VISUAL INSPECTION
Visually inspect all electrical wiring, looking for chafed, stretched, cut or pinched wiring. Ensure electrical connectors fit tightly and are not corroded. Ensure vacuum hoses are properly routed and are not pinched or cut. See VACUUM DIAGRAMS article to verify routing and connections (if necessary). Inspect air induction system for possible vacuum leaks.
FUEL PUMP TEST
Turn ignition off. On all models except Sonata 2.5L, apply battery voltage to fuel pump check terminal connector. (Scheme 1) On Sonata 2.5L, turn ignition on. On all models, remove fuel tank cap and listen for fuel pump operation. Pinch fuel hoses by hand, and ensure fuel pressure can be felt.
Scheme 1
ECM CONTROL RELAY TEST
| CAUTION | When applying direct battery voltage, ensure voltage is applied to correct terminal to prevent relay damage. |