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 MANUALSMAZDA1991PROTEGE L4-1839CC 1.8L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONSWITCH MONITOR FUNCTION
1991 Mazda Protege L4-1839cc 1.8L SOHC
Switch Monitor Function
1991 Mazda Protege L4-1839cc 1.8L SOHCSECTION Switch Monitor Function
Switch Monitor Function:
^ The ECU Switch Monitor Function permits checking individual switches with Mazda Self-Diagnosis Checker (SST #49 H018 9A1) or a compatible aftermarket "Scan" tool.
^ With ignition switch "ON" and diagnosis connector "TEN" terminal grounded, the SST will check switches as indicated on the image chart.
^ Consult aftermarket "Scan" tool instructions for proper use of this function.
RENDER: 1.0x
NO RELATED
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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.