P1584 Throttle Control Unit Input Circuit Malfunction

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Contour, Mystique, early electronic-throttle Fords

What does P1584 mean on a Ford?

P1584 — Throttle Control Unit Input Circuit Malfunction. This Ford-enhanced code applies to Contour, Mystique, early electronic-throttle Fords.

Common causes of P1584

Open TCU input circuit
Corroded TCU connector
Failed input sensor
Wiring damage
TCU fault

How to fix P1584

Test input circuit continuity
Inspect the TCU connector
Verify input sensor output
Check TCU power and ground
Repair wiring or replace the unit