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.
2007 Mazda 3 L4-2.0LFACTORY OEM SERVICE PROCEDURE
Transmission Position Sensor/Switch: Adjustments
TRANSAXLE RANGE (TR) SWITCH ADJUSTMENT [FN4A-EL]
1. Remove the battery duct and battery cover.
2. Disconnect the negative battery cable.
3. Remove the under cover.
Caution: Water or foreign material entering the connector can cause a poor connection or corrosion. Be sure not to drop water or foreign material on the connector when disconnecting it.
4. Remove the clip and disconnect the selector cable.
5. Rotate the manual shaft to the converter housing side fully, then return two notches to set the N position.
6. Disconnect the TR switch connector.
7. Loosen the TR switch mounting bolts.
8. Measure the resistance between the TR switch terminals B and C.
9. Adjust the switch to the point as follows.
Resistance 750 ohms
10. Tighten the TR switch mounting bolts.
Tightening torque 8 - 11 N-m (82 - 112 kgf-cm, 71 - 97 in-lbf)
11. Move the selector lever to N position.
12. Verify that the TR switch is aligned with N position.
13. Connect the TR switch connector.
14. Install the clip to the selector cable as shown in the figure.
15. Connect the selector cable to the manual shaft lever as shown in the figure.
16. Inspect the TR switch operation. If there is any malfunction, readjust the TR switch.
17. Install the under cover.
18. Connect the negative battery cable.
19. Install the battery duct and battery cover.
1. Remove the battery duct and battery cover.
2. Disconnect the negative battery cable.
3. Remove the under cover.
Caution: Water or foreign material entering the connector can cause a poor connection or corrosion. Be sure not to drop water or foreign material on the connector when disconnecting it.
4. Remove the clip and disconnect the selector cable.
5. Rotate the manual shaft to the converter housing side fully, then return two notches to set the N position.
6. Disconnect the TR switch connector.
7. Loosen the TR switch mounting bolts.
8. Measure the resistance between the TR switch terminals B and C.
9. Adjust the switch to the point as follows.
Resistance 750 ohms
10. Tighten the TR switch mounting bolts.
Tightening torque 8 - 11 N-m (82 - 112 kgf-cm, 71 - 97 in-lbf)
11. Move the selector lever to N position.
12. Verify that the TR switch is aligned with N position.
13. Connect the TR switch connector.
14. Install the clip to the selector cable as shown in the figure.
15. Connect the selector cable to the manual shaft lever as shown in the figure.
16. Inspect the TR switch operation. If there is any malfunction, readjust the TR switch.
17. Install the under cover.
18. Connect the negative battery cable.
19. Install the battery duct and battery cover.
Factory Service Tools
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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.
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