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

WARNING: This page is about a different variant/trim than selected.

The crankshaft position sensor system consists of a crankshaft position sensor plate and a pickup coil. The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of an iron core and a magnet.

The sensor plate rotates as each tooth passes through the pickup coil, and a pulse signal is created. The pickup coil generates 34 signals per engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition timing are controlled.

DTC No.	DTC Detection Condition	Trouble Area
P0335	No crankshaft position sensor signal to ECM while cranking (1 trip detection logic) No crankshaft position sensor signal to ECM at engine speed of 600 RPM or more (1 trip detection logic) Missing crankshaft position sensor signal despite VVT sensor signal inputs normal after engine cranked (1 trip detection logic)	Open or short in crankshaft position sensor circuit Crankshaft position sensor Sensor plate (crankshaft position sensor plate) ECM
P0339	Under conditions (a), (b) and (c), no crankshaft position sensor signal to ECM for 0.05 seconds or more (1 trip detection logic): (a) Engine speed 1000 RPM or more (b) Starter signal OFF (c) 3 seconds or more have lapsed since starter signal switched from ON to OFF	Open or short in crankshaft position sensor circuit Crankshaft position sensor Sensor plate (crankshaft position sensor plate) ECM

Reference: Inspection using an oscilloscope

Fig 1: Identifying VV1, VV2 & NE Signal Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The correct waveform is shown in the illustration.

VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the crankshaft position sensor signal.

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