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VATS question

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Old Apr 15, 2009 | 05:59 PM
  #1  
johnrstuch's Avatar
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From: Jacksonville,FL
Car: 89 Trans am GTA
Engine: 350
Transmission: 700R4
Axle/Gears: not sure
VATS question

on my 89 trans am the security light comes on , then goes
out but then will not crank over with the key(i have a 30 amp
starter button installed to crank it over)i am under the impression
that i should hear a solenoid click inside the car to engage the
starting circuit. but nwhen i crank the engine over with the button
and the key turned on i do have an injector pulse.
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Old Apr 15, 2009 | 06:14 PM
  #2  
tony_cogliandro's Avatar
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From: sunny so cal.
Car: 1990
Engine: 305
Transmission: 700r4
Axle/Gears: stock
Re: VATS question

your vats module and your key are different. if they do not match up then you have a 4 minute wait between tries. if they are the same then your reader for the key is probably bad or maybe your vats module is bad. you just need to get them both at the same time. when you order a new vats they usually send you a new key with it.
pulling the vats module will not help - your ecm is asking if they match and if it does not get a match signal it will not start. no signal is the same as a no match signal.
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Old Apr 19, 2009 | 09:09 AM
  #3  
vetteoz's Avatar
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: VATS question

Originally Posted by johnrstuch
will not crank over with the key turned on i do have an injector pulse
If you have injector pulse then the VATS module is working correctly as far as seeing the correct key resistance.[VATS controls starter and injector pulse]

It then comes down to a fault in the starter solenoid wiring circuit.
Could be VATS module not giving enable signal to the starter enable relay
The starter enable relay itself
or the inhibitor switch at the base of the shifter .
The enable relay can be bypassed ( thick yellow to thick green) leaving only the inhibitor switch in the circuit which can also be bypassed leaving nothing in the circuit between key and starter.
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Old Apr 20, 2009 | 09:15 PM
  #4  
johnrstuch's Avatar
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From: Jacksonville,FL
Car: 89 Trans am GTA
Engine: 350
Transmission: 700R4
Axle/Gears: not sure
Re: VATS question

Originally Posted by vetteoz
If you have injector pulse then the VATS module is working correctly as far as seeing the correct key resistance.[VATS controls starter and injector pulse]

It then comes down to a fault in the starter solenoid wiring circuit.
Could be VATS module not giving enable signal to the starter enable relay
The starter enable relay itself
or the inhibitor switch at the base of the shifter .
The enable relay can be bypassed ( thick yellow to thick green) leaving only the inhibitor switch in the circuit which can also be bypassed leaving nothing in the circuit between key and starter.
well i got the no-crank problem fixed,it turns out that the car had an alarm installed in it with a starter kill solenoid. the alarm was not being used when i bought the car.
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Old Apr 20, 2009 | 09:26 PM
  #5  
marine68's Avatar
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From: SAN ANTONIO TEXAS
Car: 89 IROC Z28
Engine: 5.7 L Edelbrock perf /holley 3310
Transmission: 700R4
Axle/Gears: BW 9 BOLT 3:27
Re: VATS question

what wires do you deal with and what do you do with this inhibitor circuit
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Old Apr 21, 2009 | 04:53 PM
  #6  
johnrstuch's Avatar
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From: Jacksonville,FL
Car: 89 Trans am GTA
Engine: 350
Transmission: 700R4
Axle/Gears: not sure
Re: VATS question

Originally Posted by marine68
what wires do you deal with and what do you do with this inhibitor circuit
the yellow wire, it had been cut ruight in half and a relay spliced inlign so,i cut out the relay and solder the wires back together

Last edited by johnrstuch; Apr 21, 2009 at 07:53 PM.
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Old Apr 21, 2009 | 07:46 PM
  #7  
johnrstuch's Avatar
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Joined: Apr 2009
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From: Jacksonville,FL
Car: 89 Trans am GTA
Engine: 350
Transmission: 700R4
Axle/Gears: not sure
Re: VATS question

Originally Posted by johnrstuch
the yellow wire,i cut out the relay and solder the wires back together
Okay now i am confused.
if i try to start the car with the key,but not on the battery charger,it
don't start,but it wil start with the starter button that was already in the car. now if i put it on the battery charger it will start just fine with the key,vats module and all.
I load tested the battery and it seems to be fine.
The battery is a 550 cold cranking amp,and the battery came out of a cavalier.
So my question is, is the problem that i am having because that the battery is too small to power up the computer,or something?

Last edited by johnrstuch; Apr 23, 2009 at 04:02 PM.
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Old Apr 24, 2009 | 11:12 PM
  #8  
vetteoz's Avatar
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: VATS question

Originally Posted by johnrstuch
Okay now i am confused.
So am I

When you say " start" ; do you mean crank over or run?

Engine will "start" using remote button indicates nothing wrong with battery
More info needed
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Old Feb 13, 2010 | 09:23 PM
  #9  
johnrstuch's Avatar
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Joined: Apr 2009
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From: Jacksonville,FL
Car: 89 Trans am GTA
Engine: 350
Transmission: 700R4
Axle/Gears: not sure
Re: VATS question

the engine will only crank.
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