O2 Monitor

DESCRIPTION

In this mode, the MALFUNCTION INDICATOR LAMP and RED L.E.D. display the condition of the fuel mixture (lean or rich) which is monitored by the heated oxygen sensor.

If two heated oxygen sensors (right side and left side) are fitted on the engine, the left side heated oxygen sensor monitor operates first, when selecting this mode.





HOW TO CHANGE MONITOR FROM LEFT SIDE (Right side) TO RIGHT SIDE (Left side)

1. Turn diagnostic test mode selector on ECM fully clockwise.

2. Wait at least 2 seconds.

3. Turn diagnostic test mode selector on ECM fully counterclockwise.

^ These procedures should be carried out when the engine is running.

HOW TO CHECK HEATED OXYGEN SENSOR

1. Set Diagnostic Test Mode II. (Refer to "HOW TO SWITCH DIAGNOSTIC TEST MODES".)

2. Start engine and warm it up until engine coolant temperature indicator points to the middle of the gauge.

3. Run engine at about 2,000 rpm for about 2 minutes under no-load conditions.

4. Make sure RED L.E.D. or MALFUNCTION INDICATOR LAMP goes ON and OFF more than 5 times every 10 seconds; measured at 2,000 rpm under no-load.