Frontier SE King Cab 4WD V6-3.3L (VG33E) (1999)
In some wiring diagrams, two kinds of lines, representing wires with different weight are used.
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A line with regular thickness (wider line) represents a "detectable line for DTC (Diagnostic Trouble Code)". A "detectable line for DTC" is a
circuit in which ECM can detect malfunctions with the on-board diagnostic system.
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A line with less thickness (thinner line) represents a "non- detectable line for DTC". A "non-detectable line for DTC" is a circuit in which ECM
cannot detect malfunctions with the on-board diagnostic system.