Transmission Range (TR) Sensor Testing

INTRODUCTION
The transmission tester with DTR adapters operates the electrical portion of the Digital Transmission Range (DTR) sensor. The DTR sensor tester usage is divided into five steps:
1. Preliminary Testing and Diagnosis.
2. Transmission Tester installation (Set-Up Procedure).
3. Testing DTR Sensor.
4. Voltage Tests-Park/Neutral Backup Lamp and Optional Circuits.
5. Disconnecting the Tester.

PRELIMINARY TESTING AND DIAGNOSIS
Before any diagnostic testing is done on a vehicle, some preliminary checks must be performed, as listed below. Be sure to write down your findings, especially any DTCs found, for future reference.
- Check the transmission fluid level and condition.
- Check for add-on items (phones, computers, CB radio etc).
- Visually inspect the wiring harness and connectors.
- Check for vehicle modifications.
- Verify that the shift linkage is properly adjusted in OVERDRIVE.
- Verify that the Transmission Range (TR) sensor is properly adjusted in NEUTRAL.
- Verify the customer concern:
> upshift
> downshift
> coasting
> engagement
> noise/vibration.
- Vehicle must be at a normal operating temperature.
- Perform vehicle On-Board Diagnostics. Record all DTCs.
- Repair all non-transmission DTCs.

INSTALLATION PROCEDURES
Installing the Transmission Tester at the DTR Sensor connector separates the vehicle electronics from the DTR sensor electronics. During tester usage additional DTCs may be set. Therefore, it is important that all codes are erased after repairs have been made. To verify elimination of all DTCs, rerun On-Board Diagnostic.

1. For proper DTR or TR sensor diagnosis, follow Pinpoint Test D.
2. Disconnect vehicle harness at DTR sensor connector.

CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in a transmission concern.








3. Set BENCH/DRIVE switch to DRIVE mode. Install DTR Sensor Overlay onto the tester.

CAUTION: Route all cables away from heat sources.

4. Connect the interface cable to transmission tester and to the DTR sensor connector. When using Cable "E," set Analog/Digital Switch to Digital. For the TR sensor use cable C. For the DTR sensor use cable E.
5. Turn the test select switch to the TR SENSOR TEST position.
6. Plug the transmission tester power supply plug into the cigar lighter.
At this time, all LEDs should illuminate for a short period and then turn off. This is the tester internal circuit check.

Digital Transmission Range (DTR) Sensor Connector:

Transmission Range (TR) Sensor Connector:

SENSOR TEST

CAUTION: Make sure the DIGITAL 12-pin sensor cable connector (BLACK) is used. If the wrong connection is made or the slide switch is in the wrong position, the LEDs on the TR cable will give false or no response during testing resulting in the replacement of good parts.

1. Place transmission range selector lever into PARK.
2. Make sure that the E cable ANALOG/DIGITAL switch is set to DIGITAL.
3. Move the transmission range selector lever through all ranges.
4. Monitor the LEDs, located on the E cable, in each gear position. The LED should illuminate RED for the appropriate range selected.
5. If the LED for the applicable gear range position fails to illuminate RED or if it lights for a position other than the gear selected perform the following:
- Verify test cable connections at sensor and tester.
- Verify transmission shift linkage for proper adjustment.
- Verify TR sensor for proper adjustment.
- Retest.

6. If the sensor still fails to illuminate the LED RED for the selected gear range or indicates incorrect gear position, replace it.

DISCONNECTING THE TESTER
1. Disconnect the transmission tester from the Digital Transmission Range (DTR) sensor connector.

CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in a transmission concern.

2. Reinstall the vehicle wiring harness. Verify the connection by pulling up on the harness.
3. Disconnect the transmission tester power lead from vehicle.
4. Erase all DTCs.
5. Rerun the on-board diagnostic tests to receive a pass code.
6. Verify that the customer concern has been eliminated.