How do you do it? I think I've narrowed it down to this. I've got spark and fuel, but it won't start and I have a code p0336. Anyone know how to check to see if the sensor is operating correctly? Thanks in advance.

Jon

 

Graphing scantool or an oscilloscope will let you see the crank signal

 

http://www.gearchatter.com/viewtopic10222.php

 

If this fault showed up on it's own then you probably need to replac e the sensor, you shouldn't have to do a relearn but if you need to then you'll have to have a tech II to do it.

 

From GM SI on the web:
Crankshaft Position System Variation Learn
Install a scan tool.
Monitor the powertrain control module for DTCs with a scan tool. If other DTCs are set, except DTC P1336, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC that set.
Select the crankshaft position (CKP) variation learn procedure with a scan tool.
The scan tool instructs you to perform the following:
• Accelerate to wide open throttle (WOT).

• Release and observe the fuel cut-off for the engine that you are performing the learn procedure on.

• Engine should not accelerate beyond calibrated RPM value.

• Release throttle immediately if value is exceeded.

• Block drive wheels.

• Set parking brake.

• DO NOT apply brake pedal.

• Cycle the ignition from OFF to ON.

• Apply and hold the brake pedal.

• Start and idle engine.

• Turn A/C OFF.

• Vehicle must remain in Park or Neutral.

• 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 the applicable DTC that set.

- Camshaft position (CMP) sensor activity--If there is a CMP sensor condition, refer to the applicable DTC that set.

- Engine coolant temperature (ECT)--If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.

Enable the CKP system variation learn procedure with a scan tool.
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.

Accelerate to WOT.
Release when the fuel cut-off occurs.
The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P1336 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P1336 failed or did not run, refer to DTC P1336 . If any other DTCs 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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Document ID# 851533
2003 Chevrolet Corvette

 

Here is info on P0336
DTC P0336
Circuit Description
The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor is connected directly to the powertrain control module (PCM) and consists of the following circuits:

• The 12-volt reference circuit

• The low reference circuit

• The CKP sensor signal circuit

If the PCM detects that the CKP sensor is inconsistent for less than 2 seconds.

Conditions for Running the DTC
The engine is cranking or running.

Conditions for Setting the DTC
The PCM determines that the CKP sensor signal is for less than 2 seconds.

Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

• Clear the MIL and the DTC with a scan tool.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

This step tests for electromagnetic interference (EMI) on the CKP sensor circuits.

Vertical lines across the face of the sensor may indicate foreign material passing between the CKP sensor and the reluctor wheel. Lines which are not vertical across the face of the sensor may indicate a crack in the CKP sensor. Either of these conditions will cause this DTC to set.

Damage to the reluctor wheel can affect the CKP sensor output.

Step
Action
Yes
No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views

1
Did you perform the Diagnostic System Check-Engine Controls?
Go to Step 2
Go to Diagnostic System Check - Engine Controls

2
Important: Before proceeding with this DTC, diagnose DTC P0335, if active.


Observe the Freeze Frame/Failure records data for this DTC.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?
Go to Step 3
Go to Intermittent Conditions

3
Inspect the CKP sensor for circuit harnesses and for wires that are routed too close to the following components:
- The wires to other components, or the secondary ignition wires

- Aftermarket add-on electrical equipment

- The solenoids

- The relays

- The motors

Inspect for incorrect harness routing.
Did you find and correct the condition?
Go to Step 9
Go to Step 4

4
Test for poor connections at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?
Go to Step 9
Go to Step 5

5
Test for poor connections at the PCM for the CKP sensor circuits, refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?
Go to Step 9
Go to Step 6

6
Remove the CKP sensor. Refer to Crankshaft Position (CKP) Sensor Replacement .
Inspect the CKP sensor for the following conditions:
- Excessive air gap between the CKP sensor and the reluctor wheel

- Foreign material passing between the CKP sensor and the reluctor wheel

- Physical damage

- Improper installation

- Electromagnetic interference in the CKP sensor circuits

Did you find and correct the condition?
Go to Step 9
Go to Step 7

7
Inspect the CKP reluctor wheel for the following conditions:

• Physical damage

• Improper installation

• Excessive endplay or looseness

Refer to Crankshaft and Bearings Removal in Engine Mechanical.

Did you find and correct the condition?
Go to Step 9
Go to Step 8

8
Replace the CKP sensor. Refer to Crankshaft Position (CKP) Sensor Replacement .

Did you find and correct the condition?
Go to Step 9
--

9
Clear the DTCs with a scan tool.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
Go to Step 2
Go to Step 10

10
Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?
Go to Diagnostic Trouble Code (DTC) List
System OK



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Document ID# 851522
2003 Chevrolet Corvette

 

If it wont start most of the above procedures are NA.

 

P0336 is Crankshaft Position (CKP) Sensor A Performance according to EFILive. It can do a CASE relearn also. Usually you only have to do this if you've replaced the PCM, or the sensor is bad. I would check that it's plugged in, then the wires are ok and if so, change it. I'm not aware of anything you've done prior to this problem arising, so you may just want to get a new sensor.
BTW, if ANY of these codes are set: P0335, P0336, P0341, P0342, P0343, P0117, P0118, P1539, P1546, P0705, P0706, P1810, P1825, the CKP learn procedure will not run.

 

Thanks for all the help guys, I have a new sensor coming. It definately seems like the sensor is the problem. It will crank and crank and crank without firing, but sometimes it will barely fire and I can get it running albeit poorly. It will cut out, hesitate, backfire, and die. The plugs are so flooded with gas, I need to change them. Its just so frustrating, I have good fuel pressure, and I verified I'm getting spark by taking a plug out and leaving it attached to the wire and cranking it over.

 

Whatever came of this.My car is doing the same thing.

 

I put in the new crank sensor and it fired right up perfectly. Good luck!