DTC Troubleshooting

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

NOTE: Before this trouble shooting is performed, read the precautions for DTC troubleshooting by referring to PRECAUTIONS FOR DTC TROUBLESHOOTING .

TROUBLESHOOTING TABLE

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 (bank-1) 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 and poor connection.	Go to Step 3.
3	A/F sensor circuit check Disconnect connector from A/F sensor (bank-1) with ignition switch turned OFF. Check for proper terminal connection to A/F sensor (bank-1) connector and ECM connector. If connections are OK, check that A/F sensor (bank-1) circuit is as follows. Wiring harness resistance of each "Signal (+) circuit of A/F sensor (bank-1)", "Signal (-) circuit of A/F sensor (bank-1)", "Control circuit of A/F sensor (bank-1) heater" and "Control ground circuit of A/F sensor (bank-1) heater" is less than 1 Ω. Are they in good condition?	Go to Step 4.	Repair or replace defective wiring harness.
4	A/F sensor heater check Check heater resistance of A/F sensor (bank-1) by referring to AIR FUEL RATIO (A/F) SENSOR ON-VEHICLE INSPECTION . Is A/F sensor heater in good condition?	Substitute a known good ECM and recheck. If ECM OK, replace A/F sensor (bank-1).	Replace A/F sensor (bank-1).