Tires - Pressure Requirements/Recommendations
NO: 77-18
DATE: 5-15-2007
MODEL:
All
MODEL YEAR:
All
SUBJECT:
Tire Pressures, Requirements and Recommendations
REFERENCE:
VIDA, SMB 17-006, owners' manuals
Description
Tire pressure is a critical element of vehicle performance. Correct tire pressure is important for:
^ achieving good fuel economy
^ achieving optimum comfort and good driving characteristics
^ helping to prevent flat-spotted tires due to low tire pressures
As stated in the Model Year 2007 owners' manuals:
^ Under-inflation is the most common cause of tire failure and may result in severe tire cracking, tread separation, or 'blow-out,' with unexpected
loss of vehicle control and increased risk of injury.
^ Under-inflated tires reduce the load carrying capacity of your vehicle.
Over-inflation is also undesirable. Over-inflated tires can be stiff and unyielding, and will cause the vehicle to ride more harshly and loudly.
Under-inflation or over-inflation may cause uneven treadwear patterns.
There are many opportunities for the Volvo retailer to check and maintain proper tire pressure, from new vehicle storage, to delivery, through the
service life of the vehicle. This TNN is designed to summarize and highlight Volvo's requirements and recommendations regarding tire pressures.
Service
GENERAL:
Tire pressures should always be checked cold. Tires are considered to be cold when they have the same temperature as the surrounding (ambient)
1982 Volvo 240 L4-2127cc 2.1L SOHC B21F Copyright ? 2013, ALLDATA 10.52SS Page 80
air. This temperature is normally reached after the vehicle has been parked for at least 3 hours.
After driving a distance of approximately 1 mile (1.6 km), tires are considered to be hot.
When the weather temperature changes, tire inflation pressures also change. A 10-degree F (5-degree C) temperature drop causes a corresponding
drop of 1 psi (7 kPa) in inflation pressure.
TRANSPORT PRESSURE:
All new Volvo vehicles are delivered from the port to the retail facility with tires at 'transport pressure', which is 43 psi (300 kPa). As indicated in
Service Manager Bulletin 17-006, Retail Car Delivery Process, Stock Maintenance checks require that tire pressure be checked every 60 days, and
be maintained at 43 psi (300 kPa). This is also true for vehicles on static display, such as the showroom or outside display areas. This transport
pressure must be maintained until just before retail delivery.
Note!
Failure to maintain transport pressure in tires may result in tire damage not covered by the tire manufacturer's warranty.
CPS (CUSTOMER PREPARATION SERVICE):
SMB 17-006 also gives detailed information regarding operations to conduct during the CPS (Customer Preparation Service).
Note!
CPS should only be completed just prior to actual retail delivery of the vehicle to the customer.
Model Year 2007 U.S. specification vehicles have only one recommended tire pressure. This is the case whether the vehicle is equipped with a Tire
Pressure Monitoring System (TPMS) or not. It is critical during CPS (and whenever tire pressures are checked and set) that all 4 tires be set exactly
to the tire pressure indicated on the tire pressure label. This will assure that the customer has the best combination of ride, handling, and tire life.
Canadian specification vehicles continue to use labels with both a cold tire pressure and an optional tire pressure.
In all cases:
Use the recommended cold inflation pressure for optimum tire performance and wear.
NITROGEN:
There have been reports in the industry regarding the use of nitrogen for inflating tires. Volvo's position is that nitrogen is not required when
servicing tires. While it is not harmful to use, it is also not necessary. This is true even for vehicles with TPMS.
CALIBRATION OF TIRE PRESSURE MEASURING EQUIPMENT:
VIDA can be used to check a vehicle's tire pressures.
This is the path in VIDA to follow:
Diagnostics > Vehicle communication > UEM> Advanced > Quick Test
As the tire pressure displayed in VIDA is extremely accurate, this display can be used to 'calibrate' tire pressure measuring equipment in the service
workshop. Compare the VIDA reading with a tire pressure gauge, and compensate accordingly.
TPMS (TIRE PRESSURE MONITORING SYSTEM):
TPMS (Tire Pressure Monitoring System) was optional on certain Model Year 2005 and 2006 vehicles fitted with SST (self-supporting tires).
TPMS is standard equipment on all U.S. specification Model Year 2007 S60 (except S60R), V70 (except V70R), XC70, XC90, and S80 vehicles. It
is planned to be standard equipment on 100% of the U.S. specification Model Year 2008 vehicles. TPMS is optional on Model Year 2007 Canadian
specification vehicles.
The system must be regarded as a driver aid to maintain the correct tire pressure. TPMS does not take the place of good vehicle maintenance which
requires that tire pressure be checked on a regular basis. The owners' manual recommends to the owner that tire pressures be checked monthly.
When inflating the tire with air, you must, as much as possible, ensure that the tires are at same temperature as the outside temperature. When
inflating with air, the tires must be filled to the pressure stated on the decal located on the car body. These pressures MUST be followed.
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