2005 Ford Freestar Logo
Anonymous Posted on May 05, 2011

Engin light is on when i check it by computer it gives me error P1336 [25,10,13,36] , please refer to relevant terchnical manual

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  • Ford Master 17,989 Answers
  • Posted on May 05, 2011
ZJ Limited
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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.

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