INSPECTION PROCEDURE 1. INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY
(b) Check that the switch illuminates. OK:
If the result is not as specified, replace the back sonar or clearance sonar switch assembly. Text in Illustration
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Toyota Tundra Service Manual > Sfi System: Catalyst System Efficiency Below Threshold (Bank 1) (P0420,P0430)
MONITOR DESCRIPTION The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the Air-Fuel Ratio (A/F) sensor, sends pre-catalyst information to the ECM. The second sensor, the Heated Oxygen (HO2) sensor, sends post-catal ...