Index Chrysler Chrysler Town & Country/Voyager, Dodge Caravan, Plymouth Voyager - service repair manual 1992 year
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• Transmission Park/Neutral Switch (automatic Engine Controller Outputs: • Air Conditioning Clutch Relay • Alternator Field • Automatic Idle Speed (AIS) Motor • Auto Shutdown (ASD) and Fuel Pump Relays • Canister Purge Solenoid • Check Engine Lamp • Diagnostic Connector • Emission Maintenance Reminder (EMR) Lamp • Fuel Injectors • Ignition Coil • Radiator Fan Relay • Speed Control Solenoids • Tachometer Output Based on inputs it receives, the engine controller adjusts fuel injector pulse width, idle speed, ignition The engine controller adjusts injector pulse width (air-fuel ratio) based on the following inputs. • coolant temperature • exhaust gas content (oxygen sensor) • engine speed (crankshaft sensor) • manifold absolute pressure • throttle position The engine controller adjusts ignition timing based on the following inputs. • engine speed (crankshaft sensor) • manifold absolute pressure • throttle position • transmission gear selection (park/neutral switch) The engine controller also adjusts engine idle speed through the automatic idle speed (AIS) motor based on • brake switch • coolant temperature • engine speed (crankshaft sensor) • manifold absolute pressure • throttle position • transmission gear selection (park/neutral switch) • vehicle distance (speed) The auto shutdown (ASD) and fuel pump relays are mounted externally, but turned on and off by the The ignition pick-up signals, (camshaft and crank- shaft) are sent to the engine controller. If the engine The engine controller contains a voltage converter that changes battery voltage to a regulated 9.0 volts to Beginning in this model year, the 3.3L engine uses sequential fuel injection. The engine con- AIR CONDITIONING SWITCH SENSE—ENGINE When the air conditioning or defrost switch is put in the ON position and the low pressure and high pres- BATTERY VOLTAGE—ENGINE CONTROLLER INPUT The engine controller monitors the battery voltage input to determine fuel injector pulse width and alter- If battery voltage is low the engine controller will increase injector pulse width (period of time that the BRAKE SWITCH—ENGINE CONTROLLER INPUT When the brake switch is activated, the engine controller receives an input indicating that the brakes being applied. After receiving this input Fig. 2 Engine Controller . FUEL SYSTEM 14 - 83 |