DTC P1340 Camshaft Position Sensor "A" (Bank 1 Sensor 2); DTC P1342 Camshaft Position Sensor "A" Low Input (MRE); DTC P1343 Camshaft Position Sensor "A" High input (MRE): Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
The camshaft position sensor system consists of a signal plate (installed on the camshaft timing gear RH) and magnetic resistance element type cam position sensor. The signal plate has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the camshaft's magnetic resistance element varies, which causes its resistance to vary This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs As a result, the G2 signal is output to the ECM. The ECM uses the G2 signal to distinguish between the cylinders and detect the camshaft position.
DTC DETECTION CONDITION CHART
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P1340 | When either of the following conditions is met
|
|
| P1342 | Output voltage of camshaft position sensor less than 0 3 V for 4 seconds (1 trip detection logic) | |
| P1343 | Output voltage of camshaft position sensor more than 4 7 V for 4 seconds (1 trip detection logic) |
Reference. Inspection using an oscilloscope
HINT
- The correct waveform is as shown
- The wavelength becomes shorter as the engine speed increases.
- G2+ and G2- stand for the camshaft position sensor signal, and NE+ stands for the crankshaft position sensor signal.
ITEM CONTENT CHART
| Item | Content |
|---|---|
| Terminal | NE+-NE- G2+ - G2- |
| Equipment Setting | 5 V/DIV, 20 msec /DIV |
| Condition | Cranking or idling |