Wholesalers and workshops benefit from smart consolidation with DENSO Lambda Sensors
Removal and installation
- Disconnect the Sensor’s connector and wiring if it exists. Remove the screw(s). Remove the Sensor.
- Install the new sensor and the screw(s) according to the tightening torque value specified by the car maker and then connect the connector and sensor wiring if exists. Turn the engine on and check if the system works properly.
- Take care – the Camshaft & Crankshaft Sensors are a delicate piece of hardware that can be damaged when installing.
> Do not allow moisture, chemicals or any other foreign materials between connector and sensor terminal pins.
> Do not place sensors in areas where excess electric static discharge is continuously applied.
> Furthermore, do not place the sensor tips closely to each other nor approximate to a magnet, in order to prevent deviation of the sensor characteristics. Also, do not allow any iron powder to attach to the sensor.
> The information received from Camshaft and Crankshaft Position Sensors is used by engine ECU to control the injection timing and ignition timing (spark advance). Characteristics discrepancies, open or short circuits, a disruption of the supply voltage may cause a variety of drivability problems.
> Most common causes of failure are scratches on the magnetic surface of the sensor, foreign material adhering to the magnetic surface of the sensor, exposure to significant high heat and wear and tear in the sensor wiring if it exists.
> Stalling: typically after starting or time to time
> Poor drivability: Hesitation during acceleration, misfire, loss of engine power
> Starting problems: Intermittent starting or no-start at all
Prevention and solutions
> A problem with Camshaft and Crankshaft Position Sensors can cause the engine warning light to turn on. This fault is stored as a diagnostic trouble code (DTC) in the engine ECU (P0335…P0349) and can be inspected by a DTC scan tool.
> If the Camshaft and Crankshaft Position Sensors signals are not inputted to the ECU, the correct TDC cannot be detected. The engine may be damaged if the correct TDC is not detected. Therefore, at times such as when a DTC related to the Camshaft and Crankshaft Position Sensors signal is recorded, or when there is disparity between the sensor signals, fail-safe control can suspend ignition and fuel injection.
> During cranking, use the scan tool oscilloscope function to inspect the sensor’s voltage waveform for diagnosing the malfunction area. In case of normal waveform, inspect for faulty ECU, open or short circuit problems in wiring. In case of no waveform, inspect for faulty sensor.
> During installation, make sure the timing rotor or sprocket does not touch the magnetic surface of the sensor. (Select correct thickness shim and/or assure proper clearance).