Where is crank sensor located on 2004 nissan altima 2.5 litre
Crankshaft and Camshaft Position Sensors
Camshaft Position Sensor
Engine timing is determined from the relationship between the crankshaft and camshaft. This relationship is maintained by a timing chain or timing belt. The Engine Management System does not control engine timing but it does monitor the relative position and speed of these shafts by monitoring signals generated by sensors. The Engine Management System (EMS) uses signals generated by the camshaft position sensor to synchronize fuel injection to the valve sequence and for the on-board diagnostic procedure for misfire detection. The EMS energizes the injector at or near the time the intake valve opens. For misfire diagnosis, the EMS compares the number of camshaft sensor reference pulses and the number of crankshaft position sensor reference pulses received. If the EMS receives an incorrect number of pulses Diagnostic Trouble Codes (DTC’s) should be stored in the EMS.
If the camshaft position sensor or circuit is faulty most engines will start. Some engine management systems will then default to a pre-programmed injector firing sequence. All injectors may be energized simultaneously or all of the injectors on one bank may be energized at the same time. If the CMP data is required for misfire detection and reliable CMP data is not present misfire detection would probably be suspended.
Related Symptoms
The following symptoms can be caused by an intermittent wiring connection or faulty signal to the EMS:
Crankshaft Position Sensor
Engine speed is a very important input to the Engine Management System (EMS). Crankshaft speed and position are the basis for many calculations made by the computer. Crankshaft position values are transmitted to the computer by pickup coils also known as Permanent Magnet (P/M) generators, hall-effect sensors or optical sensors. The Crankshaft Position Sensor (CKP) also known as engine speed sensor is located in close proximity to the crankshaft.
In addition the EMS uses minute variations in the CKP sensor data to determine engine misfire. The EMS uses this information in conjunction with the camshaft position sensor to perform misfire diagnostics.
Related Symptoms:
No Start/Intermittent Start Condition – Can be caused by a faulty crankshaft position sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit
CKP System Variation Learn Procedure
The scan tool monitors certain component signals to determine if all conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure while monitoring the following components:CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that was set
Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that was set
Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the ECT reaches normal operating temperature
NOTE: For additional diagnostic information, refer to DTC P1336. Install a scan tool
Monitor the powertrain control module for diagnostic trouble codes (DTCs). If other DTCs are set, except DTC P1336, refer to the Diagnostic Trouble Code List for the applicable DTC that was set
Select the crankshaft position (CKP) variation learn procedure
Observe the fuel cut-off
The scan tool instructs you to perform the following:
Block the drive wheels
Apply the vehicles parking brake
Cycle the ignition from OFF to ON
Maintain pressure on the brake pedal
Start and idle the engine
Place the vehicles transmission in Park (A/T) or Neutral (M/T).
With the scan tool, enable the CKP system variation learn procedure.
Slowly increase the engine speed to the RPM that you observed.
NOTE: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. Immediately release the throttle when fuel cut-off is reached
The scan tool should display the Learn Status: "Learned this ignition"
If the scan tool does not display this message and no additional DTCs set, refer to Symptoms - Engine
If a DTC set, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC that set
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully
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