DTC P0335 Crankshaft Position Sensor "A" Circuit; DTC P0337 Crankshaft Position Sensor "A" Circuit Low Input; DTC P0338 Crankshaft Position Sensor "A" Circuit High Input; DTC P0339 Crankshaft Position Sensor "A" Circuit Intermittent: Description

The crankshaft position sensor system consists of a crank angle sensor plate and Magnetic Resistance Element (MRE) type sensor. The crank angle sensor plate has 34 teeth at 10° intervals (2 teeth are missing for detecting top dead center), and is installed to the rear end of the crankshaft. The crank position sensor outputs 34 rotation signals per engine revolution. The ECM uses the G2 signal to distinguish between the cylinders, and uses the NE signal to detect the crankshaft position and engine RPM.

DTC DETECTION CONDITION AND TROUBLE AREA

DTC No.	DTC Detection Condition	Trouble Area
P0335	No CKP sensor signal to ECM while cranking (1 trip detection logic) When normal G2 signal is input, malfunctioning NE signal is input (1 trip detection logic) No CKP sensor signal to ECM at engine speed of 450 RPM or more (1 trip detection logic)	Open or short in CKP sensor circuit CKP sensor CKP sensor plate ECM
P0337	Output voltage of CKP sensor 0.3 V or less for 4 seconds (1 trip detection logic)	Open or short in CKP sensor circuit CKP sensor CKP sensor plate ECM
P0338	Output voltage of CKP sensor 4.7 V or more for 4 seconds (1 trip detection logic)	Open or short in 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 1000 RPM or more Starter signal OFF 3 seconds or more have lapsed since starter signal switched from ON to OFF	Open or short in CKP sensor circuit CKP sensor CKP sensor plate ECM

Reference: Inspection using an oscilloscope.

Fig 1: NE And G2 Signal Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

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

WAVEFORM REFERENCE

Item	Content
Terminal	NE+ - NE- G2+ - G2-
Equipment Setting	5 V/DIV., 20 msec./DIV.
Condition	Cranking or idling