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Pinpoint Test B: DTC 1897 - Steering VAPS Circuit Loop Failure

  1. B1 CHECK CIRCUITS 412 (OG/LB) AND 413 (LG) FOR SHORT TO BATTERY 
    • Disconnect: Air Suspension Control Module C2131b.
    • Disconnect: VAPS Actuator C120.
    • Key in ON position.
    • Measure the voltage between 4WAS module C2131b pin 21, circuit 413 (LG), harness side and ground and between 4WAS module C2131b pin 22, circuit 412 (OG/LB), harness side and ground.
      Fig 1: Checking Circuits 412 (OG/LB) And 413 (LG) For Short To Battery
      G03928883Courtesy of FORD MOTOR CO.
    • Is any voltage present?
    • Yes  : REPAIR the circuit in question. CLEAR the DTC. REPEAT the self-test.
    • No  : GO to B2.
  2. B2 CHECK CIRCUITS 412 (OG/LB) AND 413 (LG) FOR AN OPEN 
    • Key in OFF position.
    • Raise the vehicle on a hoist. For additional information, refer to JACKING & LIFTING .
      Fig 2: Checking Circuits 412 (OG/LB) And 413 (LG) For An Open
      G03928884Courtesy of FORD MOTOR CO.
    • Measure the resistance between 4WAS module C2131b pin 22 and VAPS actuator C120 pin 1, circuit 412 (OG/LB) and between 4WAS module C2131b pin 21 and VAPS actuator C120 pin 2, circuit 413 (LG).
    • Are the resistances less than 5 ohms?
    • Yes  : GO to B3.
    • No  : REPAIR the affected circuit(s). CLEAR the DTC. REPEAT the self-test.
  3. B3 CHECK CIRCUITS 412 (OG/LB) AND 413 (LG) FOR A SHORT TO GROUND 
    • Measure the resistance between the 4WAS module C4131b pin 22, circuit 412 (OG/LB), harness side and ground; and between the 4WAS module C2131b pin 21, circuit 413 (LG), harness side and ground.
      Fig 3: Checking Circuits 412 (OG/LB) And 413 (LG) For Short To Ground
      G03928885Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms?
    • Yes  : GO to B4.
    • No  : REPAIR the circuit in question. CLEAR the DTC. REPEAT the self-test.
  4. B4 CHECK CIRCUITS 412 (OG/LB) AND 413 (LG) FOR A SHORT TOGETHER 
    • Measure the resistance between VAPS actuator C120 pin 1 and pin 2, harness side.
      Fig 4: Checking Circuits 412 (OG/LB) And 413 (LG) For Short Together
      G03878972Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms?
    • Yes  : GO to B5.
    • No  : REPAIR the circuit in question. CLEAR the DTC. REPEAT the self-test.
  5. B5 CHECK VAPS ACTUATOR FOR SHORT TO GROUND 
    • Measure the resistance between VAPS actuator C120 pin 1, component side and ground and between VAPS actuator C120 pin 2, component side and ground.
      Fig 5: Checking VAPS Actuator For Short To Ground
      G03928887Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to B6.
    • No  : INSTALL a new steering gear. REFER to POWER STEERING . CLEAR the DTC. REPEAT the self-test.
  6. B6 CHECK VAPS ACTUATOR FOR AN OPEN 
    • With the steering gear at room temperature, measure the resistance between the VAPS actuator C120 pin 1 and pin 2, component side.
      Fig 6: Checking VAPS Actuator For An Open
      G03878972Courtesy of FORD MOTOR CO.
    • Is the resistance between 4 and 8 ohms?
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