Check that the spool valve is not stuck

HINT:

The spool valve may not return if foreign objects are caught in it. This may cause subtle pressure leakage to the advance side, and a DTC may, be set.

DTC

P0340

Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

DTC

P0342

Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)

DTC

P0343

Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)

DTC

P0345

Camshaft Position Sensor "A" Circuit (Bank 2)

DTC

P0347

Camshaft Position Sensor "A" Circuit Low Input (Bank 2)

DTC

P0348

Camshaft Position Sensor "A" Circuit High Input (Bank 2)

DESCRIPTION

The Variable Valve Timing (VVT) sensor (VV signal) consists of a magnet, iron core and pickup coil. The VV signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating a voltage in the pickup coil. This sensor monitors a timing rotor located on the camshaft and is used to detect the camshaft angle by the ECM. The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates the rotation of the camshaft timing rotor as a pulse signal to the ECM. Based on this signal, the ECM controls fuel injection time and ignition timing.

DTC No.

DTC Detection Conditions

Trouble Areas

P0340 P0345

• Input voltage to ECM remains 0.3 V or less, or 4.7 V or higher for more than 5 seconds, when 2 or more seconds have elapsed after turning ignition switch ON (2 trip detection logic)

• No VVT sensor signal to ECM during cranking (1 trip detection logic)

• Open or short in VVT sensor circuit

• Camshaft timing pulley

• Jumped tooth of timing chain

• ECM

P0342 P0347

Output voltage of VVT sensor 0.3 V or less for 5 seconds (1 trip detection logic)

CO CO

44 33 00 PP

Output voltage of VVT sensor 4.7 V or more for 5 seconds (1 trip detection logic)

VV1, VV2 and NE Signal Waveforms

VV1 VV2

■■■■■■■iillll

GND GND

tz

T

J:

T

IL

GND

¡z

ZL

it

m

¡z

N

G035795E10

Reference: Inspection using an oscilloscope HINT:

• The correct waveform is shown above.

• VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.

Items

Contents

Terminals

NE+ - NE-VV1+ - VV1-VV2+ - VV2-

Equipment Settings

5V/Division, 20ms/Division

Conditions

Cranking or idling

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