2008 Malibu wakesetter 23 lsv crank sensor spn636cm fault

[Blowncoupe]

Just bought this boat and took it out for the first time today and it ran good but then started running like it was missing in a cylinder. The Malibu dealer we bought it from had just replaced the crank sensor and assured us it was in good running condition. I heard there could be other issues causing the crank sensor fault. Curious if anyone else has experienced this?

[Eagleboy99]

That is  a solid crank position sensor fault.  The ECM does not detect a signal from the CKP sensor for greater than 125 mS.  Back to the dealer she goes! 

 

Edited April 3, 2021 by Eagleboy99

[Blowncoupe]

So what does a person do to fix this? The dealer is 6 hrs away so if I can do it myself It would save me a 

long expensive trip. If I need to by the diacom software I will.

thanks

[Eagleboy99]

I think the Diacom software/HW is pretty pricey.

 

Your error could be from:

• Physical damage to the CKP sensor or the reluctor wheel

• Excessive play or looseness of the CKP sensor or the reluctor wheel

• Improper installation of the CKP sensor or the reluctor wheel

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

• Excessive air gap between the CKP sensor and the reluctor wheel

• An intermittent condition with the CMP sensor or circuits

Assuming there is not a hidden code or ECM issue, the diagnosis is via:

1. Ignition OFF, disconnect the harness connector at the CKP sensor.

2. Test for less than 5 Ω between the low reference circuit terminal B and ground. ⇒ If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8–5.2 V between the 5-volt reference circuit terminal C and ground. ⇒ If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. ⇒ If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Test for 4.8–5.2 V between the signal circuit terminal A and ground. ⇒ If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. ⇒ If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. If all circuits test normal, test or replace the CKP sensor

[Blowncoupe]

Well both the ecm and eke sensor have been replaced with only 4 hours on both by a Malibu dealership. I noticed the pigtail had been replaced going to the ekp sensor as well. But I will try to do the test and see what I come up with 

 

[Eagleboy99]

Try section 9-103 here: https://cdn.shopify.com/s/files/1/0106/9702/files/Indmar_Engine_Service_Manual.pdf

[Blowncoupe]

Do you have a wiring diagram so I know which pin is witch

[Blowncoupe]

Thanks eagleboy99 for you help I really appreciate it

[Eagleboy99]

20 minutes ago, Blowncoupe said:

Do you have a wiring diagram so I know which pin is witch

AFAIK, they are not available. I've posted the MC wiring diagrams but I do not know if that would help, even it is an Indmar engine.