03 town car w/dtc p1336 had ckp/cam sensor, pugs

is spark dead (tested) on all cylinders/?? if not you be barking up the wrong tree. (for sure)
no turbo charged, 3.8L V6 right?

USA car, yes?
the CMP cam sensor kills spark DEAD TOO, so why pick CKP?
then scan the PCM for CKP errors P03xx
same answer all cars USA, 1996 up, OBD2 PCM
here is are the steps.
1: scan tool connected. to cars DLC jack 16pin,
pin 16 must have 12vdc key or the fuse to it is blown!!!
2: key on , see scan tool work now and shows talking ok (communicating)'' can even see stored errors (DTC) last run.

3: crank the engine for 10 seconds, or 10 turns of crank shaft. actual.
4: release the key (not off)let the spring push the key back.
5: do not turn off the key even wait here 1 full minute or more
6: scan PCM AGAIN AND SEE THE p03XX CODES, IF YES BINGO
all usa cars same answer, 1996 up is fed mandated OBD2 .
7: the test beside PCM scans above is using a scope to see the output live.

the CKP is 4 pins HALL sensor know for super good signals all the time. (unlike 2 pin mag type)
related.
DTC P1336 (learning ckp failed)
DTC P0336(ckp errors)
DTC P0336
and more codcs for CAM sensor and if cam drive is loose.

all this and more is in the factory service manual./
now where is it, the CKP hunts endless on endless forums
now I will paste the manuals instruction (removal) verbatim.

1. Disconnect the negative battery cable.
2. Remove the serpentine belt(s) from the crankshaft pulley.
3. Raise the vehicle on a hoist.
4. Remove the right front wheel and tire assembly.
5. Remove the right inner fender access cover.
6. Hold the flywheel with J 37096 Flywheel Holding Tool.
7. Using 28 mm socket, remove the crankshaft harmonic balancer retaining bolt.
8. Remove the crankshaft harmonic balancer using special tool J 38197 Balancer Remover.
9. Remove the crankshaft position sensor shield (do not use a pry bar).
10. Disconnect the sensor electrical connector.
11. Remove 2 attaching bolts from the crankshaft position sensor.
12. Remove the crankshaft position sensor from block face"

end Easter Egg hunt 10000000

The first thing you probably should do is get a copy of the shop manual for your year and model. The manual would have the actual test procedures for the code.
You probably know code 1336 means the signal from the cam and crank sensors is not aligned, meaning the cam timing is off as far as the engine computer can see.
It could have been one of the sensors, but you normally get another code for that sensor too. It could also be a timing chain problem, or a wiring problem going back to the computer.

crank / cam sensor faulty

Trouble Code: P1336

CKP Sensor System Variation Not Learned
Possible Causes:


Set the parking brake and block the drive wheels for safety. Verify the hood is closed. Read the trouble codes. If a code is set, refer to that code. Start the engine. Allow engine temperature to reach at least 158?F (70?C). Then key off. Select Crankshaft Position Variation Learn procedure on Scan Tool & start the vehicle. Apply the brake pedal firmly and verify the selector is in Park. Increase accelerator pedal position until fuel cutoff is reached at the test rpm (e.g., 5150). Quickly release the accelerator pedal after fuel cutoff is reached. The CKP system variation compensating values are learned when the engine speed (rpm) decreases back to idle speed and the procedure terminates. Read the trouble codes and recheck for DTC P1336. If DTC P1336 runs and passes, the CKP system variation "learn" procedure is complete. If not, look for other codes. If no codes are set, repeat the test procedure.

If this is a P1336 read on.
P1336 - Crank / Cam Sensor Range / Performance
Possible causes

Damaged PCM.

Damaged CKP sensor. (crankshaft position sensor)

Damaged CMP sensor. (camshaft position sensor)

Base engine concerns.

Wiring Harness Concerns.

