Heated Oxygen Sensor No. 1

WARNING: This page is about a different car, the 2002 Suzuki XL-7, 2002 Suzuki Vitara, 2002 Suzuki Grand Vitara, 2002 Suzuki Esteem, and 2002 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.

Start engine and allow it to reach normal operating temperature. Pull back seal at Heated Oxygen Sensor (HO2S) NO. 1 connector. Using DVOM, backprobe HO2S No. 1 connector between sensor signal and sensor ground terminals. See Fig 1 .

Fig 1: Identifying Heated Oxygen Sensor (HO2S) No. 1 & 2 Connector Terminals
Courtesy of SUZUKI OF AMERICA CORP.
Increase engine speed to 2000 RPM and hold for about one minute while observing voltmeter. Reading should fluctuate between zero and one volt, without being constantly high or low. If voltage is not as specified, see DTCs P0131 and P0132 in appropriate SELF-DIAGNOSTICS article.