The self-test system should be fitted to every application, it can be used to find faults in the engine management system. This could be because it was repaired, or it is an intermittent fault. An inactive fault is one that was an active fault at some time, but is not present now. When an active fault has been repaired, it becomes an inactive fault after 15 seconds. An active fault is one that was found by the engine control module and has not been repaired. Active faults and inactive faults are shown on the diagnostic tool as “ ACTIVE CODES” and “INACTIVE CODES”. Two types of faults are found by the engine control module (ECM) and retained in its memory, they are active faults and inactive faults. It will also check all outputs for open circuit. PERKINS 1300 SERIES (Diagnostic w/o DIAG TOOL) Some Perkins engine are fitted with a self-test system, which can be used to check for active and inactive faults.
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