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Home >> Lexus >> 2008 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P1340 Camshaft Position Sensor "A" (Bank 1 Sensor 2) >> Description

DTC P1340 Camshaft Position Sensor "A" (Bank 1 Sensor 2): Description

The camshaft position sensor (G signal) consists of a magnet and MRE element.

The camshaft drive gear (LH) has 3 teeth on its inner circumstance. When the camshaft gear rotates, air gap changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field and results in changes in the resistance of the MRE element.

The crankshaft signal plate has 34 teeth and is mounted on the crankshaft. The crankshaft position sensor generates 34 signals at every engine revolution. The ECM detects the standard crankshaft angle based on the G signal and the actual crankshaft angle and the engine speed by the NE signal.

DTC DETECTION CONDITION CHART

DTC No. DTC Detection Condition Trouble Area
P1340 No camshaft position sensor signal to ECM during cranking (2 trip detection logic)
  • Open or short in camshaft position sensor circuit
  • Camshaft position sensor
  • Camshaft timing pulley LH
  • ECM
No camshaft position sensor signal to ECM with engine speed 600 rpm or more