DTC P0335 Crankshaft Position Sensor "A" Circuit; DTC P0339 Crankshaft Position Sensor "A" Circuit Intermittent: Description

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

The crankshaft position (CKP) sensor system consists of a crankshaft position sensor plate and a magnetic coil.

The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of windings, an iron core and magnet. The sensor plate rotates and as each tooth passes through the pickup coil, a pulse signal is created. The pickup coil generates 34 signals for each engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition time are controlled.

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P0335	No CKP sensor signal to ECM while cranking (1 trip detection logic) No CKP sensor signal to ECM at engine speed of 600 rpm or more (1 trip detection logic)	Open or short in Crankshaft Position (CKP) sensor circuit CKP sensor CKP sensor plate ECM
P0339	Under conditions (a), (b) and (c), no CKP sensor signal to ECM for 0.05 seconds or more (1 trip detection logic): Engine speed 1,000 rpm or more Starter signal OFF 3 seconds or more have elapsed since starter signal switched from ON to OFF	Open or short in Crankshaft Position (CKP) sensor circuit CKP sensor CKP sensor plate ECM

Reference: Inspection using an oscilloscope.

Fig 1: VV1, VV2 And NE Signal Waveform

HINT:

The correct waveform is as shown.
VV1 + and VV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.

WAVEFORM REFERENCE

Item	Content
Terminals	VV1+ - VV1- VV2+ - VV2- NE+ - NE-
Equipment Settings	5 V/DIV, 20 ms/DIV.
Conditions	Cranking or idling