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Home >> Jeep >> 2021 >> Gladiator Mojave, Part Time T/Case Control, Automatic Trans >> Repair and Diagnosis >> Steering >> Steering Column >> Steering System >> Diagnosis And Testing >> Power Steering Flow And Pressure - Electro-Hydraulic Power Steering (EHPS) >> Flow And Pressure Test

Flow And Pressure Test

  1. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE .
  2. Remove the front skid plate. Refer to PLATE, SKID, REMOVAL AND INSTALLATION .
  3. Assemble Power Steering Analyzer as follows:
    1. Gauge end (inlet) of Flow Meter And Gauge (special tool #6800, Analyzer, Power Steering) - Hose (special tool #6905, Assembly, Hose) (3), Adapter (special tool #10250-2, Adapters, Power Steering) (2).
    2. Valve end (outlet) of Flow Meter And Gauge (special tool #6800, Analyzer, Power Steering) - Hose (special tool #6959, Assembly, Hose) (6), Adapter (special tool #10250-1, Adapters, Power Steering) (5).
  4. Remove power steering pressure line retaining bolt from power steering pump. Separate pressure line fitting from power steering pump.
  5. Connect Adapter (special tool #10250-2, Adapters, Power Steering) (2) to pressure fitting on power steering pump. Tighten retaining bolt to 10 N.m (89 in. lbs.).
  6. Connect power steering pressure hose to Adapter Fitting (special tool #10250-1, Adapters, Power Steering) (5). Tighten retaining bolt to 10 N.m (89 in. lbs.).
  7. Open the test valve completely.
  8. Start the engine and idle long enough to circulate power steering fluid through the flow/pressure test gauge and to get air out of the fluid. Then shut off engine.
  9. Check the fluid level, add fluid as necessary. Start the vehicle and allow it to idle.
  10. The gauge should read below 517 kPa (75 psi), if above, inspect the hoses for restrictions and repair as necessary.
    NOTE:

    Always test for and repair Diagnostic Trouble Codes (DTCs) prior to replacement of the EHPS pump. The EHPS pump will not vary output if there are communication DTCs.

  11. Record the flow meter reading GPM at idle with no steering wheel movement, and again while turning the wheel as fast as possible. The readings should be within specifications. If the readings are below specifications, replace the power steering pump.
    CAUTION:

    The following test procedure involves testing maximum pump pressure output and flow control valve operation. Do not leave the valve closed for more than three seconds as the pump could be damaged.

  12. Close the valve fully three times and record the highest pressure indicated each time. All three readings must be above specifications.
    CAUTION:

    Do not force the pump to operate against the stops for more than 2 to 3 seconds at a time because, pump damage will result.

  13. Open the test valve and turn the steering wheel to the extreme left and right positions three times against the stops. Record the highest pressure reading at each position. Compare the readings and if the pressure readings are not within 690 kPa (100 psi) of each other, the gear is leaking internally and must be replaced.
PUMP SPECIFICATION

SYSTEM RELIEF PRESSURE ± 150 FLOW RATE (GPM)
EHPS 11, 030 kPa (1600 psi) turning steering wheel to wheel stops. Momentarily raise to between 0.5 - 2.8 GPM at idle with rapid steering wheel rotation.
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