Pinpoint Test D - Transmission Range (Tr) Sensor

1) 4R44E & 4R55E Electronic Diagnostics Ensure TR sensor harness connector is fully seated and in acceptable condition. Repair as necessary. Ensure TR sensor is correctly adjusted. See AUTO TRANS OVERHAUL - FORD 4R44E & 4R55E article. After adjustment, place transmission in park and clear trouble codes. See CLEARING CODES. Repeat QUICK TEST. If sensor is correctly adjusted, go to next step.

2) Check Electrical Signal Operation Ensure ignition is off. Disconnect TR sensor connector, and inspect it for damaged pins, corrosion and loose wires. Repair as necessary. Turn ignition on. Measure voltage between harness connector terminals No. 6 and 7. See Fig 1. If voltage is 4.75-5.25 volts, go to step 5). If voltage is not within specification, go to next step.

Fig 1: Identifying TR Sensor Harness Connector

TR SENSOR WIRE COLOR IDENTIFICATION

Terminal No.	Wire Color
6	Light Blue/Yellow
7	Gray/Red

3) Check Continuity Of TR Sensor Harness Circuits Turn ignition 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, measure and record resistance between breakout box test pin terminal No. 30 and TR sensor harness connector terminal No. 7. Measure and record resistance between breakout box test pin terminal No. 46 and TR sensor harness connector terminal No. 6. See Fig 1. On all other models, measure and record resistance between breakout box test pin terminal No. 64 and TR sensor harness connector terminal No. 7. Measure and record resistance between breakout box test pin terminal No. 91 and TR sensor harness connector terminal No. 6. If each resistance is less than 5 ohms, go to next step. If any resistance is more than 5 ohms, repair open circuit. Remove breakout box and connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST.
4) Check TR Circuit For Shorts To Power & Ground On 1995 Explorer models, measure resistance between breakout box test pin No. 30 and test pins No. 37, 40, 46, 57 and 60. Measure resistance between breakout box test pin No. 30 and ground. On all other models, measure resistance between breakout box test pin No. 64 and test pins No. 71, 77, 91, 97 and 103. Measure resistance between breakout box test pin No. 64 and ground. If each resistance is more than 10 k/ohms, go to next step. If any resistance is less than 10 k/ohms, repair short circuit. Remove breakout box and connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST.
5) Check TR Sensor Resistance Install TR overlay on transmission tester. Connect tester to TR sensor. Ensure sensor functions in all positions. See tester instructions. Check continuity and resistances in all positions. See Fig 2. If TR sensor does not operate within specification, replace sensor. Connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST. If sensor operates within specification, replace PCM. Go to next step.

Fig 2: TR Resistance Specification Chart
6) Check TR Sensor Park/Neutral Circuit Check park/neutral circuit in all gear positions. See tester instructions. Connect ohmmeter between terminals No. 1 and 4. See Fig 1. Check resistances in all positions. Resistance should be less than 5 ohms in park/neutral and 100 k/ohms or more in all other positions. If TR sensor does not operate within specification, replace sensor. Connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST. If sensor operates within specification, go to next step.
7) Check TR Sensor Reverse/Backup Light Circuit Check reverse/backup light circuit in all gear positions. See tester instructions. Connect ohmmeter between terminals No. 2 and 3. See Fig 1. Check resistances in all positions. Resistance should be less than 5 ohms in reverse and 100 k/ohms or more in all other positions. If TR sensor does not operate within specification, replace sensor. Connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST. If sensor operates within specification, go to next step.
8) Check TR Sensor 4WD Low/Neutral Sense Circuit Check 4WD low/neutral sense circuit in all gear positions. See tester instructions. Connect ohmmeter between terminals No. 5 and 8. See Fig 1. Check resistances in all positions. Resistance should be less than 5 ohms in neutral and 100 k/ohms or more in all other positions. If TR sensor does not operate within specification, replace sensor. Connect all components. Erase all trouble codes. See CLEARING CODES. Repeat QUICK TEST. If sensor operates within specification, see TROUBLE SHOOTING in AUTO TRANS OVERHAUL - FORD 4R44E & 4R55E article for non-electronic symptom diagnostics.