Dtc P0335 Crankshaft Position Sensor A Circuit

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fe Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT CRANKSHAFT POSITION SENSOR

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)

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 crankshaft position sensor plate and a magnetic coil.
The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of windings, an iron core and 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 for each engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition time are controlled.

DTC No.
DTC Detection Condition
Trouble Area
P0335
  1. No CKP sensor signal to ECM while cranking (1 trip detection logic)
  1. No CKP sensor signal to ECM at engine speed of 600 rpm or more (1 trip detection logic)
  1. Open or short in CKP sensor circuit
  2. CKP sensor
  3. CKP sensor plate
  4. ECM
P0339
Under conditions (a), (b) and (c), no CKP sensor signal to ECM for 0.05 seconds or more
(1 trip detection logic):
(a) Engine speed 1,000 rpm or more
(b) Starter signal OFF
(c) 3 seconds or more have lapsed since starter signal switched from ON to OFF
  1. Open or short in CKP sensor circuit
  2. CKP sensor
  3. CKP sensor plate
  4. ECM

  1. Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0335 Crankshaft Position Sensor A Circuit
    Reference: Inspection using an oscilloscope.
    HINT:
    1. The correct waveform is as shown.
    1. VV1+ and VV2+ stands for the VVT sensor signal, and NE+ stands for the CKP sensor signal.
    Item
    		Content
    Terminals
    		VV1+ - VV1-
    VV2+ - VV2-
    NE+ - NE-
    Equipment Settings
    		5 V/DIV., 20 msec./DIV.
    Conditions
    		Cranking or idling

MONITOR DESCRIPTION

If there is no signal from the crankshaft position sensor despite the engine revolving, the ECM interprets this as a malfunction of the sensor.
If the malfunction is not repaired successfully, these DTCs are set 10 seconds after the engine is next started.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0335 Crankshaft Position Sensor A Circuit


INSPECTION PROCEDURE

HINT:
  1. If no problem is found by this diagnostic troubleshooting procedure, troubleshooting the engine mechanical system.
  2. Check the engine speed. The engine speed can be checked by using the intelligent tester. To check, follow the operation below:
    1. Connect the intelligent tester to the DLC3.
    2. Start the engine.
    3. Turn the tester ON
    4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.
    1. The engine speed may be indicated as zero despite the engine revolving normally. This is caused by a lack of NE signals from the crankshaft position (CKP) sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed, if the CKP sensor output voltage is insufficient.
  3. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.INSPECT CRANKSHAFT POSITION SENSOR
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0335 Crankshaft Position Sensor A Circuit

  1. Disconnect the E3 crankshaft position (CKP) sensor connector.

  1. Measure the resistance between terminal 1 and 2.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Cold
    		1,630 to 2,740 Ω
    1 - 2
    		Hot
    		2,065 to 3,225 Ω
    HINT:
    Terms cold and hot refer to the temperature of the coils. Cold means approximately -10 to 50°C (14 to 122°F). Hot means approximately 50 to 100°C (122 to 212°F).

  1. Reconnect the CKP sensor connector.



NG
REPLACE CRANKSHAFT POSITION SENSOR
OK


2.CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0335 Crankshaft Position Sensor A Circuit

  1. Disconnect the E3 CKP sensor connector.

  1. Disconnect the E8 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    E3-1 - NE+ (E8-32)
    		Below 1 Ω
    E3-2 - NE- (E8-31)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    E3-1 or NE+ (E8-32) - Body ground
    		10 kΩ or higher
    E3-2 or NE- (E8-31) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the CKP sensor connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0335 Crankshaft Position Sensor A Circuit

  1. Check the CKP sensor installation.

    OK:
    Sensor is installed correctly.


NG
TIGHTEN SENSOR
OK


4.CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)

  1. Check the teeth of the sensor plate.

    OK:
    Sensor plate does not have any crack or deformation.


NG
REPLACE CRANKSHAFT POSITION SENSOR PLATE
OK

REPLACE ECM