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Home >> Toyota >> 2003 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Engine Control System Self-Diagnostics - V8) >> Diagnostic Tests >> DTC P0171: System Too Lean Or DTC P0172: System Too Rich >> Test Drive Confirmation
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Test Drive Confirmation

WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Test drive confirmation may be performed to operate vehicle under conditions which may cause DTC to be set. When performing test drive confirmation, procedures must be performed exactly as listed or the malfunction may not be detected. 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 at driver's side of instrument panel. See Figure. Switch hand-held tester from NORMAL mode to CHECK mode.
  3. Start engine and allow engine to idle for at least 100 seconds. Drive vehicle at 24 MPH or more for at least 20 seconds and then allow engine to idle for at least 30 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 100 seconds. Drive vehicle at 24 MPH or more for at least 20 seconds and then allow engine to idle for at least 30 seconds.
  5. Turn ignition off. Repeat step  4 again and then 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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