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.
2012 Mazda 5 L4-2.5LFACTORY OEM SERVICE PROCEDURE
Transmission Position Sensor/Switch: Testing and Inspection
TRANSAXLE RANGE (TR) SWITCH INSPECTION [FS5A-EL]
CAUTION:
- Do not allow foreign material or water to penetrate the connector. Otherwise, it could cause poor contact and corrosion.
System Inspection
1. Verify that the engine starts when the selector lever is in the P or N position only.
2. Verify that the back-up light illuminates when the selector lever is in the R position.
3. Verify that the displays for the shifted position and shift position indicator light are the same when the selector lever is shifted to each position.
- If there is any malfunction, adjust the TR switch. Adjustments
On-Vehicle Inspection
1. Apply the parking brake firmly, and set the wheel blocks for both the front and rear wheels.
2. Disconnect the TR switch connector.
a. Remove the battery cover. Removal and Replacement
b. Disconnect the negative battery cable.
c. Remove the air cleaner component. Service and Repair
d. Disconnect the TR switch connector.
3. Measure the resistance and continuity between the TR switch terminals.
- If there is any malfunction, adjust the TR switch. Adjustments
- If a malfunction occurs after performing adjustments, replace the TR switch. Service and Repair
TR switch continuity
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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