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P0720-OUTPUT SPEED SENSOR CIRCUIT (CONTINUED) Diagnostic Test 1. CHECK TO SEE IF DTC P0720 IS CURRENT Turn the ignition off to the lock position. CAUTION: Properly support the vehicle and raise all drive wheels off the ground. Start the engine in park. Place the transmission gear selector in drive, release foot from brake. WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS. Is the Output Speed Sensor RPM below 100 RPM? Yes >> Go To 2 No >> Go To 9 2. OUTPUT SPEED SENSOR Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the NOTE: Check connectors - Clean/repair as necessary. With the Transmission Simulator, set the selector switch to 3000/1000 and the Input/Output switch to ON. With the scan tool, monitor the Input and Output Speed Sensor RPM Does the Input Speed read 3000 RPM and the Output Speed read 1000 RPM, ± 50 RPM? Yes >> Replace the Output Speed Sensor per the Service Information. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. No >> Go To 3 HB AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS 21 - 393 |