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 wound copper wire, an iron core and magnet. The sensor plate rotates and, as each tooth passes by the pickup coil, a pulse signal is created. The pickup coil generates 34 signals per crankshaft revolution. Based on these signals, the ECM calculates the crankshaft position and engine speed. Using these calculations, the fuel injection time and ignition timing are controlled.

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P0335	When either of the following conditions is met (1 trip detection logic): A missing crankshaft position sensor signal despite the camshaft position sensor signal inputs being normal after the engine is cranked. No crankshaft position sensor signal to the ECM at an engine speed of 600 rpm or less.	Open or short in crankshaft position sensor circuit Crankshaft position sensor Crankshaft (crank angle sensor plate) ECM
P0339	All of the following conditions are met (1 trip detection logic): The engine speed is 1000 rpm or more. No crankshaft position sensor signal for 0.05 seconds or more. 3 seconds or more have elapsed since the starter signal switched from ON to OFF.	Open or short in crankshaft position sensor circuit Crankshaft position sensor Crankshaft (crank angle sensor plate) ECM

Reference: Inspection using an oscilloscope.

Fig 1: Identifying Signal Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The correct waveform is as shown.
G2 stands for the camshaft position sensor signal, NE stands for the crankshaft position sensor signal (for intake side) and EV1 stands for the camshaft position sensor (for exhaust side) signal.

Grounding failure of the shielded wire may cause noise in waveforms.

TOOL SETTING CHART

Terminal No. (Symbol)	Tool Setting	Condition
B50-14 (NE+) - B50-2 (NE-)	5 V/DIV, 20 ms/DIV	Idling
B49-76 (G2+) - B49-5 (G2-)	5 V/DIV, 20 ms/DIV	Idling
B50-75 (EV1+) - B50-1 (EV1-)	5 V/DIV, 20 ms/DIV	Idling