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.
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HOMESERVICE MANUALSMAZDA2004B4000 4WD V6-4.0L SOHCREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINTRANSFER CASETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICS
2004 Mazda B4000 4WD V6-4.0L SOHC
Component Tests and General Diagnostics
2004 Mazda B4000 4WD V6-4.0L SOHCSECTION Component Tests and General Diagnostics
TRANSFER CASE ELECTRONIC SHIFT CONTROL RELAY COMPONENT TEST
Perform this test when directed to in the pinpoint tests.
1. Remove electronic shift control relay from relay box connector X-03 located under the driver side instrument panel.
2. Measure resistance between terminal 2 and terminals 1, 3, 4 and 5. If resistance is 5 ohms or less between terminal 2 and any other terminal, replace the relay. If resistance is greater than 5 ohms, go to step 3.
3. Use two jumper wires to connect terminals 1 and 3 directly to the positive battery terminal. Measure voltage at terminal 4. If there is no battery voltage, replace the relay. If there is battery voltage, go to step 4.
4. Connect a third jumper wire to terminal 2 and a known good ground. Measure voltage at terminal 5. If there is no battery voltage, replace the relay.
Perform this test when directed to in the pinpoint tests.
1. Remove electronic shift control relay from relay box connector X-03 located under the driver side instrument panel.
2. Measure resistance between terminal 2 and terminals 1, 3, 4 and 5. If resistance is 5 ohms or less between terminal 2 and any other terminal, replace the relay. If resistance is greater than 5 ohms, go to step 3.
3. Use two jumper wires to connect terminals 1 and 3 directly to the positive battery terminal. Measure voltage at terminal 4. If there is no battery voltage, replace the relay. If there is battery voltage, go to step 4.
4. Connect a third jumper wire to terminal 2 and a known good ground. Measure voltage at terminal 5. If there is no battery voltage, replace the relay.
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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.