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3.3L AND 3.8L MULTI-PORT FUEL INJECTION—SYSTEM OPERATION INDEX page page Air Conditioning (A/C) Clutch Relay—PCM Output . 150 Air Conditioning Switch Sense—PCM Input . . . . 147 Auto Shutdown (ASD) Relay and Fuel Pump Relay—PCM Output . . . . . . . . . . . . . . . . . . . . 151 Battery Voltage—PCM Input . . . . . . . . . . . . . . . 147 Brake Switch—PCM Input . . . . . . . . . . . . . . . . . 147 Camshaft Position Sensor—PCM Input . . . . . . . 147 Canister Purge Solenoid—PCM Output . . . . . . . 151 CCD Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Crankshaft Position Sensor—PCM Input . . . . . . 148 Data Link Connector—PCM Output . . . . . . . . . . 152 Electric EGR Transducer (EET) Solenoid—PCM Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 Engine Coolant Temperature Sensor—PCM Input . 148 Fuel Injectors and Fuel Rail Assembly . . . . . . . . 155 Fuel Injectors—PCM Output . . . . . . . . . . . . . . . 152 Fuel Pressure Regulator . . . . . . . . . . . . . . . . . . 156 Fuel Supply Circuit . . . . . . . . . . . . . . . . . . . . . . 155 General Information . . . . . . . . . . . . . . . . . . . . . . 145 Generator Field—PCM Output . . . . . . . . . . . . . . 150 Heated Oxygen Sensor (O Sensor)—PCM Input . 149 Idle Air Control Motor—PCM Output . . . . . . . . . 151 Ignition Coil—PCM Output . . . . . . . . . . . . . . . . . 153 Malfunction Indicator Lamp (Check Engine Lamp)—PCM Output . . . . . . . . . . . . . . . . . . . 151 Manifold Absolute Pressure (MAP) Sensor—PCM Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . 153 Powertrain Control Module . . . . . . . . . . . . . . . . . 146 Radiator Fan Relay—PCM Output . . . . . . . . . . . 153 Speed Control Solenoids—PCM Output . . . . . . . 153 Speed Control—PCM Input . . . . . . . . . . . . . . . . 150 System Diagnosis . . . . . . . . . . . . . . . . . . . . . . . 146 Tachometer—PCM Output . . . . . . . . . . . . . . . . . 153 Throttle Body . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 Throttle Position Sensor (TPS)—PCM Input . . . . 150 Transaxle Control Module—PCM Output . . . . . . 152 Transaxle Park/Neutral Switch—PCM Input . . . . 150 Vehicle Speed and Distance Input—PCM Input . 150 GENERAL INFORMATION 3.3L and 3.8L engines use a sequential Multi-port Electronic Fuel Injection system (Fig. 1). The MPI system is computer regulated and provides precise The MPI system is operated by the powertrain con- trol module (PCM). Fig. 1 Multi-Port Fuel Injection Components Ä FUEL SYSTEMS 14 - 145 |