LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Audi >> 2002 >> S4 Quattro, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Computerized Engine Controls >> Engine Control Module Power Supply
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Control Module Power Supply

NOTE: Voltage is supplied to Engine Control Module (ECM) at ECM harness connector terminal No. 3 (ignition voltage) and No. 62 (battery voltage). Ground is supplied to ECM at ECM harness connector terminals No. 1 and 2. ECM voltage supply relay is located in left rear corner of engine compartment, in electronics box.

To test ECM power supply, see ECM power supply related DTC(s) under DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

scientia non olet · About LEMON Manuals