Challenger rpm

[fredm21]

Hey guys! On my 97 challenger 787 i am trying to get my rpm to work. Does anyone know where the rpm sensor is? And how can I test it? Thank you

 

[fredm21]

Anyone has the answer?

 

[USAF_Pride]

You need to get a copy of the shop manual. Either become a premium member here or try googling "97 challenger shop manual".

That being said, I believe it comes from the MPEM via the ignition coils

 

[LouDoo]

You'll need to verify this because I don't have a wiring diagram for your boat, but on a similar ski (97GSX), it comes off the MPEM, the wire colors are TA-BK, and GY.

Lou

 

[jhjesse]

Have you checked the small paddle wheel mounted on the ride plate to be sure it is freely spinning?

 

[USAF_Pride]

Have you checked the small paddle wheel mounted on the ride plate to be sure it is freely spinning?

That would be the speed sensor.

 

[fredm21]

So i would have to change my MPEM?

 

[fredm21]

The wiring is good, I checked it

 

[LouDoo]

I would suspect the gauge is bad before the MPEM.

Lou

 

[fredm21]

Yeah, and might be cheaper? Can I somehow test this gauge or it's a guess and buy and try

 

[jhjesse]

That would be the speed sensor.

Just a thought,
Try putting a volt meter on the speedo and have someone spin the paddle wheel. If no reading then the sensor/wire is probably bad. If you get a volt reading then speedo is bad.

 

[USAF_Pride]

Just a thought,
Try putting a volt meter on the speedo and have someone spin the paddle wheel. If no reading then the sensor/wire is probably bad. If you get a volt reading then speedo is bad.

His problem is the tach, not the speed.


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[fredm21]

My speed sensor is fine, i changed it last week, now my problem is the rpm

 

[fredm21]

I would like to know if there is a way to test the gauge?

 

[texas114]

i have a detailed wiring diagram for a 1800 challenger 97 model if that will help you out? yes you can test the gauges. I have a detailed procedure that I found that you can try.

 

[fredm21]

Could you tell me how to test it please?

 

[texas114]

check your messages.

 

[fredm21]

Thank you texas!!!

 

[texas114]

no problem

 

[jhjesse]

His problem is the tach, not the speed.

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Well damn, I guess I need to get my glasses checked. Wow missed that one. :facepalm: