Testing the TR Switch and the Park/Neutral and Backup Circuits

NOTE: The transaxle tester allows the technician to operate the electrical portion of the TR switch.

INSTALLING THE TRANSAXLE TESTER (SET UP PROCEDURES)
Installing the transaxle tester at the TR switch connector allows the separation of the vehicle electronics from the TR switch electronics.

NOTE: During tester usage, additional DTCs may be set. Therefore, it is important that all DTCs are erased after repairs have been made. To verify the elimination of all DTCs, rerun the On-Board Diagnostic Test.

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 the emission harness at transaxle TR switch connector.




CAUTION: Route all cables away from heat sources.

2. Set the Bench/Drive switch to "DRIVE" mode. Install the SST onto the tester. Connect the interface cable (cable I.D. "D") to the transaxle tester and then to the TR switch connector.




3. Turn the test select switch to the "MLP SENSOR TEST" position.




4. Plug the transaxle tester power supply plug into the cigarette lighter receptacle.
At this time, all LED's should illuminate for a short period and then turn off. This is the tester internal circuit check.


TESTING THE TR SWITCH
Static testing procedures allow for shop testing of the transaxle in the vehicle or on the bench. Completion of these tests prove out the TR switch electronically.

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

Resistance/Continuity Tests
- Using a digital volt-ohmmeter and the transaxle tester, perform the pinpoint test DTC P1705.
P1705

- Perform repairs as indicated by the pinpoint test. Always retest and road test the vehicle after a repair.

TR Switch Resistance Tests
- Set the ohmmeter to the 1,000 ohm range.
- Connect the positive lead of the ohmmeter to the MLP jack.
- Connect the negative lead of the ohmmeter to the SIGRTN jack.
- Move the selector lever into each range position.
- Record the resistance at each position.




- Refer to the chart for values.
- If out of range, refer to DTC P0712
P0712


PARK/NEUTRAL BACKUP LIGHT AND OPTIONAL CIRCUIT VOLTAGE TESTS

NOTE: LED will turn "RED" when the circuit is closed and turn "OFF" when the circuit is open.




1. Set the tester select switch to the "MLP SENSOR TEST" position.




2. Press and hold each button while moving the selector lever through each range position.
3. Monitor each "LED".
4. The status "LED" should indicate "RED" only in the indicated position. Refer to the overlay.
5. If the LED does not indicate "RED" in the desired position, or indicated RED" in another position, first verify the TR switch alignment and then retest. If the switch fails, replace it.


REMOVING THE TRANSAXLE 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 the transaxle tester from the TR switch connector.
2. Reinstall the emission harness. Verity the connection by pulling up on the harness.




3. Disconnect the transaxle tester power lead from vehicle.
4. Erase all DTCs by using the procedure:
Clearing Trouble Codes

(Unlatch the center button of the star tester while the codes are being displayed on a KOEO on-board diagnostic test)
5. Return to the on-board diagnostic test.
6. Verity that the customer concern has been eliminated.