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Home >> Mercury >> 1999 >> Sable V6-3.0L DOHC VIN S >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> AX4S >> Digital Transmission Range (TR) Sensor Testing

Digital Transmission Range (TR) Sensor Testing





Introduction

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

The transmission tester allows you to test the digital TR sensor independent of the vehicle electronics. Digital TR sensor testing is divided into five steps:
1. Preliminary testing and diagnosis.
2. Transmission tester installation (set-up procedure).
3. Testing TR sensor.
4. Voltage Test-Park/Neutral, Backup Lamp and Optional Circuits.
5. Transmission Tester Removal and Clearing DTCs.

Installing the Transmission Tester at the transaxle harness connector allows the separation of the digital TR sensor electronics from the vehicle electronics.

Testing may cause additional Diagnostic Trouble Codes (DTCs) to be set. Therefore, it is important that you erase all DTCs whenever you make repairs. To verify elimination of all DTCs, rerun On-Board Diagnostics.

Preliminary Testing and Diagnosis
Before you start testing, perform the following preliminary checks. Be sure to write down your findings, especially any DTCs, for future reference.
1. Know and understand the customer's concern.
2. Verify that digital TR sensor is properly adjusted in NEUTRAL.
3. Verify customer concern (when does it occur?):
- upshift
- downshift
- coasting
- engagement

If concern involves noise or vibration, does it relate to any of the following:
- rpm
- vehicle speed
- shift
- gear
- range
- temperature
4. Vehicle must be at normal operating temperature.
5. Check transmission fluid level and condition.
6. Check for the following items:
- vehicle modifications
- electronic add-on items
- leaks
- proper linkage adjustments
7. Check TSBs for related information.
8. Perform complete On-Board Diagnostics (OBD) for both KOEO and KOER.
9. Record all DTCs.
10. Repair all non-transaxle DTCs.

Digital Transmission Range (TR) Sensor Testing





1. Attach the Digital TR Sensor Overlay 007-00131 to the transmission tester.
Affixing the overlay will immobilize the two-way switch (set in Step 2) so it cannot be accidentally moved to an incorrect setting during testing.





2. Select and connect interface cable "E" 418-F107 to the tester and then black connector (digital) to TR sensor.





3. CAUTION: Route all cables away from heat sources to prevent damage to cables during testing.

Set analog/digital switch on TR-E cable to digital.
Use the transmission tester extender cable when running tests with the transmission on the vehicle.
4. Turn large dial to DIGITAL TR SENSOR TEST.





5. Plug transmission tester power cable into cigar lighter socket.
All LEDs should light for a short period and then turn off. This is the Tester's internal circuit check.

CAUTION: For resistance checks, be sure that the tester selector switch is set to the TR SENSOR TEST position or damage to the ohmmeter may result.

Sensor Test

CAUTION: Be sure that 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. This will cause the replacement of good parts.

1. Place transmission range selector lever into PARK.
2. Ensure 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:
a. Verify test cable connections at sensor and tester.
b. Verify transmission shift linkage for proper adjustment.
c. Verify digital TR sensor for proper adjustment.
d. Retest.
6. If the sensor still fails to illuminate the LED RED for the selected gear range or indicates incorrect gear position, replace it.

Switch Tests-Park/Neutral, Backup Lamp and Optional Circuits





NOTE: LED lights red when circuit is closed. LED turns off when circuit is open.

1. Press and hold each test button while moving the transmission range selector lever to each gear position.
2. Monitor each STATUS LED:
The LED in the appropriate gear position being tested should light red.
If the LED for the applicable gear position fails to light red, or if it lights for a position other than the gear selected:
a. Verify digital TR alignment.
b. Retest.
3. If the digital TR sensor fails, replace it.
After testing is finished, follow the Disconnecting the Tester procedure.

Disconnecting the Tester

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

Disconnect transmission tester from transaxle connector.
2. Reinstall vehicle wiring harness. Verify connection by pulling up on the harness.
3. Reinstall all heat shields that were previously removed.
4. Disconnect Transmission Tester Power Cable from vehicle.
5. Erase all DTCs using procedures described in the Powertrain Management.
6. Rerun On-Board Diagnostics (OBD) to receive a pass code.
7. Verify that the customer concern has been eliminated.
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