexpected inflation or deflation of the air springs, which can result in shifting of the vehicle during these operations. Failure to follow these instructions may result in personal injury.
    1. Turn the air suspension switch OFF.
    2. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to JACKING AND LIFTING .
    3. Disconnect: Power Steering Valve Solenoid C120.
    4. Measure the resistance between the power steering valve solenoid C120 pin 1, circuit 115 (LG/BK), component side and the power steering valve solenoid C120 pin 2, circuit 114 (LB/YE), component side.
      Fig 1: Measuring Resistance Between Power Steering Valve Solenoid C120 Pin 1, Circuit 115 (LG/BK), Component Side And Power Steering Valve Solenoid C120 Pin 2, Circuit 114 (LB/YE), Component Side
      G03878972Courtesy of FORD MOTOR CO.
    5. Is the resistance approximately 6.4 ohms? 
    • Yes  : GO to  A2.
    • No  : INSTALL a new power steering valve solenoid. CLEAR the DTC. REPEAT the self-test to verify the repair.
  2. A2 CHECK THE POWER STEERING VALVE SOLENOID CIRCUITS FOR AN OPEN 
    • Disconnect: Air Suspension Module C2131b.
    • Measure the resistance between the air suspension module C2131b pin 14, circuit 114 (LB/YE), harness side and the power steering valve solenoid C120 pin 2, circuit 114 (LB/YE), harness side; and between the air suspension module C2131b pin 26, circuit 115 (LG/BK), harness side and the power steering valve solenoid C120 pin 1, circuit 115 (LG/BK), harness side.
      Fig 2: Measuring Resistance Between Air Suspension Module C2131b Pin 14 And Power Steering Valve Solenoid C120 Pin 2; And Between Air Suspension Module C2131B Pin 26 And Power Steering Valve Solenoid C120 Pin 1
      G03878974Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  A3.
    • No  : REPAIR the circuit(s) in question. CLEAR the DTC. REPEAT the self-test.
  3. A3 CHECK THE POWER STEERING VALVE SOLENOID CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between the power steering valve solenoid C120 pin 2, circuit 114 (LB/YE), harness side and ground; and between the power steering valve solenoid C120 pin 1, circuit 115 (LG/BK), harness side and ground.
      Fig 3: Measuring Resistance Between Power Steering Valve Solenoid C120 Pin 2, Circuit 114 (LB/YE), Harness Side And Ground; And Between Power Steering Valve Solenoid C120 Pin 1, Circuit 115 (LG/BK), Harness Side And Ground
      G03878975Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : REPAIR the circuit(s) in question. CLEAR the DTC. REPEAT the self-test.
    • No  : GO to  A4.
  4. A4 CHECK THE POWER STEERING VALVE SOLENOID CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between the power steering valve solenoid C120 pin 2, circuit 114 (LB/YE), harness side and the power steering valve solenoid C120 pin 1, circuit 115 (LG/BK), harness side.
      Fig 4: Measuring Voltage Between Power Steering Valve Solenoid C120 Pin 2, Circuit 114 (LB/YE), Harness Side And Power Steering Valve Solenoid C120 Pin 1, Circuit 115 (LG/BK), Harness Side
      G03878976Courtesy of FORD MOTOR CO.
    • Is any voltage indicated? 
    • Yes  : REPAIR the circuit(s) in question. CLEAR the DTC. REPEAT the self-test.
    • No  : GO to  A5.
  5. A5 CHECK THE POWER STEERING VALVE SOLENOID CIRCUITS FOR A SHORT 
    • Key in OFF position.
    • Measure the resistance between the power steering valve solenoid C120 pin 1, circuit 115 (LG/BK), harness side and the power steering valve solenoid C120 pin 2, circuit 114 (LB/YE), harness side.
      Fig 5: Measuring Resistance Between Power Steering Valve Solenoid C120 Pin 1, Circuit 115 (LG/BK), Harness Side And Power Steering Valve Solenoid C120 Pin 2, Circuit 114 (LB/YE), Harness Side
      G03878972Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : INSTALL a new air suspension module. REFER to MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTC. REPEAT the self-test.
    • No  : REPAIR the circuit(s). CLEAR the DTC. REPEAT the self-test.
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