Q45t V8-4130cc 4.1L DOHC MFI (VH41) (1997)
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How To Read Wiring Diagrams - Description (Part 2 Of 2)
DETECTABLE AND NON-DETECTABLE LINES
Detectable Lines And Non-Detectable Lines
In some wiring diagrams, two kinds of lines, representing wires with different weight are used.
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A line with regular weight (wider line) represents a "detectable line for DTC (Diagnostic Trouble Code)". A "detectable line for DTC" is a circuit
in which Engine Control Module ECCS control module (ECM) can detect its malfunctions with the on-board diagnostic system.
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A line with less weight (thinner line) represents a "non- detectable line for DTC". A "non-detectable line for DTC" is a circuit in which ECM
