Hard Code

A DTC that comes back within one cycle of the ignition key is a hard code. This means that the problem is current every time the ECM/SKREEM checks that circuit or function. Procedures in this article verify if the DTC is a hard code at the beginning of each test. When the fault is not a hard code, an intermittent test must be performed.

NOTE: If the DRBIII® displays faults for multiple components (i.e. ECT, MAF, IAT sensors) identify and check the shared circuits for possible problems before continuing (i.e. sensor grounds or 5-volt supply circuits). Refer to the appropriate schematic to identify shared circuits.