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3.3L AND 3.8L MULTI-PORT FUEL INJECTION—ON-BOARD DIAGNOSTICS INDEX page page 60-Way Pcm Wiring Connector . . . . . . . . . . . . . 167 Circuit Actuation Test Mode . . . . . . . . . . . . . . . . 166 Diagnostic Trouble Code Description . . . . . . . . . 163 General Information . . . . . . . . . . . . . . . . . . . . . . 162 High and Low Limits . . . . . . . . . . . . . . . . . . . . . 163 Monitored Circuits . . . . . . . . . . . . . . . . . . . . . . . 162 Non-Monitored Circuits . . . . . . . . . . . . . . . . . . . 162 State Display Test Mode . . . . . . . . . . . . . . . . . . 163 System Tests . . . . . . . . . . . . . . . . . . . . . . . . . . 163 Throttle Body Minimum Air Flow Check Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 GENERAL INFORMATION The powertrain control module (PCM) has been programmed to monitor many different circuits of the Certain criteria must be met for a diagnostic trou- ble code to be entered into the PCM memory. The It is possible a diagnostic trouble code for a moni- tored circuit may not be entered into memory even There are several operating conditions that the PCM does not monitor and set diagnostic trouble Stored diagnostic trouble codes can be displayed ei- ther by cycling the ignition key On - Off - On - Off - MONITORED CIRCUITS The powertrain control module (PCM) can detect certain fault conditions in the fuel injection system. Open or Shorted Circuit - The PCM can deter- mine if the sensor output (input to PCM) is within Output Device Current Flow - The PCM senses whether the output devices are hooked up. If there is Oxygen Sensor - The PCM can determine if the oxygen sensor is switching between rich and lean NON-MONITORED CIRCUITS The powertrain control module (PCM) does not monitor the following circuits, systems and condi- Fuel Pressure - Fuel pressure is controlled by the vacuum assisted fuel pressure regulator. The PCM Fig. 1 Powertrain Control Module (PCM) 14 - 162 FUEL SYSTEMS Ä |