Circuit Insulation Check

WARNING: This page is about a different car, the 2008 Suzuki Grand Vitara, 2007 Suzuki Grand Vitara, and 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect connector from HO2 sensor.
Using ohmmeter, check circuit insulation of HO2S sensor. If faulty is found, replace HO2S sensor.
- Between each heater terminal (1) and other than heater terminals (2).
  
  Fig 1: Checking Resistance Between HO2S Heater Terminals No. 1 & 2
  Courtesy of SUZUKI OF AMERICA CORP.
- Between each terminal ((1), (2), (3) and (4)) of HO2S sensor and HO2S sensor body (5).
  
  Fig 2: Checking Resistance Between Terminals Of HO2S Sensor & HO2S Sensor Body
  Courtesy of SUZUKI OF AMERICA CORP.
Connect HO2S sensor connector securely.