Troubleshooting High Idle on a 90 Series V6

Toyota Prado 90 Series
1

Introduction

This guide provides troubleshooting steps for addressing a high idle issue (around 1200 RPM) on a 2000 model 90 series V6 Toyota Land Cruiser Prado.

Problem

The engine idles consistently high at approximately 1200 RPM despite recent maintenance.

Solution

  1. Check for Air Leaks: Inspect the Idle Air Control (IAC) valve and surrounding hoses for any potential air leaks. Ensure the throttle body is securely mounted. A loose connection or damaged hose can introduce unwanted air into the system, causing a high idle.
  2. Inspect IAC Valve Connection: Confirm the IAC valve is properly connected. A disconnected IAC can lead to inconsistent idle speeds. The IAC valve is located beneath the throttle body.
  3. ECU Reset: Disconnect the vehicle’s battery for a short period (e.g., 15-30 minutes). Reconnecting the battery will reset the Engine Control Unit (ECU) to its base programming. This can help clear any learned settings that may be contributing to the high idle.

This technical summary was auto-generated based on recovered archives. Do not rely on its factual accuracy. Refer to the original thread. Source: View Original Conversation

Continue the discussion below.