Diagnostics Emission Control Systems for Jeep 2000 XJ, Description and operation : EMISSION SYSTEM MALFUNCTION INDICATOR LAMP (MIL) STATE DISPLAY TEST MODE CIRCUIT ACTUATION TEST MODE DIAGNOSTIC TROUBLE CODES DIAGNOSTIC TROUBLE CODE DESCRIPTIONS. The PCM might not store a DTC for a monitored circuit even though a malfunction has occurred. For example, assume the diagnostic trouble code criteria requires the PCM to monitor the circuit only when the engine operates between 750 and 2000 RPM. Suppose the sensor’s output circuit shorts to ground when engine operates above 2400 RPM (resulting in 0 volt input to the
PCM). CIRCUIT ACTUATION TEST MODE OPERATION The Circuit Actuation Test Mode checks for proper operation of output circuits or devices the Powertrain Control Module (PCM) may not internally recognize. A Diagnostic Trouble Code (DTC) indicates that the
Powertrain Control Module (PCM) has recognized an abnormal condition in the system. DTC’s are the results of a system or circuit
failure, but do not directly identify the failed component or components. Problem detected in oxygen sensor heater relay circuit.
Tags : powertrain control module pcm, powertrain control module, emission control systems, output circuits, circuit failure, code criteria, oxygen sensor, emission system, trouble code, code descriptions, relay circuit, board diagnostics, abnormal condition, indicator lamp, mode operation
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