Description
The "B" terminal is constantly supplied with battery power.
Diagnosis Procedure
CAUTION: Perform diagnosis under the condition that the engine cannot start by the following procedure.
1.CHECK TERMINAL B POWER SUPPLY VOLTAGE
B - ground Battery voltage
2.CHECK BATTERY CABLE (VOLTAGE DROP TEST)
While cranking the engine Terminal B - B+ terminal Less than 0.5V
3.CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
While cranking the engine Starter case - B- terminal Less
P0420, P0430 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 sto ...
Preparation
Special Service Tool
The actual shapes of the tools may differ from those illustrated here.
Commercial Service Tool
Sealant and/or Lubricant
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Clip list
Descriptions for Clips
Replace any clips which are damaged during removal or installation.
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