SYSTEM DIAGRAM The configuration of the electronic control system for the A760E automatic transmission is as shown in the following chart. 
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Toyota Tundra Service Manual > Sfi System: Control Module Performance (P0607)
DESCRIPTION The ECM continuously monitors its internal processors (CPUs) and heated oxygen sensor (HO2S) transistors. This self-check ensures that the ECM is functioning properly. DTC No. DTC Detection Condition Trouble Area P0607 Either condition is met: ECM CPU malfunction HO2S transistor malfunct ...
