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P0643-SENSOR REFERENCE VOLTAGE 1 CIRCUIT HIGH (CONTINUED) 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 for the appropriate service proce- Perform NAG1 TRANSMISSION VERIFICATION TEST - 4. (T72) SENSOR SUPPLY VOLTAGE CIRCUIT SHORT TO ANOTHER CIRCUIT Turn the ignition off to the lock position. Disconnect the Transmission Electrohydraulic Control Unit Assembly Disconnect all TCM harness connectors. Measure the resistance between the (T72) Solenoid Supply Voltage Is the resistance below 5.0 ohms between the (T72) Solenoid Yes >> Repair the (T72) Solenoid Supply Voltage circuit for a short to another circuit(s). Perform NAG1 TRANSMISSION VERIFICATION TEST - No >> Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or CONTROL MODULES/TRANSMISSION CONTROL MODULE for the appropriate service proce- Perform NAG1 TRANSMISSION VERIFICATION TEST - 21 - 482 AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS WK |