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

The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a pickup coil. The sensor plate has 34 teeth and it is installed on the crankshaft. The pickup coil is made of an iron core and a 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 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 DETECTION CONDITIONS AND TROUBLE AREAS REFERENCE

DTC No.	DTC Detection Conditions	Trouble Areas
P0335	No CKP sensor signal to ECM while cranking (2 trip detection logic) No CKP sensor signal to ECM at engine speed of 600 rpm or more (2 trip detection logic)	Open or short in CKP sensor circuit CKP sensor Sensor plate (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 has lapsed since starter signal switched from ON to OFF	Open or short in CKP sensor circuit CKP sensor Sensor plate (CKP sensor plate) ECM

Reference: Inspection using an oscilloscope.

Fig 1: Oscilloscope Wave Reference

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The correct waveform is shown on the left.

G2+ stands for the Camshaft Position (CMP) sensor signal, and NE+ stands for the CKP sensor signal.

DIAGNOSTIC PROCEDURE

Items	Contents
Terminals	CH1 : G2 + -NE- CH2: NE+ - NE-
Equipment Settings	5V/Division, 20ms/Division
Conditions	Cranking or idling