Component Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
- Test the fuel composition using the J 44175 - A Fuel Composition Tester and the J 44175 - A Instruction Manual. Record the frequency.
- Compare the special tool test frequency and the scan tool Fuel Composition Sensor frequency parameter.
- Verify the difference between the tool and the sensor is 12 Hz or less.
- If greater then 12 Hz
Replace the B198 Fuel Composition Sensor.
- Go to next step: If 12 Hz or less
- If greater then 12 Hz
- All OK.