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ES–1961GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMESDESCRIPTIONThe 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 a 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 the signal, the ECM controls fuel injection time and ignition timing.Reference: Inspection using an oscilloscopeDTCP0340Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)DTCP0342Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)DTCP0343Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)DTCP0345Camshaft Position Sensor "A" Circuit (Bank 2)DTCP0347Camshaft Position Sensor "A" Circuit Low Input (Bank 2)DTCP0348Camshaft Position Sensor "A" Circuit High Input (Bank 2)DTC No.DTC Detection ConditionsTrouble AreasP0340P0345•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 the 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•VVT sensor•Camshaft timing pulley•Jumped tooth of timing chain•ECMP0342P0347Output voltage of VVT sensor is 0.3 V or less for 5 seconds (1 trip detection logic)•Open or short in VVT sensor circuit•VVT sensor•Camshaft timing pulley•Jumped tooth of timing chain•ECMP0343P0348Output voltage of VVT sensor is 4.7 V or more for 5 seconds (1 trip detection logic)•Open or short in VVT sensor circuit•VVT sensor•Camshaft timing pulley•Jumped tooth of timing chain•ECM
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–197ESHINT:• The correct waveform is shown on the illustration.• VV1+ and VV2+ stands for the VVT sensor signal, and NE+ stands for the CKP sensor signal.MONITOR DESCRIPTIONIf there is no signal from the VVT sensor even though the engine is turning, or if the rotation of the camshaft and crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.MONITOR STRATEGYTYPICAL ENABLING CONDITIONSAll:ItemsContentsTerminalsNE+ - NE-VV1+ - VV1-VV2+ - VV2-Equipment Settings5V/Division, 20ms/DivisionConditionsCranking or idlingRelated DTCsP0340: Camshaft position sensor range checkP0340: Camshaft position/crankshaft position misalignmentP0340: Camshaft position sensor range check (Chattering)P0342: Camshaft position sensor range check (Low voltage)P0343: Camshaft position sensor range check (High voltage)P0345: VVT sensor range check (While starting engine)P0345: VVT sensor range check (After starting engine)P0345: VVT sensor range check (Chattering)P0347: VVT sensor range check (Low voltage)P0348: VVT sensor range check (High voltage)Required Sensors / Components (Main)VVT sensor, Camshaft position sensorRequired Sensors / Components (Related)Crankshaft position sensorFrequency of OperationContinuousDuration4 seconds:P0340 (Camshaft position sensor range check), P0345 (VVT sensor range check (While starting engine))5 seconds:OthersMIL Operation2 driving cycles:P0340 (Camshaft position sensor range check), P0345 (VVT sensor range check (While starting engine))Immediate:OthersSequence of OperationNoneThe monitor will run whenever these DTCs are not presentNoneGND5 V/DIV.20 ms/DIV.NEVV1VV2GNDVV1, VV2 and NE Signal WaveformsGNDG035795E20