Tire Pressure Monitoring System (Tpms) - Required Federal Explanation; Testing Of Readiness Codes - Acura MDX 2015 Owner's Manual

mAINTeNANCe

Tire Pressure monitoring System (TPmS) - required Federal explanation

Each tire, including the spare (if provided), should be checked monthly when cold
and inflated to the inflation pressure recommended by the vehicle manufacturer
on the vehicle placard or tire inflation pressure label.
(If your vehicle has tires of a different size than the size indicated on the vehicle
placard or tire inflation pressure label, you should determine the proper tire
inflation pressure for those tires.)
As an added safety feature, your vehicle has been equipped with a tire pressure
monitoring system (TPMS) that illuminates a low tire pressure telltale
when one or more of your tires is significantly under-inflated.
Accordingly, when the low tire pressure telltale illuminates, you
should stop and check your tires as soon as possible, and inflate them
to the proper pressure.
Driving on a significantly under-inflated tire causes the tire to overheat and can
lead to tire failure. Under-inflation also reduces fuel efficiency and tire tread life,
and may affect the vehicle's handling and stopping ability.
Please note that the TPMS is not a substitute for proper tire maintenance, and it is
the driver's responsibility to maintain correct tire pressure, even if under-inflation
has not reached the level to trigger illumination of the TPMS low tire pressure
telltale.
Your vehicle has also been equipped with a TPMS malfunction indicator to indicate
when the system is not operating properly. The TPMS malfunction indicator
is combined with the low tire pressure telltale. When the system detects a
malfunction, the telltale will flash for approximately one minute and then remain
continuously illuminated. This sequence will continue upon subsequent vehicle
start-ups as long as the malfunction exists.
When the malfunction indicator is illuminated, the system may not be able to
detect or signal low tire pressure as intended.
TPMS malfunctions may occur for a variety of reasons, including the installation
of replacement or alternate tires or wheels on the vehicle that prevent the TPMS
from functioning properly.
Always check the TPMS malfunction telltale after replacing one or more tires
or wheels on your vehicle to ensure that the replacement or alternate tires and
wheels allow the TPMS to continue to function properly.
136 |

Testing of readiness Codes

Your vehicle has "Readiness Codes" as part of the onboard self-diagnostic system. Some
states refer to these codes as a test to see if your vehicle's emissions components are
working properly. The codes may not be read if you go through the testing just after the
battery has gone dead or been disconnected.
To check if they are set, set the power mode to ON without starting the engine. The
malfunction indicator lamp will come on for several seconds. If it goes off, the readiness
codes are set. If it blinks five times, the readiness codes are not set.
If you are required to have your vehicle tested before the readiness codes are set, prepare
the vehicle for retesting by doing the following:
1. Fill the gas tank to approximately 3/4 full.
2. Park the vehicle and leave the engine off for 6 hours or more.
3. Make sure the ambient temperature is between 40°F and 95°F (4°C and 35°C).
4. Start the engine without touching the accelerator pedal, and let it idle for 20 seconds.
5. Keep the vehicle in Park (P). Increase the engine speed to 2,000 rpm, and hold it there
for about 3 minutes.
6. Let the engine idle with your foot off the accelerator for 20 seconds.
7. Select a nearby, lightly traveled major highway where you can maintain a speed of 50 to
60 mph (80 to 97 km/h) for at least 20 minutes. Drive on the highway with the vehicle
in Drive. Do not use cruise control. When traffic allows, drive for 90 seconds without
using the accelerator pedal. (Vehicle speed may vary slightly; this is OK.) If you cannot
do this for a continuous 90 seconds because of traffic conditions, drive for at least 30
seconds, then repeat two more times (for a total of 90 seconds).
8. Drive in city/suburban traffic for at least 10 minutes. When traffic conditions allow, let
the vehicle coast for several seconds without using the accelerator pedal or the brake
pedal.
9. Park the vehicle and leave the engine off for 30 minutes.
The readiness codes are erased when the battery is disconnected, and set again only after
several days of driving under a variety of conditions.
If a testing facility determines that the readiness codes are not set, you may be requested
to return at a later date to complete the test, or see your dealer.
mAINTeNANCe
| 137