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.

Trades & Technology

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

Trades & Technology

Cite four statistics that demonstrate the importance of transportation in the United States.

What will be an ideal response?

Trades & Technology

Used coolant should be ________

A) Reused B) Recycled C) Disposed of properly D) Either B or C

Trades & Technology

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

Trades & Technology