HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Need some help with starting the motor

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Re: Need some help with starting the motor

Post  xschop on Tue Jun 21, 2011 10:21 am

I'm lost in you guy's replies, but YOU DO NOT hook the starter to fuze #36
You only hook the PCM relay to fuze #36 as fuze #36 is the SMALLER DIAMETER red/blk wire on the keyswitch and is on 100% of the time when the key is an ANY position other than OFF.

The Main starter wire should come off the LARGER DIAMETER red/blk wire at the keyswitch. (It turns into a Red/Black wire on a seperate 2-pin connector) and that is what I wired my starter wire directly to. It is only on when the keyswitch is in the full-turn position.


Last edited by xschop on Tue Jun 21, 2011 10:29 am; edited 1 time in total
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Re: Need some help with starting the motor

Post  Dawgz83948 on Tue Jun 21, 2011 10:28 am


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Re: Need some help with starting the motor

Post  spence on Tue Jun 21, 2011 10:31 am

I asked him where he got his 12v switched wire from... He seems to have eveything hooked up right; he used the 2 pin connector in the engine bay with the thick red/black wire. Thats where I got mine and my starter works fine

I think it might be related to the 14pin connector / fuel pump relay... He may have hooked into the wrong wire? I don't know... I'm lost, I'm done replying to this... I'm no expert... lol just trying to help
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Re: Need some help with starting the motor

Post  xschop on Tue Jun 21, 2011 10:34 am

Thanks Dawg, I corrected the post. I just hate to see somebody burn their PCM over a mis-wire.
On a side-note #7 pin on the 14-pin connector (Red/Black) also is tied directly to the Starter Switched position. I'm just not sure of the wire size/gauge as the schematic doesn't say. The 2-pin connector (Red/Black) shown by Dawg is THICKER gauge and should be used for the main starter wire.
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Re: Need some help with starting the motor

Post  spence on Tue Jun 21, 2011 10:56 am

AH... I think he should look into pin #7 then.... Hooking the fuel pump relay wire to pin #7 (instead of the fuel pump) would cause the starter to run when the computer is hooked up wouldnt it?
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Re: Need some help with starting the motor

Post  xschop on Tue Jun 21, 2011 10:59 am

scratch

Hey Arthro, are you running the factory PCM relay?
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Re: Need some help with starting the motor

Post  Dawgz83948 on Tue Jun 21, 2011 11:17 am

If everything is hooked up correctly that would be impossible since the solenoid should only have the connection to the ignition switch. So ONLY the ignition switch should start it regardless of the ECU connection.
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Re: Need some help with starting the motor

Post  spence on Tue Jun 21, 2011 11:23 am

Thats why I asked him to double check the 14 pin connector (incase its not hooked up correctly)... This only happens when the ecu is plugged in. If the ecu is sending power to the fuel pump relay which then powers pin 7 instead of the fuel pump; it could be the cause.

Ok now im done... no more replys... I hope you figure it out Arthro! Good luck
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Re: Need some help with starting the motor

Post  Dawgz83948 on Tue Jun 21, 2011 11:26 am

spence wrote:Thats why I asked him to double check the 14 pin connector (incase its not hooked up correctly)... This only happens when the ecu is plugged in. If the ecu is sending power to the fuel pump relay which then powers pin 7 instead of the fuel pump; it could be the cause.

Ok now im done... no more replys... I hope you figure it out Arthro! Good luck

I guess the main thing for him to check is that NONE of the 14 pin wires are going to the solenoid connection on the starter.
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Re: Need some help with starting the motor

Post  Arthropraxis on Tue Jun 21, 2011 1:57 pm

Thanks, for the replies. I will check the 14 pin connector, good idea. I am using a main switched relay getting the switched power from the Porsche fuse #36. The only wires going to the starter from the Porsche system is the thick Red/black wire from the alternator/starter two wire connector on the firewall and the battery wire. It must be with the 14 pin connector or the ignition switch. I will check the 14 pin wiring and try to get it to turn without the ECU hooked up.
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Re: Need some help with starting the motor

Post  Arthropraxis on Tue Jun 21, 2011 2:36 pm

I did have my fuel pump hooked into pin #7 on the mid harness, I must have read that somewhere because I had it in my wiring notes to do that. I moved that from pin #7 to pin #5. I did not hook the PCM back up but tried to start it and it did nothing. That may explain why it would work through the PCM and not the ignition. So, don't sell yourself short Spence and thanks for the help.

