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.
1988 Mazda 929 AutomaticFACTORY OEM SERVICE PROCEDURE
CARBURETED Models: B2600
- Warm engine to normal operating temperature. Connect voltmeter to terminal "YR" of the purge solenoid valve and ground. Connect tachometer to engine.
- Gradually increase engine speed. Check that voltmeter indicates zero volts when engine speed is greater than 1400 RPM. If not, check terminal "1C" of Emission Control Unit (ECU) for proper contact and the coolant thermosensor. If wiring and thermosensor are okay, replace ECU. Retest system.
- Disconnect vacuum hose from vacuum switch. Connect vacuum pump with gauge to switch. Apply vacuum. Voltmeter should read 12 volts when vacuum reaches 7.9 in. Hg. If not, check terminals "1E" of ECU and vacuum switch for poor connections. If wiring and vacuum switch are okay, replace ECU. Retest system.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.