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更新日期：2019-01-11
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Are tailpipe emissions tests going away? That seems to be the case for 1996 and newer vehicles. Many states have changed or are in the process of changing their vehicle inspection programs to Onboard Diagnostic II (OBD II) computer plug-in checks for late-model cars and trucks. In some states, such as Illinois, the dyno tailpipe tests have been eliminated altogether and replaced with OBD II plug-in tests (1995 and older cars no longer have to be tested).
OBD II is primarily emissions-driven and will set codes anytime a vehicle has a fault that may cause emissions to exceed federal limits by 1.5 times. It does not necessarily mean the vehicle has a real emissions problem. Many times it does not. But if the nature of the failure is such that it might cause emissions to rise, OBD II will set a code anyway. That is why some states allow motorists to opt for a second-chance tailpipe test if their vehicle fails an OBD II test. In many instances, the vehicle will pass the tailpipe test.
OBD II monitors misfires, converter efficiency, catalyst heater (if used), the evaporative system, air injection system (if used), fuel trim, oxygen sensors, exhaust gas recirculation (if used), secondary air system (if used), the coolant thermostat (starting in 2000), positive crankcase ventilation system (starting in 2002) and even the A/C systems on some 2002 and newer vehicles.
learn:
BCM (BODY CONTROL MODULE)
- POWER SUPPLY, GROUND, IGNITION SWITCH CIRCUIT
- POWER MODE, RAIN SENSOR & REAR WIPER SWITCH CIRCUIT
- HEAD LAMP, ILLUMINATION, FRONT/REAR FOG, BRAKE SWITCH & DIMMER CONTROL CIRCUIT
- INTERIOR LAMP, BACK UP LAMP, GEAR SHIFT LEVEL, SWITCH (WINTER MODE, CRUISE, HAZARD,
TURN SIGNAL) CIRCUIT
- FRONT WIPER, LIFT GATE WIPER, RAIN SENSOR & EVAP CORE TEMP. SENSOR CIRCUIT
- DOOR LOCK/UNLOCK, HORN, DOOR LATCH, PARKING ASSIST & SWITCH (PARK BRAKE, HOOD OPEN, DOOR LOCK) CIRCUIT
- POWER WINDOW, LIFT GATE GLASS, COUPLING CONTROL MODULE, ESP SWITCH & MANUAL A/C CONTROLLER CIRCUIT
- FRONT WIPER CIRCUIT
- LIFT GATE WIPER CIRCUIT & HEAD LAMP WASHER CIRCUIT
ECM (ENGINE CONTROL MODULE) : (2.0 DIESEL)
- BATTERY POWER SUPPLY, GROUND, GLOW PLUG CONTROL UNIT, FUEL HEATER, GENERATOR &
CKP SENSOR CIRCUIT
- INJECTOR, FUEL PUMP & SENSOR (EXHAUST GAS TEMPERATURE, FUEL TEMPERATURE)
CIRCUIT
- SENSOR (WIF, MAF/IAT, DPF PRESSURE, RAIL PRESSURE, ECT,ACP), SWITCH (OIL PRESSURE),
RAIL PRESSURE CONTROL VALVE & FUEL METERING UNIT CIRCUIT
- SENSOR (ACCELERATOR PEDAL, BOOST PRESSURE, FUEL LEVEL,CMP), ACTUATOR
(THROTTLE PLATE, BOOST PRESSURE), CLUTCH SWITCH & EGR VALVE CIRCUIT
- BRAKE SWITCH, BACK UP SWITCH & NSBU SWITCH CIRCUIT
- DLC (DATA LINK CONNECTOR) CIRCUIT
INTERIOR LAMP CIRCUIT
- LAMPS (MAP, ROOM, DOOR STEP, SUNVISOR, LUGGAGE, GLOVE BOX, KEY HOLE) CIRCUIT
STOP LAMP, CENTER HIGH MOUNT STOP LAMP (CHMSL), BACK UP LAMP & ECM MIRROR
CIRCUIT
HAZARD & TURN SIGNAL LAMP CIRCUIT
FRONT & REAR FOG LAMP CIRCUIT
ILLUMINATION CIRCUIT
- ILLUMINATION, DIMMER CONTROL SWITCH & HEATING MAT SWITCH CIRCUIT
- LAMP (LICENSE PLATE & FRONT/REAR PARKING) CIRCUIT
FATC (FULL AUTOMATIC TEMPERATURE CONTROL)
- MOTOR (BLOWER, INTAKE, MODE, TEMPERATURE) & POWER MODULE CIRCUIT
- SENSOR (AQS, DUCT TEMP., EVAP CORE TEMP., INCAR, COMBI), ECM & BCM CIRCUIT
STARTING & CHARGING SYSTEM
- BATTERY, STARTER MOTOR, GENERATOR & NSBU SWITCH CIRCUIT : (DIESEL / GASOLINE)
- IGNITION SWITCH CIRCUIT
- POWER MODE CIRCUIT
ECM (ENGINE CONTROL MODULE)
- BATTERY POWER SUPPLY, GROUND, EI SYSTEM, GENERATOR & CKP SENSOR CIRCUIT
- FUEL PUMP, INJECTOR & HEATED O2 SENSOR CIRCUIT
- ETC MODULE, SENSOR (MAP, ECT, KNOCK, ACP & ACCELERATOR PEDAL), OIL PRESSURE SWITCH & LEGR CIRCUIT
- EVAP CANISTER PURGE SOLENOID, SENSOR (CMP,ACCELERATOR PEDAL,FUEL LEVEL) & CLUTCH SWITCH CIRCUIT
- BRAKE SWITCH, BACK UP SWITCH, NSBU SWITCH CIRCUIT
- DLC (DATA LINK CONNECTOR) CIRCUIT