Connect GDS to Data Link Connector(DLC).

Ignition "ON"

Monitor "Diagnostic Trouble Codes(DTC)" with GDS.

Is DTC status displayed as Present?

Fig.1) Diagnostic Trouble Code(DTC) is shown above

	▶ Go to "Monitor GDS Data" procedure.
	▶ Go to "Verification of Vehicle Repair" procedure.

Connect GDS to DLC(Data Link Cable).

Warm up the engine to normal operating temperature.

Check the "Current Data" about related DTC with GDS.

Fig.1) Engine Idle on Cold Condition

A: HO2S(S1) performs Max Heater(Approx. 87%) after Engine Cold-start.

Lambda Control is performed after Engine Cold-start after 14 sec.

Fig.2) Engine Idle after Warm Up

Are the parameters displayed correctly?

	▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.
	▶ Go to "Terminal and Connector Inspection" procedure.