29. Check CO%

Without CONSULT-II 

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. Turn ignition switch OFF.
3. Disconnect engine coolant temperature sensor harness connector.
4. Connect a resistor (4.4 kΩ) between terminals of engine coolant temperature sensor harness connector.
Fig 1: Connecting Resistor To Engine Coolant Temperature Sensor Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
5. Start engine and rev it (2,000 to 3,000 RPM) two or three times under no load, then run engine at idle speed.
6. Check CO%.
   1. Idle CO: 0.7 - 9.9% and engine runs smoothly. 
7. After checking CO%, turn ignition switch OFF, disconnect the resistor from the terminals of engine coolant temperature sensor harness connector, and then connect engine coolant temperature sensor harness connector to engine coolant temperature sensor.

OK or NG 

OK : GO TO 31 REPLACE HEATED OXYGEN SENSOR 1 .

NG : GO TO 30.