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.
2004 Mazda 3 L4-2.0LFACTORY OEM SERVICE PROCEDURE
Transmission Position Sensor/Switch: Testing and Inspection
TRANSAXLE RANGE (TR) SWITCH INSPECTION
Operating Inspection
1. Verify that the starter operates only when the ignition switch is turned to the START position with the selector lever in P or N position.
^ If there is any malfunction, 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.
^ If there is any malfunction, adjust the TR switch.
3. Verify that the positions of the selector lever and the indicator are aligned. If there is any malfunction, adjust the TR switch.
Continuity Inspection
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.
1. Remove the battery duct and battery cover.
2. Disconnect the negative battery cable.
3. Remove the under cover.
4. Disconnect the TR switch connector.
5. Verify that the continuity is as indicated in the table. If there is any malfunction, adjust the TR switch and go to Step 5.
Resistance Inspection (On-Vehicle Inspection)
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.
1. Remove the battery duct and battery cover.
2. Disconnect the negative battery cable.
3. Remove the under cover.
4. Disconnect the TR switch connector.
5. Measure the resistance between the following terminals. If there is any malfunction, inspect the ground, then perform the operating inspection.
6. Connect the TR switch connector.
7. Install the under cover.
8. Connect the negative battery cable.
9. Install the battery duct and battery cover.
Operating Inspection
1. Verify that the starter operates only when the ignition switch is turned to the START position with the selector lever in P or N position.
^ If there is any malfunction, 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.
^ If there is any malfunction, adjust the TR switch.
3. Verify that the positions of the selector lever and the indicator are aligned. If there is any malfunction, adjust the TR switch.
Continuity Inspection
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.
1. Remove the battery duct and battery cover.
2. Disconnect the negative battery cable.
3. Remove the under cover.
4. Disconnect the TR switch connector.
5. Verify that the continuity is as indicated in the table. If there is any malfunction, adjust the TR switch and go to Step 5.
Resistance Inspection (On-Vehicle Inspection)
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.
1. Remove the battery duct and battery cover.
2. Disconnect the negative battery cable.
3. Remove the under cover.
4. Disconnect the TR switch connector.
5. Measure the resistance between the following terminals. If there is any malfunction, inspect the ground, then perform the operating inspection.
6. Connect the TR switch connector.
7. Install the under cover.
8. Connect the negative battery cable.
9. Install the battery duct and battery cover.
Factory Service Tools
Use the Manual With the Right Hardware
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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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