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Home › Lincoln › 2004 › Navigator 4WD › Repair and Diagnosis › Steering › Power Steering › Steering System-General Information › Diagnosis And Testing › Steering System › Inspection and Verification

Inspection and Verification

CAUTION: Do not hold the steering wheel at the stops for an extended amount of time. Damage to the power steering pump can result.
NOTE: Make the following preliminary checks before repairing the steering system:
  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical damage.
    Fig 1: Visual Inspection Chart
    G02781410Courtesy of FORD MOTOR CO.
    3. NOTE: The 3 areas that should be inspected for possible contamination are the power steering reservoir filter, flow control and pressure relief valve in the pump, and the check valve in the inlet port on the power steering gear (if equipped).
  3. Inspect the power steering fluid for the following conditions:
  4. Check the power steering system for fluid leaks.
    • Check the power steering fluid level.
      NOTE: It may be necessary to add power steering fluid to achieve the correct level.

      With the ignition OFF:

    • Wipe off the power steering pump, power steering pressure hose, power steering return hose, power steering fluid cooler, hose assembly and steering gear.
      • CAUTION: Do not hold the steering wheel at the stops for an extended amount of time. Damage to the power steering pump can occur.
    • Start the engine and turn the steering wheel from stop-to-stop several times and check for leaks.
    • If a fluid leak from the steering line-to-steering gear clamp plate is evident. Refer to POWER STEERING .
  5. Inspect the power steering pressure and return hoses, fittings and O-rings for leaks.
    • If a leak is detected at a power steering pressure or return hose, install a new hose. Refer to STEERING COLUMN .
    • If a leak is detected between a fitting nut, seal the fitting nut using a Teflon® joint seal.
    • If a leak is detected at a fitting or clamp plate, tighten to specification. If leak is still evident, visually inspect the fittings, clamp plate, O-rings, and Teflon® seals. Install new as necessary. Refer to POWER STEERING .
    • If a leak is detected at the power steering reservoir, install a new reservoir. Refer to POWER STEERING .
    • If a leak is detected at a constant tension spring clamp, verify that the hose is fully installed on the fitting and that the hose clamp is correctly positioned. If the leak remains, install a new screw clamp.
    • If a leak is detected at a screw clamp joint, tighten the screw clamp. If the leak remains, inspect the tube end and install a new hose. Refer to POWER STEERING .
    • If a leak is detected at the power steering pump, install a new power steering pump. Refer to POWER STEERING .
    NOTE: To inspect for leaks it may be necessary to remove the squeeze-type clamp from the steering gear boots.
  6. Inspect the power steering gear for leaks. If a leak is detected at the power steering gear, install a new power steering gear. Refer to POWER STEERING .
    Fig 2: External Leak Check - Potential Power Rack-and-Pinion Steering Gear Leak Points
    G02781411Courtesy of FORD MOTOR CO.
  7. If an obvious cause for an observed or reported concern is found, correct the cause before proceeding to the next step.
  8. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel, and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  9. If the diagnostic tool still does not communicate with the vehicle, refer to the scan tool manual. .
  10. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • SCP or ISO; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
    • No response/not equipped for 4WAS module, refer to MODULE COMMUNICATIONS NETWORK .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the 4WAS module.
  11. If the DTCs retrieved are related to the concern, go to 4WAS/VAPS DIAGNOSTIC TROUBLE CODE (DTC) INDEX  to continue diagnostics.
  12. If no DTCs related to the concern are retrieved, go to SYMPTOM CHART  to continue diagnostics.
  13. If the fault is not visually evident, determine the symptom and go to SYMPTOM CHART .
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