Diagnostic Test

WITH GST

1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Open engine hood.
6. Check the voltage between ECM harness connector terminals under the following conditions.

   DTC	ECM				Condition	Voltage
   	+		-
   	Connector	Terminal	Connector	Terminal
   P0420	F92	84 [HO2S2 (bank 1)]	F91	43	Keeping engine speed at 2, 500 rpm constant under no load	The voltage fluctuation cycle takes more than 5 seconds. 1 cycle: 0.6 - 1.0 → 0 - 0.3 → 0.6 - 1.0
   P0430		77 [HO2S2 (bank 2)]

Is the inspection result normal?

YES 

INSPECTION END

NO 

Go to DIAGNOSIS PROCEDURE .