Identifying Cut Engine Harness Wires - Starter Circuit and Rear Knock Sensor

Electricalintermediate✓ OP Confirmed

Problem

Two wires found cut or broken on the engine wiring harness after motor pull. One black with blue stripe wire was cleanly cut, and one brown wire (appeared clear/discolored where stretched and broken) was disconnected with no obvious destination.

Black with blue stripe wire found cleanly cut on engine harnessBrown wire found stretched and broken on engine harness, discolored to appear clear where exposedBoth wires are thicker gaugeWires branch off the main harness near the transmission sensor wires

Root Cause

During a previous engine pull, two engine harness wires were severed: the black/blue starter circuit wire (STA signal from ECU that tees into the cold start injector time switch and neutral start switch) and the rear knock sensor shielded wire (which had discolored from brown to a lighter/clear appearance where exposed).

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted March 2021 on SupraForums.com