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Home >> Toyota >> 2001 >> Highlander Base, 2.4 D, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 4-Cylinder >> Diagnostic Tests >> DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control >> Test Drive Confirmation

Test Drive Confirmation

  1. Connect Toyota hand-held tester to Data Link Connector (DLC) No. 3. See Figure. Start engine and allow engine to idle for 100 seconds or more.
  2. Drive vehicle at 24 MPH or more for 20 seconds or more. Let engine idle for 20 seconds or more. Repeat driving and idling portion of procedure 3 more times. Let engine idle for 30 seconds or more. Using hand-held tester, check A/F sensor voltage. If malfunction exists, MIL will illuminate.
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