Flow And Pressure Test
- Raise and support the vehicle.
- Remove the left front wheel.
- Remove the inner fender. Refer to Body/Exterior/SHIELD, Splash - Description
- Connect Power Steering Adapter 6825A (6) to the Power Steering Analyzer 6815 test valve hose (3).
- Connect Adapter 6826 (2) to the Power Steering Analyzer 6800 pressure gauge hose (5).
- Disconnect the power steering high pressure hose (7) from the power steering pump line (1).
- Connect the power steering pump line (1) to Adapter 6826 (2).
- Connect the steering gear hose (7) to the Power Steering Adapter 6825A (6).
- Open the test valve completely.
- 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.
- Check the fluid level, add fluid as necessary. Start the vehicle and allow it to idle.
- The gauge should read below 862 kPa (125 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 Electric Power Steering (EPS) pump. The EPS pump will not vary output if there are communication DTCs.
- 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.
- Close the valve fully three times and record the highest pressure indicated each time. All three readings must be above specifications and within 345 kPa (50 psi) of each other. 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.
- If the pressures are above specifications but not within 345 kPa (50 psi) of each other, replace the pump.
- If the pressures are within 345 kPa (50 psi) of each other but below specifications, replace pump.
- 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 to the pump specifications chart. If the pressure readings are not within 50 psi of each other, the gear is leaking internally and must be replaced.
PUMP SPECIFICATION
| ENGINE | RELIEF PRESSURE ± 50 | FLOW RATE (GPM) |
|---|---|---|
| 5.7 (HEV) | 12411 kPa (1800 psi) | 0.5 - 1.0 GPM at idle with no steering wheel rotation. |
| 5.7 (HEV) | 12411 kPa (1800 psi) turning steering wheel to wheel stops. | Momentarily raise to between 1.0 - 2.4 GPM at idle with rapid steering wheel rotation. |