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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Automatic Transmission - Diagnosis - Ax4S) >> System Tests >> Test G: Output Shaft Speed Sensor

Test G: Output Shaft Speed Sensor

WARNING: This page is about a different variant/trim than selected.

  1. Electronic Diagnosis

    Ensure OSS sensor harness and component connector terminals are in good condition. If connector and terminals are not okay, repair as necessary. If connector is okay, go to next step.
  2. Check Continuity Of OSS Sensor Harness Circuit

    Turn ignition switch to OFF position. Disconnect PCM 104-pin connector, and inspect it for damaged terminals, corrosion and loose wires. Repair as necessary. Install breakout box, leaving PCM disconnected. Disconnect OSS sensor harness connector. Measure and record resistance between breakout box test pins No. 6 (Sable and Taurus), 84 (Windstar) and OSS sensor harness connector positive terminal (Dark Blue/Yellow wire). Measure and record resistance between breakout box test pin No. 91 and OSS sensor harness connector negative terminal (Gray/Red wire). If resistance readings are less than 5 ohms, go to next step. If resistance readings are 5 ohms or more, repair open circuits. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING.
  3. Check OSS Sensor Circuit For Short To Power & Ground

    Measure and record resistance between breakout box test pins No. 6 (Sable and Taurus), 84 (Windstar), 91, and test pin No. 71. Measure and record resistance between breakout box test pins No. 6 (Sable and Taurus), 84 (Windstar), 91 and test pins No. 24, 51, 76, 77 and 103. If all resistance readings are more than 10 k/ohms, go to next step. If any resistance reading is 10 k/ohms or less, repair short circuit. Connect all components. Disconnect breakout box and repeat QUICK TEST  under DIAGNOSIS & TESTING.
  4. OSS Sensor Functional Test

    Reconnect PCM connector. Ensure OSS sensor connector is disconnected. Connect transmission tester to OSS sensor component connector. Connect voltmeter leads to appropriate tester OSS sensor jacks. Perform TRANSAXLE DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. If voltage increases when vehicle speed increases, replace PCM. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING. If voltage does not increase when vehicle speed increases, go to next step.
  5. Check Resistance Of OSS Sensor

    Measure resistance between both transmission tester OSS sensor jacks. If resistance is 235-735 ohms, go to next step. If resistance is not 235-735 ohms, replace OSS sensor. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Perform TRANSAXLE DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING.
  6. Check OSS Sensor For Short To Ground

    Check for continuity between BAT (-) jack and each OSS sensor jack on transmission tester. If continuity does not exist, go to next step. If continuity exists, replace OSS sensor. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Perform TRANSAXLE DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING.
  7. Check OSS Sensor Magnetism

    Remove OSS from transaxle. See FORD AX4S OVERHAUL article. Determine if OSS sensor is magnetically attracted to a ferrous metal surface. If OSS sensor sticks to ferrous metal surface, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING. Perform TRANSAXLE DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. If OSS sensor does not stick to ferrous metal surface, replace OSS sensor. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  . Perform TRANSAXLE DRIVE CYCLE TEST  . Repeat QUICK TEST  .