2014 Monitors And Drive Cycles

4 09 2014

Dale BertramScenario 1: Recent repairs to your vehicle’s “Check Engine Light” have included a reset of the On Board Diagnostic (OBD) system. This process has also reset the OBD readiness monitoring system. The readiness monitors now need to re-test the computer system before verifying that all systems are functioning as designed and working properly.

WHAT DO I DO NOW?
Drive the car normally. All OBD systems self-test the computer while you’re driving and you will never know it. Depending on the manufacturer of the vehicle, there are 5 to 10 readiness monitors that need to be tested.

To allow your vehicle’s readiness monitors to perform their tests and reset the OBD system to a “ready” state, and to determine that all systems are working properly, your vehicle will have to be driven though a drive cycle. (Who knew my car had to pass a test to work properly?)

Your vehicle’s specific drive cycle can depend on the vehicle make and model. A normal drive cycle is 5 miles of city, stop and go driving and 5 miles of steady 60 MPH of freeway driving in the same key cycle.

Keep in mind that repairing a check engine light for one system or code may unlock another hidden pending code of another system while the drive cycle tests are being performed.

So, if the Check Engine Light illuminates on the dash again, don’t be alarmed. It means the system failed the test. This may happen because when the original check engine light was on, all OBD monitoring stops. Just stop in and we will re-check the system. NOTE: A flashing check engine light should be corrected immediately.
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Scenario 2: Recent repairs to your vehicle’s “Check Engine Light” have included a reset of the On Board Diagnostic (OBD) system. The on-board computer of your vehicle must now perform various self-tests referred to as “monitors” that may take up to a week of driving to complete. (1996 to 2002 cars require more time to complete the checking of monitors by the cars computer system).

WHAT DO I DO NOW?
Drive the car normally. All OBD systems self-test the computer while you’re driving and you will never know it. Depending on the age and make of your vehicle it needs to be driven in various situations such as freeway travel, 10-30 minutes of continuous driving, sitting over night and having various levels of gasoline in the tank.

The original concern that caused the check engine light to come on may have suspended or locked out some of the vehicles other self-tests that it needs to perform. Now that all of the tests are enabled and can complete the cycle, there may be a possibility of hidden issues that may cause the check engine light to come back on. Therefore, a code that did not show up previously may now set indicating a new, hidden, intermittent or remaining problem.

At Fairway Auto Repair we do as much as we can to ensure that your vehicle is repaired properly, is safe and dependable for our customers. There are some instances that require extensive driving in order to complete tests that we cannot perform here in the shop. Therefore, if the check engine light does come on, please call or return to the shop at your convenience to have the system rechecked at no cost. In most instances we can retrieve the code within a few minutes. Always use your best discretion if the vehicle is not operating properly. Warning: if the “Check Engine Light” is flashing, this requires immediate action.

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Fairway Auto Repair

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