We are attempting to change the Crankshaft Angle Sensor and struggling with what all needs to be taken off of the engine to get to the bottom of the sensor. 2004 Hyundai Sonata.

I believe you will have a crank sensor behind the main crankshaft pulley on the oil pan flange. There is also a crank angle sensor in the bottom of the distributor.

no, the crank is on the bottom of the engine and is on the end of the crankshaft where the connecting rods to the pistons are.

The cams are at the top of the engine and open and close the inlet and exhaust valves.

Unlikely they are the same part.

The role of the crankshaft position sensor is to determine the position of the crankshaft, the crankshaft angle. It is usually with a camshaft position sensor work together - to determine the basic ignition timing. Car Diagnostic Tool

Hi Willem, Code 18 is a Crankshaft position sensor/Camshaft position sensor............ P0018
Crankshaft Position Camshaft Position/Correlation (Bank 2 Sensor A)
Crankshaft Position Sensor car not starting coil spark

Camshaft Position Sensor P0340 Testing and Replacement HD

That is a common crankshaft angle sensor trait just before it quits completely. Find your crank angle sensor (almost behind the crankshaft pulley) and when your engine gets hot & cuts out, pour cold water over the sensor to cool it down. If the engine then starts straight away the sensor is faulty.

PLEASE READ ALL THIS INFO.

MAKE SURE THE ENGINE OIL IS CLEAN AND CHANGED AT PROPER INTERVALS
P0011 NISSAN - Intake Valve Timing Control Performance Bank 1

Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine lack/loss of power
- Posssible engine rough idle
Possible causes - Harness or connectors
- Intake valve timing control solenoid valve circuit is open or shorted
- Intake valve timing control solenoid valve may be faulty
- Crankshaft position sensor (POS) may be faulty
- Camshaft position sensor
Tech notes Since the Intake valve timing control solenoid valve uses oil flow to control timing, dirty oil can cause the valve to stuck open or close. Before replacing the valve, change engine oil and filter and reset engine code. When is the code detected? When there is a gap between angle of target and phase-control angle degree, the valve will stop working and the ECM will trigger the P0011 code. P0011 NISSAN Description This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve.

The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.

The intake valve timing control solenoid valve changes the oil amount and direction of flow through intake valve timing control unit or stops oil flow. The longer pulse width advances valve angle. The shorter pulse width retards valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position.
MAKE SURE YOUR OIL IS CLEAN AND CHANGED AT PROPER INTERVALS.

Hi, at the front of the crankshaft. if its near time for the timing belt, you want to replace it along with any pullies, tensioner and water pump


The crankshaft position sensor is mounted on the engine near the crankshaft.

Operation

The crankshaft position sensor is a Hall-Effect sensor that senses the crank angle (piston position) of each cylinder and converts it into a pulse signal. The signal from the sensor is relayed to the ECM to indicate engine rpm and the position of the crankshaft.

Removal & Installation

1. Disconnect the negative battery cable.
2. Disconnect the connector from the sensor.
3. Remove the bolt that retains the sensor in place.
4. Remove the sensor from its mounting. To install:
   
   1. Installation is the reverse of the removal procedure.
   2. Clearance between the sensor and the sensor wheel should be 0.020-0.059 inch. 2002-2005
      
      1. Properly connect the scan tool.
      2. Start the engine and allow it to idle.
      3. Be sure the idle position switch is ON.
      4. Specifications are as follows:
         
         Temperature - 4°F, test specification 1500-1700 RPM Temperature 32°F, test specification 1350-1550 RPM Temperature 68°F, test specification 1200-1400 RPMTemperature 104°F, test specification 1000-1200 RPM Temperature 176°F, test specification 650-850 RPM

If you haven't changed your fuel filter, I would start with that. Hopefully your engine didn't jump timing. If you have never had your timing belt changed, you should go ahead and get that changed.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Crankshaft Position Sensor: Service and Repair
Crankshaft Position (CKP) Sensor Replacement
REMOVAL PROCEDURE
IMPORTANT: Care must be taken when removing the crankshaft position (CKP) sensor. Use penetrating oil and allow to soak around the CKP
sensor before removing the sensor. Twist the sensor to break the O-ring seals loose. When removing the sensor, pull the sensor straight out of the
engine block at the same angle the sensor was installed. Failure to be careful may result in sensor damage.
1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Disconnect the crankshaft position (CKP) sensor harness connector at the CKP sensor.
3. Remove the fuel line bracket and retaining bolt.
4. Use penetrating oil and allow to soak around the CKP sensor before removing the sensor.
5. Remove the CKP sensor retaining bolt.
6. Prior to removal of the CKP sensor, rotate the sensor back and forth.
7. Remove the CKP sensor at the same angle at which the CKP sensor was installed.
INSTALLATION PROCEDURE
IMPORTANT: Inspect the CKP sensor O-ring for wear or damage. If a problem is found, replace the O-ring. Lubricate the new O-ring with engine
oil before installing.
1. Install the CKP sensor at the same angle at which the CKP sensor was removed.
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the CKP sensor retaining bolt.
Tighten
Tighten the bolt to 12 N.m (106 lb in).
3. Connect the CKP sensor harness connector.
4. Install the fuel line bracket and retaining bolt.
5. Lower the vehicle.
6. Perform the CKP System Variation Learn Procedure. See: Testing and Inspection/Programming and Relearning



Crankshaft Position Sensor: Service and Repair
CKP System Variation Learn Procedure
IMPORTANT: For additional diagnostic information, refer to DTC P1336.
1. Install a scan tool.
2. With a scan tool, monitor the powertrain control module for DTCs. If other DTCs are set, except DTC P1336, refer to Diagnostic Trouble Code
(DTC) List for the applicable DTC that set.
3. Close the vehicle's hood.
4. With a scan tool, select the crankshaft position variation learn procedure.
5. Observe the fuel cut-off for the engine that you are performing the learn procedure on.
6. The scan tool instructs you to perform the following:
^ Apply the vehicles parking brake.
^ Block the drive wheels.
^ Cycle the ignition from OFF to ON.
^ Apply and hold the brake pedal.
^ Start and idle the engine.
^ Turn OFF the A/C.
^ Place the vehicle's transmission in Park (A/T) or Neutral (M/T).
^ The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only
displays the condition that inhibits the procedure. The scan tool monitors the following components:
- Crankshaft position (CKP) sensors activity - If there is a CKP sensor condition, refer to DTC P0335 or DTC P0336.
- Camshaft position (CMP) sensor activity- If there is a CMP sensor condition, refer to DTC P0341, DTC P0342 or DTC P0343.
- Engine coolant temperature (ECT) - If the engine coolant temperature is not warm enough, idle the engine until the engine coolant
temperature reaches the correct temperature.
7. With the scan tool, enable the crankshaft position system variation learn procedure.
IMPORTANT: 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.
8. Slowly increase the engine speed to the RPM that you observed.
9. Immediately release the throttle when fuel cut-off is reached.
10. The scan tool displays Learn Status: Learned this ignition. If the scan tool does NOT display this message and no additional DTCs set, refer to
Symptoms - Engine Mechanical. If a DTC set, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC that set.
11. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.