PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

car will not start

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Old Aug 21, 2012 | 07:30 PM
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Default car will not start

Last year while driving the car it died an would not start, figured i spund a bearing because oil pressure was at 0, now motors all built, go to turn it over im getting no spark.>


Checked-
Fuses
Relays
Pin outs on harness
Swaped a ecu to see if mine went


Tested the crank sensor with a meter, its not getting any power.


I got nothing, im lost on what to do next.
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Old Aug 22, 2012 | 02:39 PM
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Anyone?
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Old Aug 22, 2012 | 04:03 PM
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As always seems to come up: Check the ground on the rear of the driver-side cylinder head. You would not believe how many times this gets missed. Other than that, get a wiring schematic, and start tracing every wire and verifying voltage (where applicable) and continuity. There's really not going to be any "short cuts" on this....you need to continue working the normal process of elimination.
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Old Aug 22, 2012 | 04:06 PM
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I would start with the wires running from the pcm to the crank sensor. They are easily burned by headers/exhaust.
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Old Aug 22, 2012 | 04:24 PM
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Checked them no breaks or cuts, its geting grounded just no signal or 12v

Back of the head grounds are on tight
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Old Aug 24, 2012 | 04:57 AM
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Looking at the bcm, 1 of the 5 relays wasnt clicking on.

Looked close and saw a crack on the 'T' . Fixed that and still nothing.

I think my bcm is shot?
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Old Aug 25, 2012 | 03:02 PM
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What ignition control, controls the cam sensor, crank sensor an injector pulse?
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Old Aug 25, 2012 | 03:17 PM
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does it turn over with the key?? or just nothing?? have you tried bypassing the ignition and jumping the starter??? basically hot wiring the car? thatll tell you if the BCM is shot
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Old Aug 25, 2012 | 03:31 PM
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Do you get a check engine light with the key on? Plug a scanner in and see if you can communicate with the pcm. On some cars the fuel pump fuse also powered the pcm.

Find someone who can actually diagnose and stop throwing money at it.
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Old Aug 25, 2012 | 07:53 PM
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No codes are being thrown.

If i hot wire it, it wont die in 3-5 seconds? Cuz this is a new engine that needs the ring set

Is there any other way to check if my bcm is shot?
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Old Aug 25, 2012 | 08:49 PM
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Any rpm on the scanner when cranking?
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Old Aug 25, 2012 | 09:44 PM
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No signal,

Every sensor is getting power but injectors, cam, crank.

I looked at my wire harness. Its near my charge pipe but i dont think any wires melted.

Someone told me to track back the wires for. Ign 1 2 or 3. Because one of those control the cam crank n injectors
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Old Aug 26, 2012 | 06:57 AM
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Now we're getting somewhere.






Last edited by Monzsta; Aug 26, 2012 at 07:04 AM.
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Old Aug 26, 2012 | 07:32 AM
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Cant i do a continuity test to the wires from the fuse block to the connectors on the passenger fender?
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Old Aug 26, 2012 | 07:37 AM
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Yes. If the circuits you are testing run through there.
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Old Aug 26, 2012 | 09:00 AM
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Also i needa check if my bcm is fixed after i soldered it, if that one relay on it isnt working could that be my problem?
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Old Aug 27, 2012 | 11:29 AM
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Im about to give up or drop it at a shop
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Old Aug 28, 2012 | 03:01 PM
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So i was looking at a fusible link an its onsulation is blistered.

Think i found my problem
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