31603 - Innova Pro

Onboard DiagnosticsOBD2 MONITORSexhaust stream. A faulty oxygen sensor reacts slowly, or its voltagesignal is weak or missing.The Oxygen Sensor Monitor is supported by “spark ignition” vehiclesonly. The Oxygen Sensor Monitor is a “Two-Trip” monitor. If a fault isfound on the first trip, the computer temporarily saves the fault in itsmemory as a Pending Code. The computer does not command the MILon at this time. If the fault is sensed again on the second trip, thecomputer commands the MIL “On,” and saves the code in its long-termmemory.Secondary Air System Monitor - When a cold engine is firststarted, it runs in open-loop mode. During open-loop operation,the engine usually runs rich. A vehicle running rich wastes fuel andcreates increased emissions, such as carbon monoxide and somehydrocarbons. A Secondary Air System injects air into the exhauststream to aid catalytic converter operation:1. It supplies the catalytic converter with the oxygen it needs to oxidizethe carbon monoxide and hydrocarbons left over from thecombustion process during engine warm-up.2. The extra oxygen injected into the exhaust stream also helps thecatalytic converter reach operating temperature more quickly duringwarm-up periods. The catalytic converter must heat to operatingtemperature to work properly.The Secondary Air System Monitor checks for component integrity andsystem operation, and tests for faults in the system. The computer runsthis Monitor once per trip.The Secondary Air System Monitor is a “Two-Trip” monitor. If a fault isfound on the first trip, the computer temporarily saves this fault in itsmemory as a Pending Code. The computer does not command the MILon at this time. If the fault is sensed again on the second trip, thecomputer commands the MIL “On,” and saves the code in its long-termmemory.Non-Methane Hydrocarbon Catalyst (NMHC) Monitor - Thenon-methane hydrocarbon catalyst is a type of catalytic converter.It helps to remove non-methane hydrocarbons (NMH) left over from thecombustion process from the exhaust stream. To accomplish this, heatand catalyst materials react with the exhaust gases to convert NMH toless harmful compounds. The computer checks the efficiency of thecatalyst by monitoring the quantity of NMH in the exhaust stream. Themonitor also verifies that sufficient temperature is present to aid inparticulate matter (PM) filter regeneration.The NMHC Monitor is supported by “compression ignition” vehicles only.The NMHC Monitor is a “Two-Trip” Monitor. If a fault is found on the firsttrip, the computer temporarily saves the fault in its memory as aPending Code. The computer does not command the MIL on at this time.If the fault is sensed again on the second trip, the computer commandsthe MIL “On,” and saves the code in its long-term memory.24 CarScan+ ABS/SRS