Index Chrysler Chrysler TOWN & COUNTRY, VOYAGER, Dodge Caravan - service repair manual 2001-2007 year
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The following is a list of the monitored compo- nents: • Comprehensive Components • Oxygen Sensor Monitor • Oxygen Sensor Heater Monitor • Catalyst Monitor COMPREHENSIVE COMPONENTS Along with the major monitors, OBD II requires that the diagnostic system monitor any component However, OBD II also requires that inputs from powertrain components to the PCM be tested for (1) Circuit Continuity • Shorted high • Shorted to ground • Outputs tested for functionality NOTE: Comprehensive component monitors are Input Rationality—While input signals to the PCM are constantly being monitored for electrical PCM sensor inputs that are checked for rationality include: • Manifold Absolute Pressure (MAP) Sensor • Oxygen Sensor (O2S) • Engine Coolant Temperature (ECT) Sensor • Camshaft Position (CMP) Sensor • Vehicle Speed Sensor • Crankshaft Position (CKP) Sensor • Intake/inlet Air Temperature (IAT) Sensor • Throttle Position (TPS) Sensor • Ambient Temperature Sensors • Power Steering Switch • Oxygen Sensor Heater • Brake Switch • Leak Detection Pump Switch or NVLD switch (if equipped) • P/N Switch Output Functionality—PCM outputs are tested for functionality in addition to testing for opens and PCM outputs monitored for functionality include: • Ignition Coils • Idle Air Control • Purge Solenoid • EGR Solenoid (if equipped) • LDP Solenoid or NVLD solenoid (if equipped) • Radiator Fan Control • Trans Controls OXYGEN SENSOR (O2S) MONITOR DESCRIPTION—Effective control of exhaust emissions is achieved by an oxygen feedback system. The information obtained by the sensor is used to calculate the fuel injector pulse width. The PCM is 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 (Big Slope) • Reduced output voltage (Half Cycle) • Heater Performance is the time required for the sensor to switch from 25 - 2 EMISSIONS CONTROL RS EMISSIONS CONTROL (Continued) |