The Transmission Output Shaft Speed Sensor produces an AC voltage. A labscope may show an acceptable waveform but often the resistance of the sensor is high enough to reduce the output voltage so that the transmission control module (TCM) does not recognize the signal. Disconnect the 2-wire connector from the Transmission Output Shaft Speed Sensor. Measure the resistance of the Transmission Output Shaft Speed Sensor. If the resistance is higher than 800 ohms, replace the Transmission Output Shaft Speed Sensor.

The Transmission Output Shaft Speed Sensor produces an AC voltage. A labscope may show an acceptable waveform but often the resistance of the sensor is high enough to reduce the output voltage so that the transmission control module (TCM) does not recognize the signal. Disconnect the 2-wire connector from the Transmission Output Shaft Speed Sensor. Measure the resistance of the Transmission Output Shaft Speed Sensor. If the resistance is higher than 800 ohms, replace the Transmission Output Shaft Speed Sensor.

If all Instrument Cluster Gauges are inoperative.

When the problem is occurring, perform the Instrument Cluster self test. Begin with the ignition key switch in the off position. Press and hold in the Odometer Trip and Reset buttons. Turn the key to the On position. Wait until the word CODE appears in the Odometer window, then release the buttons. A normal self test will step through turning all of the indicator lights on and off and sweeping all of the gauge needles. If this does not happen, the test has failed. If the self test fails, check the Power, Ground and Bus wires at the 13 cavity connector behind the Cluster with the key on. There should be 12 volts on the Pink wire at cavity 2 and the Red/White Wire at cavity 11. There should be good ground available on the Black/Light Green wire at cavity 7 and the Black wire at cavity 13. The White/Black wire at cavity 9 and the Violet/Brown wire at cavity 10 are both Bus wires. Each of them should have approximately 2.5 volts. If these all check OK, replace the Instrument Cluster Circuit Board. NOTE: After replacing the Circuit Board, the gauges will require recalibration using the DRB III factory scan tool. At the time of this writing no aftermarket scanner is known to be able to perform the gauge recalibration.