CIRCUIT INSPECTION DTC 12 G NE Signal Circuit (No.1) CIRCUIT DESCRIPTION Camshaft position sensors (G1 and G2 signals) are mounted on the intake side of the cylinder head and the crankshaft position sensor (NE signal) is mounted on the oil pump body. These sensors consist of a timing rotor and pick up coil. The G1, G2 timing rotors have 1 tooth each on their outer circumference and are mounted on the intake camshaft. When the intake camshaft rotates, the protrusion on the timing rotors and the air gap on the pick up coil change, causing fluctions in the magnetic field and generating an electromotive force in the pick up coil. The NE timing rotor has 12 teeth and is mounted on the crankshaft. The NE signal sensor generates 12 NE signals per engine revolution. The ECM detects the standard crankshaft angle based on the G1, G2 signals, and the actual crankshaft angle and the engine speed by the NE signals. Cylinder Head Front Air Gap Camshaft Position Sensor No.2 (G2) Intake Camshaft Camshaft Position Sensor No.1 (G1) Camshaft Position Sensor Timing Rotor Timing Rotor Crankshaft Position Sensor Crankshaft Timing Pulley FI6920 FI6921 FI6922 DTC No. | Diagnostic Trouble Code Detecting Condition | Trouble Area 12 | No "NE" or "G1" and "G2" signal to ECM for 2 sec. or more after cranking | • Open or short in crankshaft position sensor, camshaft position sensor No.1, No.2 circuit • Crankshaft position sensor • Camshaft position sensor No.1, No.2 • Starter • ECM