High Or Low Idle

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 Nissan Xterra, 2002 Nissan Sentra, 2002 Nissan Quest, 2002 Nissan Pathfinder, and 2002 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Unless otherwise indicated, see appropriate SYSTEM & COMPONENT TESTING article for testing procedures.

Check idle speed and throttle position sensor adjustment. See THROTTLE POSITION SWITCH, IGNITION TIMING & IDLE SPEED in ON-VEHICLE ADJUSTMENTS article.
Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
Check fuel injector circuits.
Check Idle Air Control Valve-Fast Idle Control Device (IACV-FICD) (where equipped).
Check Exhaust Gas Recirculation (EGR) system.
Check PCV system.
Check fuel pressure regulator. See FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article.
Check EVAP system.
Check Engine Coolant Temperature (ECT) sensor circuit.
Check Throttle Position (TP) sensor circuit.
Check Camshaft Position (CMP) sensor circuit.
Check Mass Airflow (MAF) sensor circuit.
Check knock sensor circuit.
Check for vacuum leaks.
Check throttle body and throttle cable.
Ensure cooling system is reaching normal operating temperature.