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Home >> Toyota >> 1984 >> 4Runner Base >> Repair and Diagnosis >> Engine Performance >> System >> ECS Engine Control System >> Diagnosis & Testing >> Recalling Trouble Codes >> Entering Diagnostic Mode
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Entering Diagnostic Mode

  1. Prior to entering diagnostic mode, the following conditions must be met: Engine must be at normal operating temperature, battery voltage above 11 volts, transmission in Neutral, throttle valve fully closed and A/C off.
  2. Turn ignition on, but DO NOT start engine. Remove rubber cap from "CHECK ENGINE" connector. See Fig 2. Using a jumper wire, jumper both terminals of the connector together.
Fig 1: Example of Trouble Code Output
G42442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: Output is in the form of voltmeter needle fluctuations.
Fig 2: Jumping "CHECK ENGINE" Connector
G42443Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: Insert the jumper wire into the "CHECK ENGINE" connector.
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