2002 Cadillac Escalade EXTFACTORY OEM SERVICE PROCEDURE

Diagnostic Aids

Inspect for the following conditions:

  • A skewed high Throttle Position (TP) sensor.
  • Restricted air intake system.
  • Objects blocking the IAC passage or throttle bore.
  • The correct Positive Crankcase Ventilation (PCV) valve.
  • A properly installed PCV valve.
  • Proper operation of the PCV valve.
  • Proper operation and installation of all air intake components.
  • Proper installation and operation of the Mass Air Flow (MAF) sensor, if equipped.
  • Evidence of damage or tampering of the following components:
    1. The throttle stop screw.
    2. The throttle plate.
    3. The throttle shaft.
    4. The throttle linkage.
    5. The cruise control linkage, if equipped.
  • Excess deposits in the IAC passage or on the IAC pintle.
  • Excess deposits in the throttle bore or on the throttle plate Vacuum leaks.
  • Excess load on engine, such as energy-draining conditions of the transmission, power steering, or alternator.
  • A high or unstable idle condition. This condition could be caused by a non-IAC system problem that can not be overcome by the IAC valve. See TROUBLE SHOOTING - NO CODES - TRUCKS article.
  • A low or unstable idle condition. This condition could be caused by a non-IAC system problem that can not be overcome by the IAC valve. See TROUBLE SHOOTING - NO CODES - TRUCKS article.
  • An intermittent condition.

RPM VARIATION LIMITS

Engine Maximum RPM Less Than Commanded RPM Maximum RPM More Than Commanded RPM
2.2L (A/T) 60 60
2.2L (M/T) 100 60
3.4L 100 150
4.3L, 4.8L, 5.0L, 5.3L, 5.7L & 6.0L 100 200
Fig 1: Identifying IAC Valve Harness Connector Terminals
G99F03044Courtesy of GENERAL MOTORS CORP.
Chapter Navigation
Return to Chapter: Idle Air Control System Diagnosis
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.