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.
1994 Mazda 929FACTORY OEM SERVICE PROCEDURE
Circuit Opening Relay
- With relay connected, ensure battery voltage is present at relay terminal Black/White wire. For locations of circuit opening relay, see CIRCUIT OPENING RELAY LOCATION table.
- If voltages are okay, remove relay from vehicle. Using a 12-volt battery source, connect 12 volts to relay terminals "A" and "B". Ensure continuity is present across terminals "C" and "D". If continuity is not as specified, replace circuit opening relay.
CIRCUIT OPENING RELAY LOCATION
| Application | Location |
|---|---|
| 929 | In Engine Compartment Relay Box, Near Battery |
CIRCUIT OPENING RELAY CIRCUIT VOLTAGE
| Terminal | Ignition ON: Volts | Ignition START: Volts | Idle Volts |
|---|---|---|---|
| Fp | 0 | 12 | 12 |
| Fc | 12 | 0 | 0 |
| B | 12 | 12 | 12 |
| STA | 0 | 12 | 0 |
| E1 | 0 | 0 | 0 |
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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