Test F: Turbine Shaft Speed (TSS) Sensor

Preliminary Inspection Inspect condition of TSS harness and component connector. Repair as needed. Go to next step.
Check Continuity Of TSS Harness Circuit Ensure ignition is off. Disconnect PCM 104-pin connector, and inspect it for damaged pins, corrosion and loose wires. Repair as necessary. Install breakout box, leaving PCM disconnected. Disconnect TSS harness connector. On Continental, measure and record resistance between breakout box test pin No. 59 and TSS harness connector positive terminal. On Sable and Taurus, measure and record resistance between breakout box test pin No. 84 and TSS harness connector positive terminal. On all models, measure and record resistance between breakout box test pin No. 91 and TSS harness connector SIG RTN terminal. If resistances measured are 5 ohms or less, go to next step. If resistances measured are more than 5 ohms, repair open circuit(s). Connect all components. Erase all DTCs. See CLEARING CODES . Repeat QUICK TEST .
Check TSS Circuit For Short To Power & Ground On Continental, measure and record resistance between breakout box test pins No. 59 and 91, and test pins No. 71 and 97. Measure and record resistance between test pins No. 59, 71, 91 and 97, and test pins No. 24, 51, 76, 77 and 103. On Sable and Taurus, measure and record resistance between breakout box test pins No. 84 and 91, and test pins No. 71 and 97. Measure and record resistance between test pins No. 71, 84, 91 and 97, and test pins No. 24, 51, 76, 77 and 103. If any resistance measured is less than 10 k/ohms, repair short circuit. Connect all components. Disconnect breakout box and repeat QUICK TEST . If resistance is 10 k/ohms or more, go to next step.
TSS Functional Test Ensure TSS harness connector is disconnected. Connect transmission tester to TSS component connector. Connect voltmeter leads to appropriate tester TSS jacks. Set voltmeter to 20-volt AC scale. Perform drive cycle test. See TRANSMISSION DRIVE CYCLE TEST . If voltage increases with vehicle speed, replace PCM. Connect all components. Erase all DTCs. See CLEARING CODES . Repeat QUICK TEST . If voltage does not increase with speed, go to next step.
Check Resistance Of TSS Connect ohmmeter leads to appropriate Transmission Tester TSS jacks. If resistance is 100-200 ohms, go to next step. If resistance is not within specification, replace TSS. Connect all components. Erase all DTCs. See CLEARING CODES . Perform drive cycle test. See TRANSMISSION DRIVE CYCLE TEST . Repeat QUICK TEST .
Check TSS For Short To Ground Check for continuity between transmission tester TSS jacks and tester BAT(-) jack. If continuity exists, go to next step. If continuity does not exist, replace TSS. Connect all components. Erase all DTCs. See CLEARING CODES . Perform drive cycle test. See TRANSMISSION DRIVE CYCLE TEST . Repeat QUICK TEST .
Check TSS Magnetism Remove TSS from transaxle. See FORD AX4N overhaul article. Determine if TSS magnetically attracted to ferrous metal. If TSS acts like a magnet, go to next step. If TSS does not stick to ferrous metal surface, replace TSS. Connect all components. Erase all DTCs. See CLEARING CODES . Perform drive cycle test. See TRANSMISSION DRIVE CYCLE TEST . Repeat QUICK TEST .
Check Exciter Wheel With TSS removed, inspect condition of exciter wheel. Rotate engine with remote starter switch and ensure all 4 teeth of exciter wheel are not damaged. Measure depth of each tooth. Tooth depth should be .73-.80" (18.65-20.34 mm). Replace exciter wheel if any teeth are damaged or tooth depth is not within specification. See FORD AX4N overhaul article. Erase all DTCs. See CLEARING CODES . Perform drive cycle test. See TRANSMISSION DRIVE CYCLE TEST . Repeat QUICK TEST . If exciter wheel is not damaged and tooth depth is within specification, replace TSS. Connect all components. Erase all DTCs. See CLEARING CODES. Perform drive cycle test. See TRANSMISSION DRIVE CYCLE TEST . Repeat QUICK TEST.