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Circuit K4 splices to supply ground for the signals from the following:
- Battery temperature sensor
- Camshaft position sensor
- Crankshaft position sensor
- Downstream heated oxygen sensor
- Engine coolant temperature sensor
- Fuel pump module
- Manifold absolute pressure sensor
- Oil pressure sensor
- Powertrain control module
- Throttle position sensor
- Transmission solenoid assembly
- Upstream heated oxygen sensor
- Vehicle speed control switch
- Vehicle speed sensor