DETROIT -- Although the basis for determining vehicle onboard diagnostic (OBD) compliance systems is difficult to define, General Motors Corp. accepts the reality that OBD must function effectively under a broad array of environmental, driver-style, fuel and vehicle conditions. This is one of the reasons why achieving OBD fault signal precision is extremely difficult, says a GM Powertrain group spokesman, who provides Ward’s with considerable detail on the complexity of the issue and the ...

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