Component Inspection

HO2S Test:

PROCEDURE 1 - AT COMPONENT
1. Check resistance between terminals (a) and (c).
Resistance: 3 - 1,000 Ohms
2. If N.G., replace heated oxygen sensor.

L.E.D. Display Table:

PROCEDURE 2 - USING ON-BOARD DIAGNOSTICS
On-board Diagnostic System - Diagnostic Test Mode II (Heated oxygen sensor monitor)
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.

How To Switch Diagnostic Test Modes:

SWITCHING DIAGNOSTIC TEST MODES
1. Set Diagnostic Test Mode II. (Refer to image)
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.

NOTES:
^ Turn back diagnostic test mode selector to the fully counterclockwise position whenever vehicle is in use.
^ Switching the modes is not possible when the engine is running.
^ When the ignition switch is turned off during diagnosis in each mode, and then turned back on again after power to the ECM has dropped off completely, the diagnosis will automatically return to Diagnostic Test Mode I.