Abstract: A method of determining a current operating range of a transfer case includes continuously calculating current Combined Drive Ratio (CDR), and categorizing the current CDR into one of a pre-determined number of expected CDRs. Counters are used to track when the current CDR is identified as an expected CDR. The different counters are then analyzed using simple mathematical operations to identify which gear ratio the transfer case is currently operating in.

Abstract: A method of determining a current operating range of a transfer case includes continuously calculating current Combined Drive Ratio (CDR), and categorizing the current CDR into one of a pre-determined number of expected CDRs. Counters are used to track when the current CDR is identified as an expected CDR. The different counters are then analyzed using simple mathematical operations to identify which gear ratio the transfer case is currently operating in.

Abstract: An event data recorder (EDR) system includes an event identification module, a parameter selection module, and an event recorder module. The event identification module identifies occurrences of a first event and second event of M predetermined events based on operating conditions of an automotive vehicle. The parameter selection module selects a first set of parameters to record from N predetermined parameters when the first event occurs. The parameter selection module selects a second set of parameters to record from the N predetermined parameters when the second event occurs. The event recorder module records data corresponding to the first set of parameters when the first event occurs and records data corresponding to the second set of parameters when the second event occurs. M and N are integers greater than 1 and the first set includes at least one parameter that is different from the parameters included in the second set.

Abstract: A method for diagnosing a device of a vehicle, includes: generating samples of a parameter of the device; indicating whether each of the samples passed or failed based on comparisons of the samples with one of a predetermined value and a predetermined range; tracking a first number of consecutive samples compared, a second number of the first number of samples that failed, a third number of the first number of samples that failed consecutively, and a fourth number of a last predetermined number of samples compared that failed; selecting one of a normal control mode, a temporary default action mode and a permanent default action mode based on the first, second, third, and fourth numbers; and selectively setting a diagnostic trouble code (DTC) in memory when in the permanent default action mode.

Abstract: A method for diagnosing a device of a vehicle, includes: generating samples of a parameter of the device; indicating whether each of the samples passed or failed based on comparisons of the samples with one of a predetermined value and a predetermined range; tracking a first number of consecutive samples compared, a second number of the first number of samples that failed, a third number of the first number of samples that failed consecutively, and a fourth number of a last predetermined number of samples compared that failed; selecting one of a normal control mode, a temporary default action mode and a permanent default action mode based on the first, second, third, and fourth numbers; and selectively setting a diagnostic trouble code (DTC) in memory when in the permanent default action mode.

Abstract: A diagnostic system diagnoses a device and includes fault declaring module that selects one of a normal control mode, a temporary default action and a permanent default action. A counter module tracks a first number of successive test samples, a second number of failed samples that occur during the successive test samples, a third number of successive failed samples, a fourth number of failed samples, and a fifth number of samples since a last failed sample. The fault declaring module transitions to a temporary default action when at least one of the third number of successive failed samples is greater than a first value and the fourth number of failed samples is greater than a second value. The fault declaring module transitions to a permanent default action that is different than the temporary default action when the second number of failed samples is greater than a third value.

Abstract: An event data recorder (EDR) system includes an event identification module, a parameter selection module, and an event recorder module. The event identification module identifies occurrences of a first event and second event of M predetermined events based on operating conditions of an automotive vehicle. The parameter selection module selects a first set of parameters to record from N predetermined parameters when the first event occurs. The parameter selection module selects a second set of parameters to record from the N predetermined parameters when the second event occurs. The event recorder module records data corresponding to the first set of parameters when the first event occurs and records data corresponding to the second set of parameters when the second event occurs. M and N are integers greater than 1 and the first set includes at least one parameter that is different from the parameters included in the second set.

Abstract: A diagnostic system diagnoses a device and includes fault declaring module that selects one of a normal control mode, a temporary default action and a permanent default action. A counter module tracks a first number of successive test samples, a second number of failed samples that occur during the successive test samples, a third number of successive failed samples, a fourth number of failed samples, and a fifth number of samples since a last failed sample. The fault declaring module transitions to a temporary default action when at least one of the third number of successive failed samples is greater than a first value and the fourth number of failed samples is greater than a second value. The fault declaring module transitions to a permanent default action that is different than the temporary default action when the second number of failed samples is greater than a third value.

Abstract: A system and method are provided for analyzing a motor vehicle operating problem. A number of tests are provided for the selected system or component to determine the cause of the problem. One of the tests are selected, and instructions are displayed for the selected test. A result is input for the selected test and it is determined whether the result indicates the problem was experienced during the test. If the problem was not experienced and that the test did not experience a failure, the state of the faults that are detectable by the test are set to substantially “Possible Intermittent Fault”.