01 / GUIDE

Measure the installation route

Record ECU position, connector endpoints, branch lengths and service loops. Plan around heat, moisture, vibration and moving parts before selecting sleeve and connector requirements.

02 / GUIDE

Keep the pin map traceable

Use a worksheet linking connector ID, cavity number, signal name and wire label. Note whether a drawing shows the mating face or wire-entry side; the viewing direction can change the apparent layout.

03 / GUIDE

Follow the correct grounding diagram

Distinguish power grounds, sensor returns and shields using the exact ECU manual. Avoid transferring a grounding layout from a different model simply because the connector looks similar.

04 / GUIDE

Define inspection and delivery records

Request the final pin map, connector list and agreed continuity-check record with the harness. Identify which terminations remain for the installer and which connections are supplied complete.

Checklist & example

  • Vehicle: market / year / model. Engine: code and any swap.
  • Original ECU: part number. Target ECU: model and hardware revision.
  • Wiring: both connector faces and pinout. Retained functions: list individually.