How does the PCM determine catalyst efficiency?
What will be an ideal response?
The PCM determines catalyst efficiency by comparing the switching ratio of the pre-catalyst to the post-catalyst oxygen sensors. The upstream oxygen sensor waveform pattern should be switching rapidly. The downstream oxygen sensor waveform pattern will be relatively flat.
You might also like to view...
A single-conversion UPS system _____.
a. has poor noise isolation from line to load b. has excellent frequency stability c. may achieve zero transfer time d. supplies AC power directly to critical loads through a series inductor or transformer
Cite four statistics that demonstrate the importance of transportation in the United States.
What will be an ideal response?
Used coolant should be ________
A) Reused B) Recycled C) Disposed of properly D) Either B or C
After being energized, what type of function could a typical relay with normally closed contacts directly
perform? a. De-energize a crankcase heater b. Energize an inducer motor c. Start a compressor d. Complete a circuit to a motor start winding