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
Relay Box: Testing and Inspection
RELAY INSPECTION
Relay type
Type A
1. Remove the relay.
2. Verify that the continuity between the relay terminals.
a. Verify that the continuity between terminals E and A.
- If it can be verified, go to the next procedure.
- If it cannot be verified, replace the relay.
b. Apply battery positive voltage to terminal E, and connect terminal A to ground. Verify that the continuity between terminals C and D.
- If it cannot be verified, replace the relay.
Type B
1. Remove the relay.
2. Verify that the continuity between the relay terminals.
a. Verify that the continuity between terminals E and A.
- If it can be verified, go to the next procedure.
- If it cannot be verified, replace the relay.
b. Apply battery positive voltage to terminal E, and connect terminal A to ground. Verify that the continuity between terminals C and D.
- If it cannot be verified, replace the relay.
Type C
1. Remove the relay.
2. Verify that the continuity between the relay terminals.
a. Verify that the continuity between terminals E and A.
- If it can be verified, go to the next procedure.
- If it cannot be verified, replace the relay.
b. Verify that the continuity between terminals B and D.
- If it can be verified, go to the next procedure.
- If it cannot be verified, replace the relay.
c. Apply battery positive voltage to terminal E, and connect terminal A to ground. Verify that the continuity between terminals C and D.
- If it cannot be verified, replace the relay.
Type D
1. Remove the relay.
2. Verify that the continuity between the relay terminals.
a. Verify that the continuity between terminals B and D.
- If it can be verified, go to the next procedure.
- If it cannot be verified, replace the relay.
b. Apply battery positive voltage to terminal B, and connect terminal D to ground. Verify that the continuity between terminals A and C.
- If it cannot be verified, replace the relay.
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.