I have a part #7 ,in Dawg's diagram, coming from rockauto that has the same part number as the one in the car now. Maybe that will fix it. If I back fed the wiring from my PCM, could that have fried the ignition switch?
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Re: Need some help with starting the motor

Post  spence on Tue Jun 21, 2011 3:47 pm

Thats great... I knew something was up.... I think your ignition switch might be gone too...

I think the fuel pump wire is pin #4 though... It's a green / black wire
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Re: Need some help with starting the motor

Post  spence on Tue Jun 21, 2011 3:49 pm

This is from 944-LT1

1 – GN – To Ignition Coil (Not Used)
2 – RD/BL – To Injectors from DME Relay pin 87 (Not Used)
3 – RD/YL – 12 VDC from DME Relay pin 87 to DME pins 35 and 18
4 – BK/GN – Fuel Pump/O2 Sensor (see notes)
5 – BK/GR – Earth from DME Relay pin 85b to DME pin 20 (see notes)
6 – BL/WT – To G on Oil Pressure Sensor
7 – RD/BK – Ignition Switch and Starter to DME pin 4
8 – BL/YL – To G on Water Temp Sensor
9 – BL – To WK on Oil Pressure Sensor
10 – BL/GN – To W on Water Temp Sensor
11 – (Not Used)
12 – (Not Used)
13 – RD/GN – DME – A/C Compressor (Not Used)
14 – (Not Used)

NOTES:
Pin 4: After the DME relay is energized, +12VDC flows from 87b of the DME relay G5 to fuse 34 and then braches off to the fuel pump and to Pin 4 of the T21 14 pin connector which powers the stock 944 oxygen sensor with +12VDC.
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Re: Need some help with starting the motor

Post  Arthropraxis on Tue Jun 21, 2011 4:57 pm

I will try that then. The manual is apparently wrong, it has #4 as empty/NA and #5 as fuel pump relay.
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Re: Need some help with starting the motor

Post  spence on Wed Jun 22, 2011 10:19 am

Just thought of something.... I'm not sure if theres a fuse for the starter? If there is, you may have blew it... That may be another reason it's not cranking when in "start"
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Re: Need some help with starting the motor

Post  944-LT1 on Wed Jun 22, 2011 10:42 am

If the ignition switch is mechanically faulty, youre gonna see all sorts of weird activity. I have to stress this again and say; Always make note of the custom wiring you are performing. Youll never know when you need to reference it again and theres nothing worse than having to diagnose your own wiring. Laughing

I cannot remember your specifics but on my LS, I made full use of the computers abilities in that the ECU has a crank enable relay wire that once the ECU receives power from the ignition switch, powers the starter relay. Without the ECU, in my case, the starter will not run.

Regardless, install your new ignition switch and start again from there.

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Re: Need some help with starting the motor

Post  Arthropraxis on Wed Jun 22, 2011 8:52 pm

Thanks, everyone for the help. It was the fuel pump wire being in the wrong pin. Now when the ECM is plugged in the ignition switch acts like it should and powers the pump instead of the starter in the first position. It still does nothing in the third position and has no key return spring.
Does the spring back for the key come from the electronic part of the switch or the lock cylinder? This is an 87 Turbo.
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Re: Need some help with starting the motor

Post  Dawgz83948 on Thu Jun 23, 2011 9:32 am

I'll paste in my reply a few posts back:

If your car does not have the start "feel" where it ckicks back and locks out start again, I'm thinking that is related to the electrical part of the ignition since it contains the springs and lockout gears. It's a cheap part (cheap being relative, I guess) that always fails on 944's, although typically not in that way. [You must be registered and logged in to see this link.]
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Re: Need some help with starting the motor

Post  Arthropraxis on Thu Jun 23, 2011 7:34 pm

I have an ignition switch on the way, thanks for the suggestion. I could not wait for it to get here so I jumped the starter ,as Spence suggested, and it fired right up . Then shut off, because the PCM isn't tuned yet. Thanks, for everyone's help.
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FIXED!

Post  Arthropraxis on Sun Jun 26, 2011 7:11 pm

I bypassed the alarm and the ignition switch works fine. I didn't know it was armed, I don't even have the key to turn it on. Now I have a new one on the way that is non returnable, anyone need a new ignition switch?
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