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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - Diagnosis - 4R44E & 4R55E Automatic Transmission >> EEC-IV & EEC-V Pinpoint Tests >> Pinpoint Test F - Transmission Speed Sensor (TSS)

Pinpoint Test F - Transmission Speed Sensor (TSS)

  1. 1) 4R44E & 4R55E Electronic Diagnostics  Ensure transmission harness connector is in acceptable condition. Repair as necessary. Go to next step.
  2. 2) Check Continuity Of TSS Harness Circuit  Ensure ignition is off. Disconnect PCM connector, and inspect it for damaged pins, corrosion and loose wires. Repair as necessary. Install breakout box, leaving PCM disconnected. On 1995 Explorer models, disconnect TSS harness connector. Measure and record resistance between breakout box test pin No. 5 and TSS (+) terminal. Measure and record resistance between breakout box test pin No. 46 and TSS (-) terminal. On all other models, measure and record resistance between breakout box test pin No. 84 and transmission harness connector terminal No. 2. See Figure. Measure and record resistance between breakout box test pin No. 91 and transmission harness connector terminal No 3. If each resistance is 5 ohms or less, go to next step. If any resistance is more than 5 ohms, repair open circuit. Connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST.
  3. 3) Check TSS Circuit For Short To Power & Ground  On 1995 Explorer models, measure and record resistance between test pins No. 5 and 46, and test pins No. 37 and 57. Measure and record resistance between test pins No. 5, 37, 46, and 57, and test pins No. 40 and 60. On all other models, measure and record resistance between 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. 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 each resistance is 10 k/ohms or more, go to next step.
  4. 4) TSS Functional Test  Connect PCM connector. Connect transmission tester. Connect voltmeter leads to appropriate tester jacks. Set voltmeter to 20 volt AC scale. Perform drive cycle test. See TRANSMISSION DRIVE CYCLE TESTS. If voltage increases with vehicle speed, replace PCM. Connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST. If voltage does not increase with speed, go to next step.
  5. 5) Check Solenoid/Harness Resistance  Set Gear Selector switch to OFF. Connect ohmmeter leads to appropriate tester jacks. If resistance is 64-120 ohms, connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST. See TROUBLE SHOOTING in AUTO TRANS OVERHAUL - FORD 4R44E & 4R55E article for non-electronic symptom diagnostics. If resistance is not within specification, go to next step.
  6. 6) Check Solenoid/Harness For Short To Ground  Check for continuity between each TSS jack and tester BAT (-) jack. If continuity does not exist, connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST. See TROUBLE SHOOTING in AUTO TRANS OVERHAUL - FORD 4R44E & 4R55E article for non-electronic symptom diagnostics. If continuity exists, replace TSS. See TRANSMISSION DISASSEMBLY in AUTO TRANS OVERHAUL - FORD 4R44E & 4R55E article.
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