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97 Boxster crank no start

Justin Boisclaire
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Ahsai Member

Ahsai

Posted
Posted

No, I meant revert everything back to stock and try to crank. Do not jumper anything. If the car does not even crank, it's likely an immobilizer issue.

 

I've not heard of Durametric rental. There's a thread here where Durametric owners posted that they are willing to help locally.

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JFP in PA
JFP in PA

If you are sure your fuel pump relay is good, and the pump turns on when jumpered, I am back to the immobilizer, which shuts the fuel and ignition off if it fails to see engine rotation.   

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Loren Member

Loren

Posted
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25 minutes ago, Justin Boisclaire said:

So can the DME shut off the CPS signal? I had the car scanned and it has a scary amount of codes which most are DME related.

 

No, the CPS is just a sensor. It sends a signal back to the DME.

mikefocke Member

mikefocke

Posted
Posted

 Those codes are the key and the people who are trying to help you have collectively thousands of Boxsters experience and the manuals to help you if you help them. POST THE CODES.

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JFP in PA Member

JFP in PA

Posted
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2 minutes ago, Justin Boisclaire said:

39 signal converter faulty, 34 passenger compartment short to b+, 47 Central locking synchronization, 23 w lead to DME short to b+, 42 wrong transponder pill, 25 no terminal 86 s recognized.

 

That looks like your central locking/alarm computer is malfunctioning and keeping the car from starting (thinks you are stealing it).  Has this key worked in the past?  If it has, you need to start looking at the control unit under the driver's seat to see if it is wet, has become disconnected, or has its internal fuse blown.

Justin Boisclaire Member

Justin Boisclaire

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  • Author
Posted

39 signal converter faulty, 34 passenger compartment short to b+, 47 Central locking synchronization, 23 w lead to DME short to b+, 42 wrong transponder pill, 25 no terminal 86 s recognized.

 

 

 

 

The car ran fine before the installation of the radio. The buttons on the remote never worked. The module under the seat is dry, the car stays in my shop and never gets driven in the rain.

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JFP in PA Member

JFP in PA

Posted
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Posted
16 minutes ago, Justin Boisclaire said:

39 signal converter faulty, 34 passenger compartment short to b+, 47 Central locking synchronization, 23 w lead to DME short to b+, 42 wrong transponder pill, 25 no terminal 86 s recognized.

 

 

 

 

The car ran fine before the installation of the radio. The buttons on the remote never worked. The module under the seat is dry, the car stays in my shop and never gets driven in the rain.

 

That maybe, but the fault codes say it is the central locking system, you need to figure out what was done during the radio install that upset it.

 

It would also be helpful if you listed the "P" codes as well.

Justin Boisclaire Member

Justin Boisclaire

Posted
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Not sure that we pulled up any p codes. The guy that scanned it has my under seat module and is going to see if he can fix it. All this is over my head, wish i knew more about it tho because of my love for cars.

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JFP in PA Member

JFP in PA

Posted
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1 minute ago, Justin Boisclaire said:

Not sure that we pulled up any p codes. The guy that scanned it has my under seat module and is going to see if he can fix it. All this is over my head, wish i knew more about it tho because of my love for cars.

 

 

Works this way:  When you insert your key into the ignition, a pill in the key is read by the box under the seat, which then sends a code to the DME, allowing the car to start.  If someone tried to hot wire the car, or use a bogus key, no pill, no read, no signal to the DME, car won't fire.

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JFP in PA Member

JFP in PA

Posted
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An additional thought:  There is a small glass fuse in the box under the seat, have your guy check it as if it was blown, the box is dead.

Justin Boisclaire Member

Justin Boisclaire

Posted
  • Author
Posted

Not sure that we pulled up any p codes. The guy that scanned it has my under seat module and is going to see if he can fix it. All this is over my head, wish i knew more about it tho because of my love for cars.

 

 

 

Thanks i will make sure it gets checked.

Would immobilizer cause the car not to see the cps? His scanner did not see any rpms when the car was turning over....

wizard Member

wizard

Posted
Posted

Surely the simplest approach would be to return to the status quo ante i.e. disconnect the stereo system and start again?

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JFP in PA Member

JFP in PA

Posted
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1 hour ago, Justin Boisclaire said:

Well the guy says the immobilizer is working correctly... ecu?

 

Put the immobilizer back into the car and try cranking it while measuring the fuel pressure at the Schrader valve on the fuel rail, and tell us what the fuel pressure reads.

Justin Boisclaire Member

Justin Boisclaire

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I am wondering how to test the new cps and see why I still am not getting any rpm reading when it cranks. I am at the mercy of the experts at this point, i can normally find issues on my own but this one is beyond me now.

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JFP in PA Member

JFP in PA

Posted
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19 minutes ago, Justin Boisclaire said:

The fuel pump does not turn on. I can put 12v to it and it will run. 

 

 

 

 

If you are sure your fuel pump relay is good, and the pump turns on when jumpered, I am back to the immobilizer, which shuts the fuel and ignition off if it fails to see engine rotation. 

 

Do a search here for checking the CPS, there are a couple of simple resistance test you can run.  At room temp the resistance between terminal 1 and 2 should be between 800 and 1000 ohms according to Porsche diagnostic manual.  The full diagnostic should call for removing the DME and check the continuity between pin 1 of sensor and pin 32 of DME, then pin 2 of sensor and pin 46 of the DME. Also check resistance between pins 1&3, then 2&3, of the sensor. They should read infinity. If those check out, replace the sensor.

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ttocs Member

ttocs

Posted
Posted
7 hours ago, wizard said:

"The car ran fine before the installation of the radio"

This may assist in tracking down your issue ...
https://cai-store.com/pages/911-boxster-double-din-conversion

Let me see if I understand the actuation of the anti-theft wire. The Becker radio has a insulated portion of the chassis that rests against the tab that the anti-theft wire is attached to, so if the radio is removed does the tab ground itself causing a radio theft fault? Further, if a new radio is installed with bare metal against this tab, it grounds the tab/anti-theft wire again causing a theft fault to occur?

 

I had mine installed at a place very familiar with Porsches so I wasn't aware of any of this, so this is good info for me to know.

Justin Boisclaire Member

Justin Boisclaire

Posted
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Thankyou for that info on the radio installation, I did follow the instructions and taped off the wire. Hoping to get my alarm module back so i can keep trouble shooting it.... I need to test my new cps sensor and then figure out how to test my DME.

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