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Home >> Toyota >> 2001 >> Prius >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control >> Test Drive Confirmation
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Test Drive Confirmation

  1. Test drive confirmation may be performed to operate vehicle under conditions which may cause DTC to be set. If using Toyota hand-held tester, go to next step. If Toyota hand-held tester is not available, go to step  4.
  2. Connect hand-held tester to Data Link Connector (DLC) No. 3. See Figure. Switch hand-held tester from NORMAL mode to CHECK mode. Go to next step.
  3. Start engine and allow engine to idle for at least 30 seconds. Drive vehicle at a constant speed for at least 36 seconds. Check operation of Malfunction Indicator Light (MIL). If MIL illuminates, malfunction exists and DTC is set. If MIL does not illuminate, malfunction does not exist.
  4. Start engine and allow engine to idle for at least 30 seconds. Drive vehicle at a constant speed for at least 36 seconds. Turn ignition off.
  5. Start engine and allow engine to idle for at least 30 seconds. Drive vehicle at a constant speed for at least 36 seconds. Check operation of Malfunction Indicator Light (MIL). If MIL illuminates, malfunction exists and DTC is set. If MIL does not illuminate, malfunction does not exist.
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