Ford 2003 Mustang Workshop Manual page 726

On some vehicles, the power steering pump high pressure port is inaccessible and the
special tool should then be installed either at the steering gear or at a point in the high
pressure line between the power steering pump and the steering gear.
2. Place a dial thermometer in the power steering pump reservoir.
3. Check the power steering fluid level. If necessary, add power steering fluid.
Use Motorcraft MERCON® Multi-Purpose ATF XT-2-QDX or MERCON® equivalent.
4. Install a digital tachometer.
5. CAUTION: Do not hold the steering wheel against the stops for more than three to
five seconds at a time. Damage to the power steering pump will occur.
Start the engine. Place the transmission in neutral. Set the parking brake. Raise the power
steering fluid temperature to 74-80°C (165-175°F) by rotating the steering wheel fully to the left
and right several times.
6. Set the engine speed to 1500 rpm. Record the flow rate and pressure readings.
If the flow rate is below the flow rate specification, a new power steering pump may need
to be installed. Continue with the test procedure.
If the pressure reading is above the maximum pressure specification, then check power
steering hoses for kinks and restrictions.
7. Partially close the gate valve to obtain 750 psi. Set the engine speed at idle. Record the flow
rate.
If the flow is less than the specified flow rate, then install a new power steering pump. For
additional information, refer to
8. CAUTION: Do not allow the gate valve to remain closed for more than 5 seconds.
Completely close and partially open the gate valve 3 times. Record the pressure relief valve
actuation pressure reading.
If the pressure does not meet the relief pressure specification, install a new power
steering pump. For additional information, refer to
9. Set engine speed to 1500 rpm. Record the flow rate.
If the flow rate varies more than 3.785 liters/minute (1 gallon/minute) from the initial flow
rate reading, install a new power steering pump. For additional information, refer to
Section 211-02
10. CAUTION: Do not hold the steering wheel against the stops for more than three to
five seconds at a time. Damage to the power steering pump will occur.
Set the engine speed at idle. Turn (or have an assistant turn) the steering wheel to the left and
right stops. Record flow rate and pressure readings at the stops.
The pressure reading at both stops should be nearly the same as the maximum pump
relief pressure.
The flow rate should drop below 1.9 liters/minute (0.5 gallons/minute).
If the pressure does not reach the maximum pump relief pressure or the flow rate does
not drop below the specified value, excessive internal leakage is occurring. Install a new
steering gear as necessary. For additional information, refer to
Section 211-02
.
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Section 211-02 .
Section 211-02 .