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Home >> Mercury >> 1998 >> Mystique L4-122 2.0L DOHC VIN 3 SFI >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Digital Transmission Range (TR) Sensor Testing

Digital Transmission Range (TR) Sensor Testing






INTRODUCTION
The Transmission Tester allows testing of the Transmission Range (TR) sensor independent of the vehicle electronics. TR sensor testing is divided into five steps:
1. Preliminary testing and diagnosis.
2. Installing the Transmission Tester.
3. Testing the TR sensor.
4. Testing the park/neutral and backup circuits.
5. Removing the Transmission Tester and clearing Diagnostic Trouble Codes (DTCs).
Installing the Transmission Tester at the transaxle harness connector allows the separation of the TR sensor electronics from the vehicle electronics.
Testing may cause additional diagnostic trouble codes (DTCs) to be set. Therefore, it is important that all DTCs are erased whenever repairs are made. To verify elimination of all DTCs, rerun On-Board Diagnostics.

PRELIMINARY TESTING AND DIAGNOSIS
Before starting testing, perform the following preliminary checks. Be sure to write down any findings, especially any DTCs, for future reference.
1. Know and understand the customer concern.
2. Verify that Transmission Range (TR) sensor is properly adjusted in Neutral.
3. Verify customer concern (e.g., when does concern occur?)
- Upshift
- Downshift
- Coasting
- Engagement
4. If concern involves noise or vibration, verify if it relates to any of the following:
- rpm
- Vehicle speed
- Shift
- Gear
- Range
- Temperature
5. Vehicle must be at normal operating temperature.
6. Check transmission fluid level and condition.
7. Check for the following items:
- Vehicle modifications
- Electronic add-on items
- Leaks
- Proper linkage adjustments
8. Check TSBs for related information.
9. Perform complete On-Board Diagnostics (OBD) for both KOEO and KOER.
10. Record all DTCs.
11. Repair all non-transaxle DTCs.

INSTALLATION PROCEDURES

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

NOTE: During tester usage, additional fault codes may be set. Therefore, it is important that all codes are erased after repairs have been made. To verify elimination of all DTCs, rerun OBD tests.

1. Disconnect vehicle harness at transaxle TR sensor.
2. Set the two-way switch in the down position. (This switch will stay in the same position for all TR sensor testing.)
3. Attach the TR/MLP sensor overlay to the Transmission Tester. Affixing the overlay will immobilize the two-way switch (set in previous step) so it cannot be accidentally moved to an incorrect setting during testing.





4. Select and connect interface cable D to tester and then to Transmission Range (TR) sensor connector. Use the transmission tester extender cable when running tests with the transaxle on the vehicle.

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





5. Turn large dial to TR/MLP SENSOR TEST.





6. 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 internal circuit check.

CAUTION: For resistance checks be sure that the large dial is set to TR/MLP SENSOR TEST or damage to the ohmmeter could result.

Static testing procedures allow for shop testing of the TR sensor on the vehicle or on the bench. Completion of these tests prove out the TR sensor electronically.

RESISTANCE/CONTINUITY TESTS
1. Use a digital volt-ohmmeter and the Transmission Tester to perform Pinpoint Test D as outlined based on the DTC displayed.
2. Perform repairs as indicated by the pinpoint test. Always erase all codes, retest and road test vehicle after a repair.
3. Set ohmmeter to 5000 ohms.
4. Connect ohmmeter COM jack to SIG RTN jack.
5. Connect ohmmeter POS lead to TR jack. LED turns off when circuit is open.
6. Record resistance in every gear position while moving the shift lever to each position.





7. Refer to TR Sensor Resistance Ranges table.
8. If values are out of range, refer to the procedure.

VOLTAGE TESTS-PARK/NEUTRAL, BACKUP LAMP AND OPTIONAL CIRCUITS





1. Press and hold each test button while moving the transaxle range selector lever to each gear position.

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

2. Monitor each status LED: The LED in the appropriate gear position being retested 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:
- Verify TR alignment.
- Retest.
3. If the sensor fails, replace it. After testing is finished, continue to Disconnecting the Tester.

DISCONNECTING THE TESTER

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

1. 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.
6. Rerun On-Board Diagnostics (OBD) to receive a pass code (P1111).
7. Verify that the customer concern has been eliminated.
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