2011 Silverado 5.3 CPK Crankshaft Relearn Procedure

[Sammylove]

I need to perform a CPK relearn on my truck , currently has a p0306 code, Ive replaced plugs,wires,injectors,....I have a Vident iLink400 scanner, Ive went through the steps, not sure if Im doing something wrong or not holding at the WOT long enough, Im just not sure. Do i try to stay @ 4000 rpm's? just under 4000 rpm's? If I reach the cut off and the rpm's start to decrease do I just let off the accelerator and let it idle?Im not seeing it read "test in progress" unless I reach the fuel cutoff mark, Thanks in advance for any help that you guys can give me.

Thx

Sammy

[swathdiver]

18 minutes ago, Sammylove said:

I need to perform a CPK relearn on my truck , currently has a p0306 code, Ive replaced plugs,wires,injectors,....I have a Vident iLink400 scanner, Ive went through the steps, not sure if Im doing something wrong or not holding at the WOT long enough, Im just not sure. Do i try to stay @ 4000 rpm's? just under 4000 rpm's? If I reach the cut off and the rpm's start to decrease do I just let off the accelerator and let it idle?Im not seeing it read "test in progress" unless I reach the fuel cutoff mark, Thanks in advance for any help that you guys can give me.

Thx

Sammy

I have not done it yet with my Tech-2 but this is from the shop manual:

 

Crankshaft Position System Variation Learn
 

1. Install a scan tool.
2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
3. Select the crankshaft position (CKP) variation learn procedure with a scan tool.
4. The scan tool instructs you to perform the following:

1. Accelerate to wide open throttle (WOT).
2. Release throttle when fuel cut-off occurs.
3. Observe fuel cut-off for applicable engine.
4. Engine should not accelerate beyond calibrated RPM value.
5. Release throttle immediately if value is exceeded.
6. Block drive wheels.
7. Set parking brake.
8. DO NOT apply brake pedal.
9. Cycle ignition from OFF to ON.
10. Apply and hold brake pedal.
11. Start and idle engine.
12. Turn A/C OFF.
13. Vehicle must remain in Park or Neutral.
14. 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:

• • 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.

5. 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.
 

6. Accelerate to WOT.
7. Release when the fuel cut-off occurs.
8. Test in progress.
9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP Variation Learn Procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
11. The CKP Variation Learn Procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

• • A CKP sensor replacement
  • An engine replacement
  • A ECM replacement
  • A harmonic balancer replacement
  • A crankshaft replacement
  • Any engine repairs which disturb the CKP sensor relationship

[Jsdirt]

On my Autel, the procedure is over in a matter of seconds. I get the prompt to hold the pedal to the rug, it revs to fuel cut, then says "procedure completed". I let off the pedal as soon as I see the screen change.

[Sammylove]

I held it to the floor, it decelerates @4000 rpm, I release the accelerator, it displays test in progress for a sec, then it reads accelerate to WOT, Release if fuel cut off happens, And I’ve done this about 5 times, still nothing that tells me the test passed/failed, still missing , running rough

[swathdiver]

On 4/23/2020 at 8:06 PM, Sammylove said:

I held it to the floor, it decelerates @4000 rpm, I release the accelerator, it displays test in progress for a sec, then it reads accelerate to WOT, Release if fuel cut off happens, And I’ve done this about 5 times, still nothing that tells me the test passed/failed, still missing , running rough

Any codes still?

[Sammylove]

6 hours ago, swathdiver said:

Any codes still?

Yes, P0300, I’m guessing that the code is what keeps the test from starting the cpk relearn, I’m thinking now it may be something with the fuel delivery, I’ve verified compression is good, fuel pressure is 60 psi with ignition on, after starting it drops to 40psi, I’m waiting on a noid light so I can verify #6 cylinder is pulsing like it should, the injectors are new also, any suggestions?

[Jsdirt]

40 psi will definitely cause an 0300, probably due to a lean miss. I'd take care of that first before doing anything else.

[swathdiver]

3 hours ago, Sammylove said:

Yes, P0300, I’m guessing that the code is what keeps the test from starting the cpk relearn, I’m thinking now it may be something with the fuel delivery, I’ve verified compression is good, fuel pressure is 60 psi with ignition on, after starting it drops to 40psi, I’m waiting on a noid light so I can verify #6 cylinder is pulsing like it should, the injectors are new also, any suggestions?

How are you measuring the fuel pressure?  A FlexFuel engine runs at 43 psi.  The P0300 is a generic misfire code.  I would be looking for misfires on all the cylinders.

[Sammylove]

3 hours ago, swathdiver said:

How are you measuring the fuel pressure?  A FlexFuel engine runs at 43 psi.  The P0300 is a generic misfire code.  I would be looking for misfires on all the cylinders.

 

I put a pressure gauge on the fuel rail, I can see a steady misfire on my scanner on #6 cylinder, I’ve verified all of the coil packs are producing a spark, Actually I don’t know know what the problem could be, all of this started when I started to pass a car and it dropped into passing gear and started missing right then, the idle is rough, 

[swathdiver]

2 hours ago, Sammylove said:

I put a pressure gauge on the fuel rail, I can see a steady misfire on my scanner on #6 cylinder, I’ve verified all of the coil packs are producing a spark, Actually I don’t know know what the problem could be, all of this started when I started to pass a car and it dropped into passing gear and started missing right then, the idle is rough, 

Have you pulled the plug and inspected and the wire?  How about the injector?  Can you turn it off for testing purposes?  How is your oil pressure and that little screen under the oil pressure sensor?  If the oil pressure drops below 22 psi, the lifters cannot unlock properly.  If all that checks out, I would run a compression and or leak down test and then pull the head on that side.

[Jsdirt]

7 hours ago, swathdiver said:

How are you measuring the fuel pressure?  A FlexFuel engine runs at 43 psi.  The P0300 is a generic misfire code.  I would be looking for misfires on all the cylinders.

I thought they were all mid-50's PSI? I'll have to check my '07 - it's a Flex. If it has an easy way to check it.

 

Been hearing all these newer ones require a splice to check. No more schraeders. That was probably to get people used to it, since DI was right around the corner.

 

How much does anyone want to bet this is another AFM failure? #6 is an AFM cylinder. If the fuel pressure checks out, might be time to yank the valve cover and see what the rockers do while it's running.

[swathdiver]

3 hours ago, Jsdirt said:

I thought they were all mid-50's PSI? I'll have to check my '07 - it's a Flex. If it has an easy way to check it.

 

Been hearing all these newer ones require a splice to check. No more schraeders. That was probably to get people used to it, since DI was right around the corner.

 

How much does anyone want to bet this is another AFM failure? #6 is an AFM cylinder. If the fuel pressure checks out, might be time to yank the valve cover and see what the rockers do while it's running.

Mine has always been 43.5 psi.  That's the commanded and actual pressure while running whether at idle or WOT.

 

I'm beginning to suspect a lifter or piston too.

[Jsdirt]

One thing about this industry, especially today, is you never stop learning! Thanks for the info, James. 

[tlaw91]

lifter time


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