2002 Toyota 4Runner BaseFACTORY OEM SERVICE PROCEDURE

Malfunction Indicator Light Inspection

NOTE: Malfunction Indicator Light (MIL) may also be referred to as CHECK ENGINE light. Inspect MIL to ensure it is operational and will come on if a Diagnostic Trouble Code (DTC) is set.
  1. Turn ignition on. Check that MIL comes on and remains on. MIL is displayed as an engine icon located just below the tachometer on instrument cluster on instrument panel. If MIL comes on and remains on, go to next step. If MIL does not come on, check bulb circuit on instrument cluster and Violet wire and electrical connectors between MIL and Engine Control Module (ECM). See WIRING DIAGRAMS article. ECM is located behind glove box. See Figure.
  2. Start engine and ensure MIL goes off. If MIL goes off, no malfunction is detected at this time. If MIL remains on or blinks with engine running, a malfunction is detected. Proceed to TESTING PROCEDURE .
Factory Service Tools

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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.

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