DTC Confirmation Test (Overall Function Check)

Malfunction is detected when ECM does not operate in closed loop. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM harness connector terminal No. 50 (right bank), or No. 51 (left bank) by backprobing. See Figure. Monitor voltmeter with engine at 2000 RPM. Voltage should be less than .21 volt at least once and more than .70 volt at least once.