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Test E: Output Shaft Speed Sensor

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 Mercury Grand Marquis, 2002 Lincoln Town Car, 2002 Ford Crown Victoria, 2001 Mercury Mountaineer, and 2001 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat RETRIEVING DIAGNOSTIC TROUBLE CODES (QUICK TEST)  under SELF-DIAGNOSTIC SYSTEM. Ensure all EEC-V systems are working properly and DTCs are no longer present.
  1. Ensure transmission wiring harness connector is fully seated, and terminals are fully engaged in connector and in good condition. Repair as necessary. Install scan tool. Turn ignition switch to ON position. Follow on-screen instructions to PID/DATA MONITOR AND RECORD. Select OSS sensor PID. If vehicle enters PID mode, remain in PID mode and go to next step. If vehicle does not enter PID mode, repeat procedure. If vehicle is still unable to enter PID mode, diagnose communication problem. See SCAN TOOL UNABLE TO COMMUNICATE  under SELF-DIAGNOSTIC SYSTEM.
  2. While monitoring OSS sensor PID, drive vehicle so transmission shifts up and down through all gears. If OSS sensor PID signal is steady but does not increase or decrease with engine RPM, go to next step. If OSS sensor PID increases and decreases with engine RPM and does not operate erratically, erase all trouble codes. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Repeat QUICK TEST. See RETRIEVING DIAGNOSTIC TROUBLE CODES (QUICK TEST)  under SELF-DIAGNOSTIC SYSTEM, and see SYMPTOM DIAGNOSIS (ELECTRONIC)  or SYMPTOM DIAGNOSIS (MECHANICAL)  under TROUBLE SHOOTING. If OSS sensor PID signal is erratic only, check wiring and connectors for intermittent poor connection. If OSS sensor PID does not increase or decrease with engine RPM and/or operates erratically (decreases to zero or near zero and returns to normal), inspect wiring harness and connectors for short or open circuit.
  3. Disconnect OSS sensor connector. Using DVOM, measure resistance between OSS sensor terminals. Resistance should be 1026-1194 ohms for Crown Victoria and Econoline, 450-750 ohms for Town Car, and 344-759 ohms for all other models. If resistance is not as specified, replace OSS sensor. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. If resistance is as specified, diagnose by symptom. See SYMPTOM DIAGNOSIS (ELECTRONIC)  or SYMPTOM DIAGNOSIS (MECHANICAL)  under TROUBLE SHOOTING.
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