Do you have code P1336 and poor driveability (ie misfires, surging like the trans is drpopping in and out of overdrive). if so you may need to relearn the pcm?
Did you by any chance change the plugs and wires, did you also replace the coil? Also, did you bump or pull the connector for the camshaft postion sensor? Could be it's just coincodence and the sensor just went. Not 100% sure, but I beleive that the cam sensor is used in a sequential fuel injection system to tell the ECU when to turn on an individual fuel injector. If the ECU doesn't detect a signal from the cam sensor, it will default to a batch fire mode, where all 3 injectors on either side of the engine will fire simultaneously causing misfires?
If you can't reprogram the ecu replace the camshaft sensor.

The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the CKP sensors. The calculated error allows the powertrain control module (PCM) to accurately compensate for reference period variations. This enhances the ability of the PCM to detect misfire events over a wider range of engine speed and load.

The code P1336 is for a Crankshaft (CKP) and/or Camshaft (CMP) position sensor input signal to PCM concert. It is triggered if the input signal to the PCM for either of these sensors is erratic. Per the factory service manual, this can be due to:
- a damaged PCM
- damaged CKP sensor
- damaged CMP sensor
- base engine
- harness concerns.

The service manual suggests checking the following items:
- harness routings,
- alterations,
- improper shielding,
- or electrical interference from other improperly functioning systems.

To properly check the operation of the CMP and CKP, you'll really need an oscilloscope. The code is probably being triggered due to a faulty sensor or connection and not something that just needs to be reset.

Step / Action / Yes / No

1. Did you perform the Diagnostic System Check-Engine Controls?
Yes: Go to Step 2
No: Go to Diagnostic System Check - Engine Controls

2. Preform the CKP system variation learn procedure. Refer to CKP System Variation Learn Procedure. Did you complete the action?
Yes: Go to Step 3
No: Go to Diagnostic Aids

3. Clear the DTCs with a scan tool.
Turn OFF the ignition.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC run and pass?
Yes: Go to Step 4
No: Go to Step 2

4. With a scan tool observe the stored information, Capture Info.
Does the DTC run and pass?
Yes: Go to Diagnostic Trouble Code (DTC) List
No: System OK


Diagnostic Aids:
The CKP system variation values are not stored in the PCM memory after a learn procedure has been performed. If the actual CKP variation is not within the CKP system variation compensating values stored in the PCM, DTC P0300 may set.

The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P1336 is set.
An engine replacement
A PCM replacement
A harmonic balancer replacement
A crankshaft replacement
Any engine repairs which disturb the CKP sensor relationship

If the CKP system variation learn procedure cannot be performed successfully, check for the following conditions and correct as necessary:
A damaged reluctor wheel
Excessive crankshaft runout
A damaged crankshaft
Interference in the signal circuit of the CKP sensor
A coolant temperature that is not within the Conditions For Running the DTC
The ignition switch is in the ON position until the battery is drained
A PCM power disconnect with the ignition ON may erase the stored value and set the DTC P1336

Hope helps.

This is from updated GM service manual of mine.

According to the GM factory service manual, the OBD-II trouble code, P1336, is defined as follows: DTC P1336 CKP System Variation Not Learned. The factory service manual does not enumerate all of the symptoms of this trouble code, but after consulting a professional custom PCM tuner, it was learned that aside from the annoying light on the instrument cluster, the other symptoms exhibited may include: poor vehicle performance, and loss of misfire detection diagnostics.

This DTC is particularly nasty, because simply clearing it by disconnecting the battery, or clearing it using an OBD-II scan tool will not address the problem. The code will be set again later unless the vehicle is run through the actual "crank relearn" procedure.

Fixing the Dreaded P1336 DTC

There is only one way to properly fix the P1336 DTC, and that's to perform a "crank relearn" procedure, or as the GM factory service manual procedure calls it, the CKP System Variation Learn Procedure. This procedure can be initiated and performed by GM's be-all end-all scan tool, the Tech-2. It can also be performed by some aftermarket scan tools. Furthermore, some of the PCM tuning software applications are capable of initiating a "crank relearn" procedure.

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.

I would think it would be just the Camshaft Position Sensor.I looked up the codes and they say pretty much the samething.


P0340 Ford Camshaft Position Sensor Circuit Malfunction


P1336 Ford Crankshaft/Camshaft Sensor Range/Performance