CRANK NO START QUESTIONS
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5th Wheeling
Joined: Apr 2011
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CRANK NO START QUESTIONS
Hotshot
Joined: Jul 2020
Posts: 10,471
Likes: 2,633
From: Near Salt Lake City
Well, there is no power going to the CKP
it's a magnetic pickup type sensor that puts out DC voltage (millivolts) with a glitch in the matrix where the tooth is missing
Some of the fancier ones they call a hall effect sensor and they put out a square sine wave. Both about the same no power in
If you have a code for the CKP or CMP's replace them
There are pinpoint tests for the codes you could do first
it's a magnetic pickup type sensor that puts out DC voltage (millivolts) with a glitch in the matrix where the tooth is missing
Some of the fancier ones they call a hall effect sensor and they put out a square sine wave. Both about the same no power in
If you have a code for the CKP or CMP's replace them
There are pinpoint tests for the codes you could do first
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5th Wheeling
Joined: Apr 2011
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THE ONLY CODE IS A PO125 THAT I DON'T THINK IS CONNECTED TO THE PROBLEM. tHE VAN RAN FINE 2 HRS EARLIER THEN CRANK NO START. SINCE THERE IS NO POWER TO THE CKP COULD THE PCM HAVE TAKEN A CRAP?? AND IS THERE A WAY TO TEST IT?? BILLYBOB
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Joined: Jul 2020
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From: Near Salt Lake City
Yes, The scan tool should be able to read the CKP pid but if no code then why?
Have you checked the fuel pressure?
What makes you want to check the CKP?
You should check a few pids if you have access to a capable scan tool
That P0125 is just coolant not up to temp. It needs a thermostat most likely
That could have fouled your plugs if you let it
Have you tried to start it with your foot to the floor?
Check your fuel pressure
Have you checked the fuel pressure?
What makes you want to check the CKP?
You should check a few pids if you have access to a capable scan tool
That P0125 is just coolant not up to temp. It needs a thermostat most likely
That could have fouled your plugs if you let it
Have you tried to start it with your foot to the floor?
Check your fuel pressure
Laughing Gas
Joined: May 2021
Posts: 1,163
Likes: 360
From: Anderson, California
Yes, The scan tool should be able to read the CKP pid but if no code then why?
Have you checked the fuel pressure?
What makes you want to check the CKP?
You should check a few pids if you have access to a capable scan tool
That P0125 is just coolant not up to temp. It needs a thermostat most likely
That could have fouled your plugs if you let it
Have you tried to start it with your foot to the floor?
Check your fuel pressure
Have you checked the fuel pressure?
What makes you want to check the CKP?
You should check a few pids if you have access to a capable scan tool
That P0125 is just coolant not up to temp. It needs a thermostat most likely
That could have fouled your plugs if you let it
Have you tried to start it with your foot to the floor?
Check your fuel pressure
I wonder if your engine has an ignition excitor, which could possibly go bad. When a Honda exciter goes bad it is done.
I would check to see if your engine will start by spraying carb cleaner into an intake manifold vacuum port to check for spark.
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5th Wheeling
Joined: Apr 2011
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Thanks for your reply. I suspected the CKP because without it working you would have no fuel or spark. Since there is no voltage present to the CKP connector with key on, that increased my suspicion. The van was running fine with only P0125 as the only code showing on the OBDII scan tool when the engine was shut off. I can hear the fuel pump running for a short time when the ignition is first turned on so if it's not getting fuel then the PCM is not telling the injectors to go either. I am not an expert just back yard mechanic, so That is my best guess. I'm 74 and a 6 volt guy living in a 12 volt world. Any other conjecture would be interesting. Thanks for all or any help. Bill
Hotshot
Joined: Jul 2020
Posts: 10,471
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From: Near Salt Lake City
Well, if you can hear the fuel pump running that is a good sign
It may not be building pressure though (sometimes the little hose between the pump and sender tube ruptures)
Check the pressure
Have you tried the flood clear start procedure (holding the gas pedal to the floor) to start it?
Research noid light then just use a test light to check for blinking voltage at the injectors in crank
Pull a easy to get to coil out and check for spark. You will need to ground the plug
Good luck
It may not be building pressure though (sometimes the little hose between the pump and sender tube ruptures)
Check the pressure
Have you tried the flood clear start procedure (holding the gas pedal to the floor) to start it?
Research noid light then just use a test light to check for blinking voltage at the injectors in crank
Pull a easy to get to coil out and check for spark. You will need to ground the plug
Good luck
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5th Wheeling
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Evidently you don't think that the lack of 12v reference voltage at the CKP is a concern, why is that?
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Joined: Jul 2020
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From: Near Salt Lake City
Vref only hits a few sensors like the tp and the evr, evp
And vref is only 5.5 volts
So that is why I was wondering the same thing
Why you be looking for 12volts when there is not even 5,5 volts being supplied?
And vref is only 5.5 volts
So that is why I was wondering the same thing
Why you be looking for 12volts when there is not even 5,5 volts being supplied?
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5th Wheeling
Joined: Apr 2011
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Thank you for your reply. The reason was that my Haynes manual and other FTE replies stated that there should be battery voltage at the connector. This is the only reason I suspected the CKP or the PCM. Bill
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