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Home >> Toyota >> 2001 >> 4Runner Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0300: Random Misfire Detected >> Test Drive Confirmation
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Test Drive Confirmation

  1. Connect Toyota hand-held tester or scan tool to Data Link Connector (DLC) No. 3. See Figure. Check for any DTCs and read FREEZE FRAME data. Record DTCs and freeze frame data. If using hand-held tester, switch hand-held tester to CHECK mode.
  2. Drive vehicle several times with engine speed, load and its surrounding range shown with ENGINE SPD, CALC LOAD in freeze frame data or MISFIRE RPM and MISFIRE LOAD in the data list on hand-held tester or scan tool.
  3. Allow engine to idle for at least 3 1/2 minutes and then drive vehicle at specified engine speeds for specified amount of time. See DRIVING PATTERN  table. If using scan tool, turn ignition off after symptom is simulated the first time, then repeat test drive again. If using hand-held tester or scan tool, if a misfire is detected, a DTC will set and misfire will be indicated in freeze frame data. Turn ignition off and wait a minimum of 5 seconds.
    DRIVING PATTERN

    RPM Specified Time
    1000 3 Minutes Or More
    2000 1 1/2 Minutes Or More
    3000 1 Minute Or More
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