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 CX-9 V6-3.5LFACTORY OEM SERVICE PROCEDURE
Vehicle Speed Sensor: Testing and Inspection
VEHICLE SPEED SENSOR (VSS) INSPECTION [AW6A-EL, AW6AX-EL]
On-Vehicle Inspection
Caution:
^ Water or foreign material entering the connector can cause a poor connection or corrosion. Be sure not to allow water or foreign material on the connector when disconnecting.
^ Do not damage the terminals.
1. Disconnect the negative battery cable.
2. Remove the air cleaner component.
3. Remove the TCM.
4. Verify that there is no continuity between the coupler component terminals B19 and GND or B20 and GND.
^ If there is any malfunction, inspect the coupler component.
^ If the coupler component is normal, replace the ATX.
Note:
^ Inspect with a tester that can indicate more than 10 megohms and confirm that the value is more than 1 megohm.
5. Verify that there is continuity between coupler component terminals B19 and B20.
^ If there is any malfunction, inspect the coupler component.
^ If the coupler component is normal, replace the ATX.
6. Install the TCM.
7. Install the air cleaner component.
8. Connect the negative battery cable.
Off-Vehicle Inspection
Warning:
^ A hot transaxle and ATF can cause severe burns. Turn off the engine and wait until they are cool before replacing the ATF.
Caution:
^ Water or foreign material entering the connector can cause a poor connection or corrosion. Be sure not to allow water or foreign material on the connector when disconnecting.
^ Do not damage the terminals.
1. Disconnect the negative battery cable.
2. Remove the VSS.
3. Connect the VSS terminal 2 to the battery positive terminal, connect the battery negative terminal to VSS terminal 1 through an ammeter set to a resistance of 100 ohm.
4. Measure the current while waving a magnet back and forth over the top of the VSS (less than 5 mm (0.197 in)).
^ If there is any malfunction, replace the VSS.
5. Install the VSS.
6. Connect the negative battery cable.
7. Perform the mechanical system test. (See MECHANICAL SYSTEM TEST [AW6A-EL, AW6AX-EL].) Mechanical System Test [AW6A-EL, AW6AX-EL]
On-Vehicle Inspection
Caution:
^ Water or foreign material entering the connector can cause a poor connection or corrosion. Be sure not to allow water or foreign material on the connector when disconnecting.
^ Do not damage the terminals.
1. Disconnect the negative battery cable.
2. Remove the air cleaner component.
3. Remove the TCM.
4. Verify that there is no continuity between the coupler component terminals B19 and GND or B20 and GND.
^ If there is any malfunction, inspect the coupler component.
^ If the coupler component is normal, replace the ATX.
Note:
^ Inspect with a tester that can indicate more than 10 megohms and confirm that the value is more than 1 megohm.
5. Verify that there is continuity between coupler component terminals B19 and B20.
^ If there is any malfunction, inspect the coupler component.
^ If the coupler component is normal, replace the ATX.
6. Install the TCM.
7. Install the air cleaner component.
8. Connect the negative battery cable.
Off-Vehicle Inspection
Warning:
^ A hot transaxle and ATF can cause severe burns. Turn off the engine and wait until they are cool before replacing the ATF.
Caution:
^ Water or foreign material entering the connector can cause a poor connection or corrosion. Be sure not to allow water or foreign material on the connector when disconnecting.
^ Do not damage the terminals.
1. Disconnect the negative battery cable.
2. Remove the VSS.
3. Connect the VSS terminal 2 to the battery positive terminal, connect the battery negative terminal to VSS terminal 1 through an ammeter set to a resistance of 100 ohm.
VSS:
4. Measure the current while waving a magnet back and forth over the top of the VSS (less than 5 mm (0.197 in)).
^ If there is any malfunction, replace the VSS.
5. Install the VSS.
6. Connect the negative battery cable.
7. Perform the mechanical system test. (See MECHANICAL SYSTEM TEST [AW6A-EL, AW6AX-EL].) Mechanical System Test [AW6A-EL, AW6AX-EL]
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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