DTC P0507 (ISC_H) - Idle Control System Rpm Higher Than Expected
- Connect SSM. Retrieve DTC(s). If DTC P0505 is present, diagnose this DTC first. If DTC P0505 is not present, go to next step.
- Start and allow engine to idle. Check intake manifold, idle air control solenoid valve and throttle body for loose installation and gasket for cracks, by-pass hose for loose connection or cracking and vacuum hoses for disconnection or cracking. Repair as necessary. If no damage is noted, replace idle air control solenoid valve.