The failure of the crankshaft position sensor instantly blocks the fuel supply from the injectors and the generation of sparks on the coils. The electronic control unit loses synchronization with the mechanics of the motor, which causes the starter to idle the flywheel.
The complete failure of this sensor makes regular start-up impossible on most modern cars. There are diagnostic algorithms and emergency technical solutions that allow the system to be revived in the field.
Diagnosis of the absence of a DPKV signal
The primary sign of a breakdown is the stationary needle of the tachometer when the starter is rotating. When reading errors, the OBD2 scanner outputs the code P0335, confirming an open circuit or the absence of pulses from the marker disk.
Checking the sensor's power supply circuit requires a minimal set of electrician's tools:
- a multimeter in the resistance measurement mode detects the breakage of the inner winding;
- the LED indicator helps to find the 5 volt reference power supply on the connector;
- visual inspection reveals frayed insulation of the wires near the hot cylinder block.
Inductive sensors often collect metal shavings on a magnetic core from the natural wear of the clutch. The adhering ferromagnetic layer distorts the rectangular pulses, turning them into a continuous background noise for the controller.
Cleaning the sensor end with a cloth restores the signal amplitude to operating values. Before re-installation, the seat is purged with compressed air at a pressure of 2 bar to remove residual engine oil.
Emergency start by camshaft sensor
Engineers put backup algorithms in the firmware of some control units in case of a breakdown of the control system. When the signal from the crankshaft is lost, the system switches to reading the valve timing by the Hall sensor on the block head.
The emergency mode activation procedure requires specific actions from the driver:
- the accelerator pedal is pressed down by 20 percent for additional air supply;
- the ignition key is held in the start position for up to 10 seconds continuously;
- after setting, the pedal keeps the rpm at 2000 per minute.
The engine starts with difficulty in this mode, activating pair-parallel gasoline injection instead of phased. The engine runs hard, does not reach speeds over 3,000 per minute and consumes 30 percent more fuel.
The automatic transmission switches to safety mode, blocking the activation of higher stages. This function is intended exclusively for self-driving the car to the nearest service center at a speed of 40 km/h.
Mechanical ways to revive the sensor
Thermal expansion of the epoxy compound often leads to microcracks in the soldering of contacts inside the plastic housing. Cooling the sensor with a wet cloth or spray freeze temporarily tightens microcracks, restoring the electrical circuit.
Starting the engine after intensive cooling must be carried out immediately, until the heat from the cylinder block breaks the contact again. It is forbidden to turn off the engine until it arrives at the garage, as it will be impossible to restart it on hot water.
The displacement of the sensor relative to the gear pulley due to the loosening of the mounting bolt increases the air gap. Preloading the housing with a mounting blade and tightening the thread with a 10 mm wrench returns the gap to the standard 1 mm. A generous welcome bonus can make all the difference when you're starting out with a new bookmaker. On 1xBet, the process is simple: register an account, fill in your personal information, and during this step, use
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