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Theory of Operation The Sensor Supply Voltage circuit supplies a 6 volt power supply for the two input speed sensors. The Sensor • When Monitored: • Set Condition: Possible Causes (T72) SENSOR SUPPLY VOLTAGE CIRCUIT SHORT TO VOLTAGE (T72) SENSOR SUPPLY VOLTAGE CIRCUIT SHORT TO OTHER CIRCUITS TRANSMISSION CONTROL MODULE Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - Diagnostic Test 1. CHECK FOR SPEED SENSOR DTCS With the scan tool, check for other transmission DTCs. Are there any speed sensor and/or temperature sensor DTCs present? Yes >> Refer to the Transmission category and perform the appropriate symptom(s). (Refer to 21 - TRANS- MISSION/TRANSAXLE/AUTOMATIC - NAG1 - DIAGNOSIS AND TESTING) No >> Go To 2 2. CHECK SOLENOID SUPPLY VOLTAGE ON THE SCAN TOOL Start the engine. With the scan tool, check the Transmission Solenoid Supply Voltage. Is the Transmission Solenoid Supply Voltage above 7.2 volts? Yes >> Go To 3 No >> Go To 5 3. CHECK (T72) SENSOR SUPPLY CIRCUIT VOLTAGE While back probing, measure the voltage of the (T72) Solenoid Supply Does the measured voltage match the voltage reading on the Yes >> Go To 4 No >> Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or CONTROL MODULES/TRANSMISSION CONTROL MODULE - DESCRIPTION) Perform NAG1 TRANSMISSION VERIFICATION TEST - 21 - 26 AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS LX |