Pump Flow & Pressure Test

WARNING: This page is about a different car, the 2004 Mazda B4000, 2004 Mazda B3000, and 2004 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Do not touch the flow meter during the test procedure, or severe burns and serious injury may occur.

CAUTION:

Make sure that the connection point will not interfere with any of the engine accessory drive components or drive belts.

Install the Power Steering Analyzer 211-F001 (014-00207) or equivalent at the high pressure port of the power steering pump. Make sure the power steering analyzer gate valve is fully open.
NOTE:
- On some vehicles, the power steering pump high pressure port is inaccessible and a power steering analyzer 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.
Place a dial thermometer in the power steering pump reservoir.
Check the power steering fluid level. If necessary, add power steering fluid using ATF M-III or equivalent. (e.g., MERCON(R))
Install a tachometer.
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.
Set the engine speed to 1500 RPM. Record the flow rate and the pressure readings. See STEERING SPECIFICATIONS .
1. If the flow rate is below the flow rate specification, the power steering pump may require repair. Continue with the test procedure.
2. If the pressure reading is above the maximum pressure specification, then check power steering hoses for kinks and restrictions.
Partially close the gate valve to obtain 750 psi. Set the engine speed at idle. Record the flow rate. See STEERING SPECIFICATIONS .
- If the flow is less than the specified flow rate, replace the power steering pump; see POWER STEERING PUMP REMOVAL/INSTALLATION .
  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.
See STEERING SPECIFICATIONS .
- If the pressure does not meet the relief pressure specification, replace the power steering pump; see POWER STEERING PUMP REMOVAL/INSTALLATION .
Set the 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, replace the power steering pump; see POWER STEERING PUMP REMOVAL/INSTALLATION .
  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. See STEERING SPECIFICATIONS .
1. The pressure reading at both stops should be nearly the same as the maximum specified pump relief pressure.
2. The flow rate should drop below 1.9 liters/minute (0.5 gallons/minute).
3. 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. Repair or replace the steering gear as necessary; see STEERING GEAR REMOVAL/INSTALLATION .
Turn (or have an assistant turn) the steering wheel slightly in both directions and release quickly while watching the pressure gauge. See STEERING SPECIFICATIONS .
1. The pressure reading should move from the normal back pressure reading and snap back as the steering wheel is released.
2. If the pressure returns slowly or sticks, the rotary valve in the steering gear is sticking or the steering column is binding. Check the steering column and linkages before servicing the steering gear.