What is OBD monitor test?
An OBD monitor is a computer test or series of computer tests used to determine if an emission control device or system is failing. The vehicle performs the self-diagnostic computer test when the vehicle is driven. This is commonly referred to as a “drive cycle.”
How do I test my OBD monitor?
To determine if readiness OBD II monitors are complete:
- Turn the ignition key to the “on” position for 15 seconds without cranking the engine.
- If the “Service Engine Soon” light blinks eight times, one or more readiness monitors are incomplete.
What is obd2 inspection?
OBD II is an acronym for On-Board Diagnostic II, the second generation of on-board self-diagnostic equipment requirements for light- and medium-duty California vehicles. Each component is checked by a diagnostic routine to verify that it is functioning properly.
What is the difference between on-board and off-board diagnosis?
While on-board vehicle diagnostics protocols like OBD/OBD2 are tasked primarily with emission related diagnosis, off-board vehicle diagnostics (UDS, KWP etc.) handle the diagnostics related to every other vehicle ECU (Electronic Control Unit).
How does UDS work?
Unified Diagnostic Services (UDS) is an automotive protocol that lets the diagnostic systems communicate with the ECUs to diagnose faults and reprogram the ECUs accordingly (if required). The diagnostic tester tool has a GUI that connects to the ECU, retrieves the fault code and displays it.
How does the EVAP system in OBD II work?
As with most other monitored OBD II systems, all EVAP electrical components are checked for electrical and rationality faults during continuous monitoring. The EVAP system monitor checks for fuel vapor leaks by performing either a pressure or vacuum test on the fuel system.
How do you pass the OBD-2 emissions test?
To pass an OBD-II emissions test, a vehicle must: If you clear the ‘Check Engine’ light, or reset the OBD-II monitors right before your emissions test, your vehicle typically will not pass because the catalyst and EVAP monitors need time to run.
What is the purpose of the EVAP system monitor?
EVAP System Monitor. The EVAP system monitor allows the PCM to test the integrity of the fuel system and its ability to draw fuel vapor into the engine for combustion. A portion of the monitor is activated during canister purge operation that occurs under normal engine and vehicle operating conditions.
When to turn on leak detection on OBD II?
The leak detection portion of the monitor may be activated under normal engine and vehicle operating conditions, during extended idle or soon after the vehicle has been shut off. As with most other monitored OBD II systems, all EVAP electrical components are checked for electrical and rationality faults during continuous monitoring.
To pass an OBD-II emissions test, a vehicle must: If you clear the ‘Check Engine’ light, or reset the OBD-II monitors right before your emissions test, your vehicle typically will not pass because the catalyst and EVAP monitors need time to run.
What is a readiness monitor in OBDII system?
A readiness monitor is a test that your OBDII system runs to ensure that a particular emission control component is working properly. Your OBDII system runs one test (readiness monitor) for each vehicle emission control component.
What does on board diagnostic II ( OBDII ) mean?
Vehicles equipped with On Board Diagnostic II (OBDII), which includes most 1996 or newer gasoline-powered vehicles and most 1997 or newer diesel-powered vehicles that have a gross vehicle weight rating (GVWR) less than 8,501 pounds, self-test their emission systems utilizing various monitors.
What are the drive cycles for the EVAP monitor?
EVAP Drive Cycles. The following are sample drive cycles for the EVAP monitor: Ford: With fuel tank one half to three-quarters full, cruise at 45 to 65 mph for 10 minutes. Avoid sharp turns and hills during this period.