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