Conditions for Running the DTC
- DTCs P0030, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0130, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0325, P0327, P0336, P0341, P0401, P0403, P0404, P0405, P0442, P0443, P0446, P0449, P0455, P0496, P0502, P0503, P0506, P0507, P1133, P1134, P1351, P1352, P1361, P1374 are not set.
- The engine has been running for more than 10 minutes.
- The engine speed is within 150 RPM above or 127 RPM below the desired idle.
- The engine coolant temperature (ECT) is between 75-126°C (167-259°F).
- The barometric pressure (BARO) is more than 74 kPa.
- The vehicle is in Closed Loop.
- The intake air temperature (IAT) is between -20 and +100°C (-4 and +212°F).
- The battery voltage is more than 10.7 volts.
- The throttle position (TP) is 1.5 percent or less.
- The short term fuel trim (FT) is between -10 and +10 percent.
- The engine load must be stable.
- Warm the catalyst by performing the following procedures:
- Fully open the hood.
- Place the transaxle in PARK for automatic transaxle.
- Place the transaxle in NEUTRAL for manual transaxle, with clutch pedal pressed.
- Set the parking brake.
- Press and hold the service brake.
- Each time the engine is started the diagnostic can run up to 18 times if the tests are a combination of passes and failures. If each subsequent test is a pass, the diagnostic will run a maximum of six times. The first test may be run after the initial warm up period of 10 minutes. Maintain engine speed between 1,500-2,500 RPM in park or neutral for 1 minute. Allow the engine to return to a stabilized idle. Shift into DRIVE for an automatic transmission, without touching the accelerator in order for the test to run. Between each subsequent test, maintain engine speed between 1,500-2,500 RPM in PARK or NEUTRAL for 1 minute. Allow the engine to return to a stabilized idle. Shift into DRIVE for an automatic transmission, without touching the accelerator in order for the test to run.
- Test the catalyst by performing the following procedures:
- Idle the engine and place the vehicle in DRIVE, or press the clutch pedal for a manual transmission vehicle, to activate the diagnostic. Within 60 seconds, the air fuel ratio will transition rich, below 13.7, for up to 7 seconds, and then may transition lean, above 16, for up to 7 seconds.
- Verify if DTC P0420 has passed or failed this ignition cycle with the scan tool.