Description & Operation
Throttle Body Injected (TBI) vehicles equipped with a 5.2L or 5.9L engine have a Throttle Body Temperature (TBT) sensor. The sensor monitors throttle body temperature, which is the same as fuel temperature. It is mounted on the throttle body. This sensor provides the ECM with information on fuel temperature, which allows the ECM to richen the air/fuel mixture for a hot restart condition.
- Disconnect the negative battery cable. Remove the engine cover.
- Unplug the electrical connector at the sensor.
- Using an ohmmeter, measure the resistance across the two terminals of the sensor. The sensor resistance should be less than 1340 ohms with the engine at normal operating temperature. Replace the sensor if not within specifications.
- To test the wiring harness, unplug the ECM; test the harness between the proper ECM connector terminal and the sensor connector. If resistance is more than 1 ohm, repair the wiring harness.
Install the engine cover. Connect the negative battery cable.