DTC Troubleshooting

WARNING: This page is about a different car, the 2007 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

DTC TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2	A/F sensor signal check Connect scan tool with ignition switch turned OFF. Warm up engine to normal operating temperature and keep it at 2000 r/min. for 60 sec. Repeat racing engine (Repeat depressing accelerator pedal 5 to 6 times continuously to enrich A/F mixture and take foot off from pedal to enlean it). Check for A/F sensor output current displayed on scan tool. Does A/F sensor output current between -0.2 mA and 0.2 mA?	Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION	Go to Step 3.
3	A/F sensor circuit check Disconnect connector from A/F sensor with ignition switch turned OFF. Check for proper terminal connection to A/F sensor connector and ECM connector. If connections are OK, check that A/F sensor circuit is as follows. Wiring harness resistance of each "Signal (+) circuit of A/F sensor", "Signal (-) circuit of A/F sensor", "Control circuit of A/F sensor heater" and "Control ground circuit of A/F sensor heater" is less than 1 Ω. Are they in good condition?	Replace A/F sensor and recheck. If this DTC is detected again, substitute a known-good ECM and recheck.	Repair or replace defective wiring harness / connector.