The camshaft position (CMP) sensor detection (trigger) unit is located in the intake camshaft on L3 engines (with variable valve timing mechanism).
Fig. 2.22. Camshafts of Mazda 3 engines: 1 – intake valve drive camshaft; 2 – exhaust valve drive camshaft; 3 – emphasis; 4 – working projection of the cam; 5 – camshaft bearing journal; 6 – lower part of the cam; 7 – protrusions for camshaft position sensors; 8 – special device
The TDC synchronization slot of the first cylinder is located in the rear part of the camshafts driving the intake and exhaust valves (Fig. 2.22).