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3.0L MULTI-PORT FUEL INJECTION—ON-BOARD DIAGNOSTICS INDEX page page 60-Way PCM Wiring Connector . . . . . . . . . . . . . 136 Circuit Actuation Test Mode . . . . . . . . . . . . . . . . 134 Diagnostic Trouble Code Description . . . . . . . . . 131 General Information . . . . . . . . . . . . . . . . . . . . . . 130 High and Low Limits . . . . . . . . . . . . . . . . . . . . . 131 Ignition Timing Procedure . . . . . . . . . . . . . . . . . 136 Monitored Circuits . . . . . . . . . . . . . . . . . . . . . . . 130 Non-Monitored Circuits . . . . . . . . . . . . . . . . . . . 131 State Display Test Mode . . . . . . . . . . . . . . . . . . 134 System Tests . . . . . . . . . . . . . . . . . . . . . . . . . . 134 Throttle Body Minimum Air Flow Check Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 GENERAL INFORMATION The PCM has been programmed to monitor many different circuits of the fuel injection system. If a Certain criteria must be met for a diagnostic trou- ble code to be entered into PCM memory. The crite- 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 a problem with the circuit, the PCM senses whether Oxygen Sensor - The PCM can determine if the oxygen sensor is switching between rich and lean Fig. 1 PCM—AA Body Fig. 2 PCM—AC Body 14 - 130 FUEL SYSTEMS Ä |