SYSTEM DIAGRAM 
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Toyota Tundra Service Manual > Meter / Gauge System: Lost Communication with ECM / PCM "A" (U0100)
DESCRIPTION The combination meter communicates with the ECM via the CAN line. DTC Code DTC Detection Condition Trouble Area U0100 When either of following conditions is detected: Vehicle speed 5 km/h (3 mph) or more and IG voltage 10.5 V or more No communication with ECM continues for 3 seconds or m ...
