Component Testing
WARNING: This page is about a different car, the 2009 GMC Yukon and 2009 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the AT 20-way inline connector and measure the resistance between the TFT sensor signal circuit and the low reference circuit. Refer to Temperature Versus Resistance
for resistance values.
- If the resistance is not within the specified range for the given temperature, replace the TFT sensor.
- Test the TCM for supplying the 5-volt reference circuit to the TFT sensor.
- If the TCM is not supplying a 5-volt reference to the TFT sensor, replace the TCM.