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Home >> Lexus >> 2003 >> RX 300 AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0442: Evaporative Emission Control System Leak Detected (Small Leak) & DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak) >> Confirmation Readiness Test

Confirmation Readiness Test

  1. For FIRST TRIP PROCEDURE, vehicle must be cold with ambient temperature approximately 50-95°F (10-35°C). Intake Air Temperature (IAT) sensor and Engine Coolant Temperature (ECT) sensor should have almost the same value. Clear DTCs by disconnecting the battery terminals or EFI fuse. Readiness tests will show INCMPL (incomplete). Test drive vehicle in city and freeway traffic. Note the state of readiness tests. They will change to COMPL as the evaluation monitors operate and if the system passes. This procedure may take approximately 20 minutes or more. Do not shut off the engine as results will be invalid. See Fig 1-Fig 8 .
  2. For PASS CONDITION-NO PROBLEM FOUND BY ECM, if the EVAP evaluation monitor shows COMPL, go to Non- Continuous Test screen. To get there, go to ADVANCED OBD-II, ONBOARD TESTS, NON-CONTINUOUS TESTS. If all of the tests show PASS, the evaluation monitor has operated and no problem was detected.
  3. For FAIL CONDITION-PROBLEM DETECTED BY THE ECM, if the EVAP evaluation monitor shows INCMPL, go to the NON-CONTINUOUS TEST screen. If all tests show PASS, the following may have occurred: EVAP evaluation monitor did not operate, EVAP evaluation monitor did not finish, or ECM withheld judgement. If one or more of the tests show FAIL, EVAP evaluation monitor did operate and ECM detected a problem. Go to CONTINUOUS TESTS screen. This is the only place DTCs are listed for the first trip. DTC listed may not be valid. A second trip is needed to confirm the DTC.
  4. For SECOND TRIP PROCEDURE, vehicle must be cold with ambient temperature at approximately 50-95°F. Go to READINESS TESTS screen. Drive the vehicle according to LA#4 drive cycle (city and freeway driving). Note state of EVAP evaluation monitor. This procedure may take approximately 20 minutes or more. Do not shut off the engine as results will be invalid. If READINESS TESTS changes to COMPL, the EVAP evaluation monitor has operated. Check for any stored DTCs. If a DTC has been stored, the problem has been detected and confirmed by the ECM. If no DTC was found, the EVAP monitor operated but no problem was detected.
Fig 1: Confirmation Readiness Test (1 Of 8)
G00165077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Confirmation Readiness Test (2 Of 8)
G00165078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Confirmation Readiness Test (3 Of 8)
G00165079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Confirmation Readiness Test (4 Of 8)
G00165080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Confirmation Readiness Test (5 Of 8)
G00165081Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 6: Confirmation Readiness Test (6 Of 8)
G00165082Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 7: Confirmation Readiness Test (7 Of 8)
G00165083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 8: Confirmation Readiness Test (8 Of 8)
G00165084Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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