Index Chrysler Chrysler Town & Country/Voyager, Dodge Caravan, Plymouth Voyager - service repair manual 1992 year
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• Engine start-up • Engine warm-up • Cruise (Idle) • Acceleration • Deceleration • Wide Open Throttle • Ignition switch OFF The engine start-up (crank), engine warm-up, and wide open throttle modes are OPEN LOOP modes. IGNITION SWITCH ON (ZERO RPM) MODE When the multi-point fuel injection system is acti- vated by the ignition switch, the following actions When the key is in the ON position and the engine is not running (zero rpm), the auto shutdown (ASD) relay ENGINE START-UP MODE This is an OPEN LOOP mode. The following actions occur when the starter motor is engaged. If the engine controller receives the camshaft and crankshaft signals, it energizes the auto shutdown The engine controller energizes all six injectors until it determines crankshaft position from the camshaft After determining crankshaft position, the controller begins energizing the injectors in sequence. The con- When the engine idles within 664 RPM of its target RPM, the controller compares current MAP sensor Once the ASD and fuel pump relays have been energized, the engine controller: ENGINE WARM-UP MODE This is a OPEN LOOP mode. The following inputs are received by the engine controller: • manifold absolute pressure (MAP) • engine speed (crankshaft position sensor) • throttle position • A/C switch • battery voltage The controller adjusts injector pulse width and con- trols injector synchronization by turning the individual The engine controller adjusts ignition timing and engine idle speed. Engine idle speed is adjusted CRUISE OR IDLE MODE When the engine is at operating temperature this is a CLOSED LOOP mode. During cruising speed the • manifold absolute pressure • engine speed (crankshaft position sensor) • throttle position • exhaust gas oxygen content • A/C control positions • battery voltage The controller adjusts injector pulse width and con- trols injector synchronization by turning the individual The engine controller adjusts engine idle speed and ignition timing. The engine controller adjusts the ACCELERATION MODE This is a CLOSED LOOP mode. The engine control- ler recognizes an abrupt increase in throttle position or . FUEL SYSTEM 14 - 91 |