C6 no start after replacing crankshaft position sensor
10-15-2021, 09:22 PM
#1
Racer
Thread Starter
C6 no start after replacing crankshaft position sensor
Hi there fellas tittle says everything...now car doesn't after replacing crankshaft position sensor what can be wrong ?
Another question and I know this has happened to many Vette owners... P0300 can be ...bad coil...spark plugs or wires ... Lose connection?
Another question and I know this has happened to many Vette owners... P0300 can be ...bad coil...spark plugs or wires ... Lose connection?
Last edited by vettelover8306; 10-19-2021 at 12:46 AM.
10-15-2021, 10:15 PM
#2
Race Director
Probably need to do a crank relearn.
10-15-2021, 10:16 PM
#3
Racer
Thread Starter
10-15-2021, 10:21 PM
#4
Racer
Thread Starter
10-15-2021, 11:46 PM
#5
Supporting Vendor
10-15-2021, 11:52 PM
#6
Racer
Thread Starter
10-16-2021, 09:48 AM
#7
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Location: Pearland / Houston Tx
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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:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. 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 system 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
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:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. 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 system 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
10-16-2021, 11:44 AM
#8
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Kind of hard to accelerate to WOT or do any of the learn procedure if the car won't start, or am I missing something here?
10-16-2021, 01:13 PM
#9
Racer
Thread Starter
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:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. 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 system 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
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:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. 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 system 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
10-16-2021, 03:26 PM
#10
Racer
Thread Starter
10-16-2021, 03:27 PM
#11
Racer
Thread Starter
10-16-2021, 08:08 PM
#12
Supporting Vendor
What prompted you to replace it in the first place? They rarely ever fail so if you had a slow starting situation which ended up throwing a crank sensor CEL it's usually the manifestation of a different problem altogether, not from a bad sensor.
This kind of thing happens frequently from a broken post on the starter solenoid or a very weak battery. What'll happen is that the motor turns over very slowly and when the PCM detects this it will trigger the CEL. In more extreme cases (but hopefully not in yours) if an engine turns over slowly when it's hot that could be a sign the motor is about to spin a bearing and eventually seize up.
Good luck with it either way.
Last edited by subfloor@centurytrans; 10-16-2021 at 08:08 PM.
10-16-2021, 08:36 PM
#13
Racer
Thread Starter
What color is it? The one for a 2005 is typically black and the later years are grey.
What prompted you to replace it in the first place? They rarely ever fail so if you had a slow starting situation which ended up throwing a crank sensor CEL it's usually the manifestation of a different problem altogether, not from a bad sensor.
This kind of thing happens frequently from a broken post on the starter solenoid or a very weak battery. What'll happen is that the motor turns over very slowly and when the PCM detects this it will trigger the CEL. In more extreme cases (but hopefully not in yours) if an engine turns over slowly when it's hot that could be a sign the motor is about to spin a bearing and eventually seize up.
Good luck with it either way.
What prompted you to replace it in the first place? They rarely ever fail so if you had a slow starting situation which ended up throwing a crank sensor CEL it's usually the manifestation of a different problem altogether, not from a bad sensor.
This kind of thing happens frequently from a broken post on the starter solenoid or a very weak battery. What'll happen is that the motor turns over very slowly and when the PCM detects this it will trigger the CEL. In more extreme cases (but hopefully not in yours) if an engine turns over slowly when it's hot that could be a sign the motor is about to spin a bearing and eventually seize up.
Good luck with it either way.
10-16-2021, 08:39 PM
#14
Supporting Vendor
10-16-2021, 09:06 PM
#16
Supporting Vendor
10-16-2021, 09:09 PM
#17
Racer
Thread Starter
Reduced engine power while driving and sometimes when get a bump ... service traction control (least common than reduce engine power message ) p0336 code ... Rough starts ... sometimes steering wheel hard to operate
Battery is brand new even with a tough jumper impossible to start the car ...it cranks but won't start and I smell gas everytime I try to start it
Battery is brand new even with a tough jumper impossible to start the car ...it cranks but won't start and I smell gas everytime I try to start it
Last edited by vettelover8306; 10-16-2021 at 09:10 PM.
10-19-2021, 12:34 AM
#18
Racer
Thread Starter
Hey I have to hands down to you...it was a wrong crankshaft sensor i just installed the right one today ...car starts perfect but got now a p0300 code which is misfire ... question is ...can be a bad coil ? Bad spark plugs? Wires? Or even crankshaft sensor need a relearn ? Cause sometimes car starts and idles roughly but when I press gas and start to move it runs smooth ... Also can be a lose spark cable or poorly connected to the coil ?
10-19-2021, 12:00 PM
#19
Supporting Vendor
Hey I have to hands down to you...it was a wrong crankshaft sensor i just installed the right one today ...car starts perfect but got now a p0300 code which is misfire ... question is ...can be a bad coil ? Bad spark plugs? Wires? Or even crankshaft sensor need a relearn ? Cause sometimes car starts and idles roughly but when I press gas and start to move it runs smooth ... Also can be a lose spark cable or poorly connected to the coil ?
I've swapped engines more times than I care to remember so I don't think a crank relearn is necessary.
It definitely wouldn't hurt to examine all the plugs and make sure the wires are on securely, both on the plugs and coils.
If you're able to isolate the misfire to one side or the other then I'd suggest swapping the entire bank of coils to see if the problem moves. If it does then you might have a bad coil, if not then it could be something else that's going on.
Additionally, check the pins on the coil harness connector. I once had a misfire I couldn't track down which ended up being from one of the small pins in the connector. It had gotten pushed pushed down just enough to cause an intermittent problem.
10-19-2021, 12:12 PM
#20
Racer
Thread Starter
Glad I could help.
I've swapped engines more times than I care to remember so I don't think a crank relearn is necessary.
It definitely wouldn't hurt to examine all the plugs and make sure the wires are on securely, both on the plugs and coils.
If you're able to isolate the misfire to one side or the other then I'd suggest swapping the entire bank of coils to see if the problem moves. If it does then you might have a bad coil, if not then it could be something else that's going on.
Additionally, check the pins on the coil harness connector. I once had a misfire I couldn't track down which ended up being from one of the small pins in the connector. It had gotten pushed pushed down just enough to cause an intermittent problem.
I've swapped engines more times than I care to remember so I don't think a crank relearn is necessary.
It definitely wouldn't hurt to examine all the plugs and make sure the wires are on securely, both on the plugs and coils.
If you're able to isolate the misfire to one side or the other then I'd suggest swapping the entire bank of coils to see if the problem moves. If it does then you might have a bad coil, if not then it could be something else that's going on.
Additionally, check the pins on the coil harness connector. I once had a misfire I couldn't track down which ended up being from one of the small pins in the connector. It had gotten pushed pushed down just enough to cause an intermittent problem.