Diagnostic Test Mode II-Front Heated Oxygen Sensor Monitor

DIAGNOSTIC TEST MODE II
1. SELF-DIAGNOSTIC RESULTS:
By using this function, the diagnostic trouble codes can be read.
2. FRONT HEATED OXYGEN SENSOR MONITOR: In this mode, the fuel mixture condition (lean or rich) monitored by front heated oxygen sensor can be read.





DIAGNOSTIC TEST MODE II-FRONT HEATED OXYGEN SENSOR MONITOR
In this mode, the MALFUNCTION INDICATOR LAMP displays the condition of the fuel mixture (lean or rich) which is monitored by the front heated oxygen sensor.
To check the front heated oxygen sensor function, start engine in the Diagnostic Test Mode II and warm it up until engine coolant temperature indicator points to the middle of the gauge.
Next run engine at about 2,000 rpm for about 2 minutes under no-load conditions. Then make sure that the MALFUNCTION INDICATOR LAMP comes ON more than 5 times within 10 seconds with engine running at 2,000 rpm under no-load.





HOW TO SWITCH MONITORED SENSOR FROM LEFT BANK TO RIGHT BANK OR VICE VERSA
- The following procedure should be performed while the engine is running.
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.