FI SYSTEM DIAGNOSIS
“C40” (P0505-H/L or P0506 and P0507) ISC VALVE CIRCUIT MALFUNCTION C40 P0505
DETECTED CONDITION ISC valve motor current is higher than H the specified value. ISC valve motor circuit is open. L
POSSIBLE CAUSE • ISC valve circuit shorted to BATT or ground circuit open • ISC valve circuit open or shorted to ground or BATT circuit open Idle speed is lower than the desired idle • W/Y or Lg wire open or short speed. • ISC valve is fixed • Air curcuit clogged Idle speed is higher than the desired • W/Y or Dgr wire open or short idle speed. • Disconnected ISC valve hose
ISC valve Lbl
" Be careful not to disconnect at least 3 seconds after ignition switch is turned to OFF. If the ECM coupler is disconnected within 3 seconds after ignition switch is turned to OFF, there is a possibility of an usual valve being written in ECM and causing an error of ISC valve operation.
Published on Jun 12, 2011