QX56 V8-5.6L (VK56DE) (2004)
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Cold ambient temperature conditions may cause the tire pressure to drop and the LTPWS to illuminate the Low Tire Pressure Warning Light.
Example (vehicle with a tire pressure specification of 32 p.s.i.):
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If the temperature is 70°F and the tire pressure is 30 psi., the LTPWS warning light will stay OFF.
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However, if the temperature drops to 30° F, the tire pressure will drop to 27 p.s.i. and the LTPWS light will come ON.
If you think the LPTWS light is coming on because of temperature-related pressure changes:
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First, check the tire pressure using the LTPWS display before replacing any parts.
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Set the tire pressure to the correct specification. It's shown on the vehicle's Tire and Loading Information Label.
NOTE:
LTPWS does not adjust air pressure for a temperature change.
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Please inform the customer that tire pressure can change due to temperature.
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Cold ambient temperature conditions may effect the tire pressure more at high altitudes. See High Altitude.
High Altitude:
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The LTPWS measures the pressure inside the tire.
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The LTPWS does not adjust air pressure for extreme altitude conditions.
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In extreme altitude conditions a standard tire pressure gauge may show a different pressure than the LTPWS display.
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The tire pressure should be set using the LTPWS display.
Example:
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When the vehicle is at 0 ft altitude, the LTPWS display and the standard tire gauge will show the same p.s.i. reading: In this case 30 p.s.i.
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When the vehicle is at 5,427 ft altitude (same temperature) the LTPWS display will still show 30 p.s.i. and the standard tire gauge will show 33 p.s.i.