Transmission Position Sensor/Switch: Testing and Inspection

Checking Transmission Range Switch, Steps 1 & 3:

1 Connect an ISAT scan tool, contact the AFM system and enter command code EE6i.

The status of the system is displayed on the ISAT:


^ Selector lever in position D, R, 1, 2 or 3@PAE61-ON. If not, go to point 2.

^ Selector lever in position N or P@PAE61-OFF. If not, go to point 6.


2 Check fuse FA9.

3 With the ignition switched off, connect the break-out box to the ECM wiring harness (ECM disconnected).


Turn the ignition switch to the Drive position and check whether voltage is present on pin 14 of the ECM (selector lever in position D, R, 1, 2 or 3).


If it is, the ECM may be faulty. Review "Before Replacing ECM."

If it is not, continue as described below.

Checking Transmission Range Switch, Steps 4 Through 7:

4 Check whether voltage is present on pin 3 of the transmission range switch (selector lever switch) and also on pin 4 when the switch is activated.

If voltage is present on pin 3 but not on pin 4, replace the switch.


If no voltage is present on pin 3, check the lead from pin 3 to fuse FA9 for continuity.

5 If the switch and lead above are OK, switch off the ignition and use the break-out box to check the lead to pin 14 of the ECM for continuity/shorting.

Take remedial action if the wiring and/or connectors are faulty.

6 Check whether pin 4 of the transmission range switch is live when the switch is not activated (selector lever in position N or P). If it is, replace the transmission range switch.

7 If the switch is OK, turn off the ignition and connect the break-out box to the ECM wiring harness (ECM disconnected).

Turn the ignition switch to the Drive position and check the lead to pin 14 of the ECM for shorting to battery positive voltage.

Take remedial action in regard to faulty wiring/connectors/components causing the short circuit.

8 If the wiring is OK, the ECM may be faulty. Review "Before Replacing ECM."