ZDX V6-3.7L (2010)
7. Turn the steering wheel from lock to lock several times to warm the fluid to operating temperature at 158 °F (70 °C).
8. Measure steady-state fluid pressure while the engine is idling. The gauge should read no more than 1,470 kPa (14.99 kgf/cm2, 213.2 psi).
If the reading is high, check for:
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Clogged or deformed inlet or return line between the pump and the steering gearbox.
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Clogged valve body unit.
9. Let the engine idle, and gradually close the shut-off valve and immediately read the pressure.
NOTICE
Do not keep the shut-off valve closed more than 5 seconds or the pump could be damaged by over-heating.
10. Immediately open the shut-off valve fully. If the pump is in good condition, the gauge should read at least 9,250-9,750 kPa (94.32-99.42 kgf/cm2,
1,341.6-1,414.1 psi). A low reading means pump output is too low for full assist. Repair or replace the pump.
