Test D: Digital Transmission Range Sensor: Testing
NOTE:
DTC P1705 may be set if transmission is not in "P" or "N" position when QUICK TEST is performed.
- Verify Digital Transmission Range Sensor Alignment
Turn ignition switch to OFF position. Place selector lever in "P" position. Ensure Transmission Range (TR) sensor connector is fully seated, terminals are fully engaged in connector and in good condition. Repair as necessary. Apply parking brake. Place selector lever in "N" position. Disconnect shift cable/linkage from manual lever. Verify digital TR sensor alignment tool fits in appropriate slots. If TR sensor is correctly adjusted, go to next step. If sensor requires adjustment, adjust as necessary. See appropriate AUTOMATIC TRANSMISSION SERVICING article in TRANSMISSION SERVICING. After adjustment, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS & TESTING. Repeat QUICK TEST . - Check Electrical Signal Operation
Place selector lever in "P" position. Disconnect TR sensor harness connector. Inspect both ends of connector for damage or pushed out terminals, corrosion, loose wires and missing or damaged seals. If connector is okay and you are directed here to diagnose a DTC, go to next step. If diagnosing a starting problem, back-up lights condition or engagement condition, go to step 8. If connector needs repair, repair as necessary and clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS & TESTING. Repeat QUICK TEST . - Check Electrical System Operation (Digital TR Sensor & PCM)
Turn ignition switch to OFF position. Connect NGS tester to DLC. Reconnect TR sensor connector. Turn ignition switch to ON position. Select TR PIDs TR and TR_D on NGS tester. While moving selector lever to each position, wiggle TR sensor wiring harness connector and tap on TR sensor lightly, while observing NGS tester display. See Fig 1. If PID values do not change during wiggle or tap tests, go to next step. If PID values change during wiggle or tap tests, TR sensor is okay. Diagnose problem by symptom. See SYMPTOM DIAGNOSIS under TROUBLE SHOOTING. - Check Digital TR Sensor Operation
Disconnect TR sensor harness connector. Connect TR "E" cable and transmission tester to TR sensor. See Fig 2. Install TR Sensor overlay onto the tester. Perform TR sensor test as instructed on overlay. If TR "E" cable status lights match each selected gear position, TR sensor is okay. Go to next step. If TR "E" cable status lights do not match each selected gear position, replace and adjust TR sensor. See appropriate AUTOMATIC TRANSMISSION SERVICING article in TRANSMISSION SERVICING for adjustments. Clear DTCs. Repeat QUICK TEST under DIAGNOSIS & TESTING. - Check PCM Harness Circuits For Opens
Turn ignition switch to OFF position. Ensure TR sensor is disconnected. Disconnect PCM 104-pin harness connector, and inspect it for damaged terminals, corrosion and loose wires. Repair as necessary. Install breakout box, leaving PCM disconnected. Measure and record resistance between breakout box pin No. 2 and transmission harness connector terminal No. 8 (Gray/Red wire). On California models equipped with 7.3L diesel engine and all gasoline engines, measure and record resistance between breakout box pin No. 34 and TR sensor harness connector terminal No. 4 (Yellow/Black wire). On Federal models equipped with 7.3L diesel engines, measure and record resistance between breakout box pin No. 17 and TR sensor harness connector terminal No. 4 (Yellow/Black wire). On all models, measure and record resistance between breakout box pin No. 49 and TR sensor harness connector terminal No. 5 (Light Blue/Black wire). On all models, measure and record resistance between breakout box pin No. 50 and TR sensor harness connector terminal No. 6 (White/Black wire). On all models, measure and record resistance between breakout box pin No. 64 and TR sensor harness connector terminal No. 3 (Light Blue/Yellow wire). See Fig 3. If each resistance is less than 5 ohms, go to next step. If any resistance is 5 ohms or more, repair open circuit. Remove breakout box and connect all components. Erase all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS & TESTING. Repeat QUICK TEST . - Check PCM Circuits For Short To Power Or Ground
Ensure TR sensor harness connector is disconnected. Measure resistance between specified breakout box pins. See TR SENSOR/PCM CIRCUIT CHECK table. If each measurement is more than 10 k/ohms, go to next step. If any measurement is 10 k/ohms or less, repair short circuit(s). Remove breakout box and connect all components. Erase all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS & TESTING. Repeat QUICK TEST .TR SENSOR/PCM CIRCUIT CHECKApplication Measure Between BOB Pins No. Short To Power 71, 97 & 34, 49, 50, 64, 91 Short To Ground 34, 49, 50, 64 & 24, 51, 76, 77, 91, 103 - Check For Short Between TR/PCM Input Signal Wires
Measure and record resistance between breakout box pin No. 34 and breakout box pins No. 49, 50 and 64. Measure and record resistance between breakout box pin No. 49 and breakout box pins No. 34, 50, and 64. Measure and record resistance between breakout box pin No. 50 and breakout box pins No. 34, 49, and 64. Measure and record resistance between breakout box pin No. 64 and breakout box pins No. 34, 49, and 50. If each resistance is more than 10 k/ohms, replace PCM. Reconnect all connectors and clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS & TESTING. Repeat QUICK TEST . If any resistance is 10 k/ohms or less, repair short circuit(s). Reconnect all connectors, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES . Repeat QUICK TEST . - Check Non-PCM Internal TR Sensor Circuits
Connect TR "E" cable marked DIGITAL and transmission tester to TR sensor. See Fig 2. Install DIGITAL TR Sensor Overlay onto transmission tester. Perform switch test as instructed on DIGITAL TR sensor overlay. If transmission tester status light does not turn Red, replace and adjust TR sensor. If transmission tester status light turns Red, TR sensor is okay. For back-up lights concerns, see BACK-UP LIGHTS article in ACCESSORIES & EQUIPMENT. For 4WD Low condition, see TEST TG: 4WD LOW (4X4L) RANGE . For neutral-sense and starting concerns, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.