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Cadillac 96 Seville STS, 89 Sedan Deville
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Discussion Starter #1
Ok so i just got my 96 Seville STS all fixed up and running for summer, Spent about $1000. Anyways I'm driving back home and I stop for a STOP sign go to hit the gas and oh look I'm not going anywhere :mad: . Look at my tach its at zero so I pushed the beast off to a side street (you never know how much your car weighs until you've done this alone.) sat down waited for about twenty minutes and tried to start it again. Did this about ten times minus the waiting as long. Finally gave up called my brother in law to come give me a push. Got back home smashed my inner taillight out trying to get it in the driveway, best f***ing day of my life I thought to myself :mad: :bighead: :mad: . I figured time to pull some codes so off I went into diagnostics mode, This is what I pulled.

All DTC Codes Current:
PC0102- Mass Airflow Sensor Circuit Low Frequency
PC0231- Fuel Pump Circuit Low Voltage
PC1645- Evap Purge Valve
TC0033- Best I Can Find Its A Rear Wheel Speed Sensor (Explains My TC & ABS Light Being On)
AC1347- Low Refrigerant (Its Leaking Because I Just Put A Can Of R-134a In)

Bought a new fuel pump after checking the fuse and relay, pumps on the way.
Any help would be greatly appreciated, Let me know if i got any codes wrong.
Almost forgot to top all this off I had to get a new trunk pull down assembly the day before because i was delaying getting a new switch so it got stuck in the on position shredding 1/4 of the plastic gear and destroying the motor.
 

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99 Seville STS, 08 STS4 N* 1SG F55
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3,516 Posts
Check the battery, battery connectiion and charging system. Mass random code popping is often a sign of low voltage.
 

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Cadillac 96 Seville STS, 89 Sedan Deville
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27 Posts
Discussion Starter #3
Check the battery, battery connectiion and charging system. Mass random code popping is often a sign of low voltage.
voltage checks out from dic and multimeter... the multimeter read 11.98 but thats because of my stubborn will and i trying to get it to start messing with the diagnostics inside etc.

I pulled out the multimeter though and I got even more worried that it might not be the fuel pump I did a DC voltage test from the testing points on the top of the fuse and Im not getting anything reading 000 fuse is fine and so is the relay, not my meter because i tested the wipers with them on and it read 148. tested and swapped both the fuse and relay, am I just overthinking this or what? Does this happen when the fuel pump goes bad? Im just losing my mind waiting for the fuel pump to get here so I can at least try. Worsts comes to worst I'll have a new fuel pump and being paying a stealership a ton of $$$$$$ to find the problem.
 

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1996 STS
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105 Posts
I believe your problem is the P0102, (MAF Sensor Circuit Low Frequency), when the DTC sets, thw PCM automatically disables the EVAP control solenoid and it disables the long term fuel trim. The PCM substitutes calculated MAF value for actual MAF. Rememeber, you will get the code if the MAF output frequency drops under 1135 Hz. Check the freq. and lastly check the MAF sensor itself. It is the rectangular looking box on the side of your throttle body, it has a connector. I have one for sale if your interested.

Did you also get the service emission system message.
 

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Cadillac 96 Seville STS, 89 Sedan Deville
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27 Posts
Discussion Starter #5 (Edited)
I dont really understand how the maf could make my car not start but yes i did get a check emissions system, check electrical system, and check fuel system not in that order but you get the idea. If the maf you have is used then no thank you because at this point i'd rather spend more money and know that a specific piece new and is not whats causing a problem. My seville has 169000 miles and its getting to the point where i have to know whats new and what is going to die or is about ready for a change. How would i go about testing the frequency of the MAF output from the pcm? And how would i go about testing the maf? The manual i got is a pos and just tells me to replace it, im also curious about what all a rebuild on a maf constists of because from what i understand they dont really go bad they just get dirty unless the coil breaks, do you know?
 
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