PrecautionP0420 Three way catalyst function
DTC Logic
DTC DETECTION LOGIC
The ECM monitors the switching frequency ratio of air fuel ratio (A/F)
sensor 1 and heated oxygen sensor 2.
A three way catalyst (manifold) with high oxygen storage capacity
will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage c ...
Description
NOTICE:
Trouble diagnoses indicate work procedures required to diagnose problems
effectively. Observe the following
instructions before diagnosing.
Before performing trouble diagnoses, read the “Work Flow” in each
section.
After repairs, re-check that the problem has been comp ...
System description
Component parts
Component part location
ECM
IPDM E/R
BCM (view with instrument panel removed)
A/C auto amp. (view with A/C switch
assembly removed)
A/C switch assembly
A/C Compressor
Refrigerant pressure sensor (view
with front bumper fascia removed)
Ambient sensor
S ...