Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Mazda 6 L4-2.3LFACTORY OEM SERVICE PROCEDURE
Transmission Position Sensor/Switch: Testing and Inspection
TRANSAXLE RANGE (TR) SWITCH INSPECTION [FN4A-EL]
Operating Inspection
1. Verify that the starter operates only when the ignition switch is at the START position with the selector lever in P or N position.
^ If not as specified, adjust the TR switch.
2. Verify that the back-up lights illuminate when shifted to R position with the ignition switch at the ON position.
^ It not as specified, adjust the TR switch.
Continuity Inspection
Caution: Water or foreign objects entering the connector can cause a poor connection or corrosion. Be sure not to drop water or foreign objects on the connector when disconnecting it.
1. Disconnect the negative battery cable.
2. Remove the air cleaner component.
3. Disconnect the TR switch connector.
4. Inspect for continuity at the TR switch.
^ If not as specified, adjust the TR switch and go to Step 4.
5. Reinspect for continuity at TR switch.
^ If not as specified, replace the TR switch.
6. Connect the TR switch connector.
7. Install the air cleaner component.
8. Connect the negative battery cable.
Operating Inspection
1. Verify that the starter operates only when the ignition switch is at the START position with the selector lever in P or N position.
^ If not as specified, adjust the TR switch.
2. Verify that the back-up lights illuminate when shifted to R position with the ignition switch at the ON position.
^ It not as specified, adjust the TR switch.
Continuity Inspection
Caution: Water or foreign objects entering the connector can cause a poor connection or corrosion. Be sure not to drop water or foreign objects on the connector when disconnecting it.
1. Disconnect the negative battery cable.
2. Remove the air cleaner component.
3. Disconnect the TR switch connector.
4. Inspect for continuity at the TR switch.
^ If not as specified, adjust the TR switch and go to Step 4.
5. Reinspect for continuity at TR switch.
^ If not as specified, replace the TR switch.
6. Connect the TR switch connector.
7. Install the air cleaner component.
8. Connect the negative battery cable.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.