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LS3 crate motor will not start

52Chev

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I am thinking it matches the ECU. I think I saw 58 tooth.
 

52Chev

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Scantool gives rpm, TPS, MAF temp, temp. Pump has 60psi waiting at the injectors. No error codes. Checked pulse at injectors with multimeter and the earth signal does change. Checked a lot of wiring today for continuity. No faults. Checked earths everywhere, ECU, coils etc, all perfect. Sorry for being vague but I am at a loss as well. Any help is much appreciated ari666. Is it easy to work out the ignition state as I think this is where my issue is. It seems to have everything available but just will not start?
 

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That seems to be where my problem is but I had a bloke hook up his computer and the antitheft does not even show up. It has been totally removed?
 

ari666

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it cant really be "totally removed" just switched off.

vats.jpg

in HP_tuners it a simple dropdown menu, select "none", save the file then load it to the PCM. if either "serial" or "pwn" are selected, then the PCM will wait for a signal from either before allowing the car to start.

the holden style serial can be bypassed by using resistors and finiding the right resistance, but there are 15 different resistance ratings to try:
1———— 0.402
2———— 0.523
3———— 0.681
4————-0.887
5————-1.130
6————-1.470
7————-1.870
8————-2.370
9————-3.010
10————3.740
11————4.750
12————6.040
13————7.500
14————9.530
15————11.801

so its a fair whack of flaffing around. much easier to get it hooked up with a tech 2, efi-live or hptuners.
 

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07GTS

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if it were the security would it not crank at all tho..? usually just turn the key and nothing happens, just checked mine in hptuners and i dont have any security (vats) at all that i can see, might depend on the ecu used
 

ari666

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hmmm thats a good point.

i dont think so, cos' the starter circuit doesnt run through the PCM. id guess on a 52' he'd have a seperate circuit key/relay/starter.

edit*

Each VATS key has it’s own unique cuts on the key to operate the lock. but the cuts alone will not allow the car to crank. This is called a mechanical key. Each car has a VATS module (Brain) under the dash that communicates to the starter, fuel pump, and the ignition lock. Each VATS module is randomly given a # (value) from the manufacturer. When the proper mechanical keys, along with the proper VATS chip (resistor value) turns the ignition lock, the VATS module reads the chip on the key . If it is the correct chip, the VATS module will tell the starter and the fuel pump to operate. If the wrong chip is read, the VATS module will tell the starter and the fuel pump to shut down

hmmmm, as he is getting fuel pressure then yeah, maybe its not VATS at all :(
 
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