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 MANUALSMAZDA1999PROTEGE ES, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICS - 1.8LDIAGNOSTIC TESTSDTC P1345: NO SGC SIGNALCONDITION
1999 Mazda Protege ES, Automatic
DTC P1345: No SGC Signal: Condition
1999 Mazda Protege ES, AutomaticSECTION Condition
DTC is set when single or double Camshaft Position (CMP) sensor signal does not match set criteria in PCM, and Mass Air Flow (MAF) sensor is more than .3 lbs/Min. Possible causes are:
- CMP sensor malfunction.
- Metal particles on CMP sensor.
- Improper CMP sensor installation.
- Poor connection of PCM and CMP sensor connectors.
- Open or short circuit between terminal "A" on CMP sensor and terminal No. 85 on Powertrain Control Module (PCM).
- Open or short circuit between terminal "B" on CMP sensor and terminal No. 86 on Powertrain Control Module (PCM).
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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.