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1997 Ford Taurus V6-3.0L VIN U
Copyright © 2005, ALLDATA
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Transmission Position Switch/Sensor: Testing and Inspection
With AX4N Transmission
Rotunda TR/MLP Sensor Tester Overlay
INTRODUCTION
CAUTION: Do not attempt to pry off transmission harness connector with a screwdriver. This will damage the connector and could result
in a transmission concern.
The transmission tester allows a technician to operate the electrical portion of the Transmission Range (TR) sensor. The TR/MLP tester
usage is divided into six steps:
1. Preliminary testing and diagnosis.
2. Transmission tester installation (Set-Up Procedure).
3. Testing TR sensor.
4. Park/Neutral, backup lamp and optional circuit voltage tests.
5. Testing TR sensor range indicator circuit for instrument cluster.
6. Transmission tester removal and clearing diagnostic trouble codes (DTCs).
NOTE: Installing the transmission tester at the transaxle harness connector allows the separation of the TR sensor electronics from the
vehicle electronics.
CAUTION: Testing may cause additional diagnostic trouble codes (DTC's) 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 TR sensor is properly adjusted in NEUTRAL.
3. Verify customer concern (when does it occur?):
a. upshift
b. downshift
c. coasting
1997 Ford Taurus V6-3.0L VIN U
5.
6.
7.
8.
9.
10.
11.
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d. engagement
4. If concern involves noise or vibration, does it relate to any of the following:
a. rpm
b. vehicle speed
c. shift
d. gear
e. range
f. temperature
Vehicle must be at normal operating temperature.
Check transmission fluid level and condition.
Check for the following items:
a. vehicle modifications
b. electronic add-on items
c. leaks
d. proper linkage adjustments
Check TSB's for related information.
Perform complete On-Board Diagnostics (OBD) for both KOEO and KOER.
Record all DTCs.
Repair all non-transaxle DTCs.
INSTALLATION PROCEDURES
NOTE:
^ Installing the Transmission Tester at the TR sensor CONNECTOR allows the separation of the vehicle electronics from the TR sensor
electronics.
^ During tester usage additional DTCs may be set. Therefore, it is important that all codes are erased after service has been made. To verify
elimination of all DTCs, rerun On-Board Diagnostic.
^ The electrical and vacuum diagrams should be referenced to assist in diagnosis of electronically-controlled transmissions:
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.
NOTE: 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.
Interface Cable Applications
1997 Ford Taurus V6-3.0L VIN U
Copyright © 2005, ALLDATA
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Transmission Range (TR) Sensor Interface Cable B
Transmission Range (TR) Sensor Interface Cable E
4. Select and connect the appropriate interface cable to Tester and then to TR connector.
NOTE: 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's
internal circuit check. 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.
CAUTION: For resistance checks be sure that the LARGE DIAL is set to TR/MLP SENSOR TEST or damage to the ohmmeter could
result.
RESISTANCE/CONTINUITY TESTS
1. Set ohmmeter to 20K ohms.
2. Connect ohmmeter COM jack to SIG RTN jack.
3. Connect ohmmeter POS lead to TR jack. LED turns OFF when circuit is open.
4. Record resistance in every gear position while moving the shift lever to each position.
5. Refer to the TR Sensor Resistance Ranges Chart.
6. If values are out of range, GO to Pinpoint Test D. See: Transmission Control Systems/Testing and Inspection/Testing and Inspection
Procedures/AX4N/Trouble Code Diagnostic Charts - Pinpoint Tests/D: Transmission Range (TR) Sensor
TR Sensor Resistance Ranges Chart
Gearshift Lever Position ....................................................................................................................................................... Resistance (Ohms)
PARK ...................................................................................................................................................................................... 3770 to 4607
REVERSE ............................................................................................................................................................................... 1304 to 1593
NEUTRAL .................................................................................................................................................................................. 660 to 807
OVERDRIVE ............................................................................................................................................................................. 361 to 442
SECOND/DRIVE* ..................................................................................................................................................................... 190 to 232
FIRST ............................................................................................................................................................................................. 78 to 95
1997 Ford Taurus V6-3.0L VIN U
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* Same values for SECOND (electronic transaxle with separate positions for DRIVE and OVERDRIVE).
VOLTAGE TESTS - PARK/NEUTRAL, BACKUP LAMP AND OPTIONAL CIRCUITS
NOTE:
^ LED turns OFF when circuit is open.
^ LED lights RED when circuit is closed.
1. Press and hold each test button while moving the shift lever to each gear position.
2. Monitor each STATUS LED:
a. The LED in the appropriate gear position you are retesting should light red.
b. If the LED for the applicable gear position fails to light red, or if it lights for a position other than the gear selected:
1. Verify shift linkage adjustment with the shifter in the overdrive position.
2. Verify TR sensor alignment in the neutral position.
3. Retest.
3. If the sensor fails, replace it.
4. If sensor is OK, perform diagnosis of starter, backup lamps and optional circuits.
5. After you finish testing, continue to Disconnecting the Tester.
TR SENSOR RANGE CIRCUITS (ILLUMINATED INSTRUMENT PANEL ONLY)
1. Using cable E, perform the following test steps for diagnosis of the transmission range selection instrument panel circuits.
CAUTION: Be sure that the correct 12-pin sensor connector is connected to the proper sensor. Make sure the correct TR-E cable connector
is used (ANALOG or DIGITAL). If the wrong connection is made or the slide switch is in the wrong position, the LEDs on the TR position
cable will give a false or no response during testing. This will cause the replacement of good parts.
2. Place vehicle transaxle range selector lever into PARK.
3. Move transaxle range selector lever through all ranges.
4. Monitor the instrument panel status lights located in the TR sensor E cable. 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 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.
7. If sensor is OK, perform diagnosis of instrument panel and vehicle harness.
DISCONNECTING THE TESTER
1. Disconnect transmission tester from transaxle connector.
CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in a transaxle
concern.
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.
1997 Ford Taurus V6-3.0L VIN U
Copyright © 2005, ALLDATA
5. Erase all DTC's.
6. Rerun On-Board Diagnostics (OBD) to receive a pass code.
7. Verify that the customer concern has been eliminated.
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