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2.5L FLEXIBLE FUEL MULTI-PORT FUEL INJECTION—ON-BOARD DIAGNOSTICS INDEX page page Circuit Actuation Test Mode . . . . . . . . . . . . . . . . . 72 Diagnostic Trouble Codes . . . . . . . . . . . . . . . . . . . 71 . . . . . . . . . . . . . . . . . . . . . . . 70 High and Low Limits . . . . . . . . . . . . . . . . . . . . . . . 71 . . . . . . . . . . . . . . . . . . . 73 Monitored Circuits . . . . . . . . . . . . . . . . . . . . . . . . 70 Non-Monitored Circuits . . . . . . . . . . . . . . . . . . . . . 70 Powertrain Control Module 60-Way Connector . . . 73 State Display Test Mode . . . . . . . . . . . . . . . . . . . . 72 Throttle Body Minimum Air Flow Check Procedure . . 73 GENERAL INFORMATION The powertrain control module (PCM) monitors many different circuits in the fuel injection system. If Certain criteria must be met before the PCM stores a diagnostic trouble code in memory. The criteria may be The PCM might not store a diagnostic trouble code for a monitored circuit even though a malfunction has There are several operating conditions for which the PCM monitors and sets diagnostic trouble codes. Refer Technicians can display stored diagnostic trouble codes by two different methods. The first is to cycle the The second method of reading diagnostic trouble codes uses the DRBII scan tool. The DRBII scan tool vehicle (Fig. 1). For diagnostic trouble code informa- MONITORED CIRCUITS The PCM can detect certain fault conditions in the fuel injection system. Open or Shorted Circuit - The PCM can determine if the sensor output (input to the PCM) is within proper Output Device Current Flow - The PCM senses whether output devices are hooked up. If a problem Heated Oxygen Sensor - Once the system has entered closed loop, the PCM determines if the oxygen NON-MONITORED CIRCUITS The PCM does not monitor the following circuits, systems and conditions that could have malfunctions Fig. 1 Data Link (Diagnostic) Connector 14 - 70 FUEL SYSTEMS Ä |