Index Chrysler Chrysler TOWN & COUNTRY, VOYAGER, Dodge Caravan - service repair manual 2001-2007 year
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FUEL INJECTOR MECHANICAL MALFUNCTIONS The PCM cannot determine if a fuel injector is clogged, the needle is sticking or if the wrong injector EXCESSIVE OIL CONSUMPTION Although the PCM monitors engine exhaust oxygen content when the system is in closed loop, it cannot THROTTLE BODY AIR FLOW The PCM cannot detect a clogged or restricted air cleaner inlet or filter element. VACUUM ASSIST The PCM cannot detect leaks or restrictions in the vacuum circuits of vacuum assisted engine control PCM SYSTEM GROUND The PCM cannot determine a poor system ground. However, one or more diagnostic trouble codes may PCM CONNECTOR ENGAGEMENT The PCM may not be able to determine spread or damaged connector pins. However, it might store DESCRIPTION - MONITORED SYSTEMS There are new electronic circuit monitors that check fuel, emission, engine and ignition perfor- The fuel, engine, ignition and emission systems monitors do not indicate a specific component prob- If any of these monitors detect a problem affecting vehicle emissions, the Malfunction Indicator (Check t scan tool. The following is a list of the system monitors: • Misfire Monitor • Fuel System Monitor • Oxygen Sensor Monitor • Oxygen Sensor Heater Monitor • Catalyst Monitor • Evaporative System Leak Detection Monitor (if equipped) Following is a description of each system monitor, and its DTC. Refer to the appropriate Powertrain Diagnos- tics Procedures manual for diagnostic proce- OXYGEN SENSOR (O2S) MONITOR Effective control of exhaust emissions is achieved by an oxygen feedback system. The most important The O2S is also the main sensing element for the EGR (if equipped), Catalyst and Fuel Monitors. The O2S may fail in any or all of the following manners: • Slow response rate • Reduced output voltage • Dynamic shift • Shorted or open circuits switch from lean to rich once it is exposed to a richer The output voltage of the O2S ranges from 0 to 1 volt (voltages are offset by 2.5 volts on NGC vehi- OXYGEN SENSOR HEATER MONITOR If there is an oxygen sensor (O2S) DTC as well as a O2S heater DTC, the O2S heater fault MUST be 25 - 6 EMISSIONS CONTROL RS EMISSIONS CONTROL (Continued) |