ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT REAR BODY TAIL GATE ASSEMBLY (a) Check that the clearance measurements of areas A to B are within the standard range. 
Standard measurement:
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Toyota Tundra Service Manual > Forward Recognition Camera System: Lost Communication with ECM / PCM "A" (U0100,U0101,U0123,U0126,U0129,U0142,U0155)
DESCRIPTION When a malfunction is detected between various ECUs and sensors, these DTCs are stored. DTC No. Detection Item DTC Detection Condition Trouble Area U0100 Lost Communication with ECM / PCM "A" After the ignition switch is turned to ON for 3 seconds or more, when the vehicle is being drive ...
