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Old 07-15-2003, 11:14 PM   #1
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Default Sensor locations?

Recently had engine replaced and am in the process of installing all new sensors. I need to know where the coolent sensor, MAP and MAF sensors are located. 94 SSEi.
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Old 07-16-2003, 12:13 AM   #2
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With my mind on my money and my money on my mind.

MAF sensor sits on top of the throttle body - It looks like a square. The MAP sensor (If it is like the 93) is a rectangle shaped thing that sits behind the supercharger on the driver'* side.
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Old 07-16-2003, 12:17 AM   #3
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The coolant sensor is in the overflow tank if my memory serves me correct -it is in the overflow tank on my sisters 1995 Buick Riviera with the same motor as you anyhow.
The MAP sensor??? -Didn't know these cars had one. If you meant the o2 (oxygen) sensor on your car there should be one just behind the motor in the exhaust manifold/down-pipe. If you look down between the motor and the firewall (seperates passenger compartment from engine bay) and follow the exhaust pipe up from under the car you will see it -it looks like a spark plug with a single wire going into it. Also if I remember correctly you will actually have to go after it from under the car due to the piping and the supercharger not allowing much space to work. (if someone else know for sure please fill in this question).
The MAF sensor (I thought this was the MAP sensor on the 3800'*) is the rectangular black box that sits on top of the throttle body (disconnect + battery terminal, unplug MAF sensor, and then use a philips tip screw driver to remove the three screws, lift sensor up out of the TB, and put replacement unit on reversing the removal process).

Hope this helps.

Stylez
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Old 07-16-2003, 02:48 AM   #4
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Thanks for the fast reply fellas. Will go ahead and swap those out. By the way, will disconnecting the battery reset an error code on the auto temp control for the AC and heat?
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Old 07-16-2003, 01:52 PM   #5
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Follow the procedure in Techinfo to reset climate control codes.

I believe only the supercharged Series 1 had the MAP sensor in 1994. Both models should have had the MAF sensor.

Which coolant sensor are you talking about, the coolant level sensor or the coolant temperature sensor?
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Old 07-16-2003, 04:10 PM   #6
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Quote:
Originally Posted by fuddyduddy121
Which coolant sensor are you talking about, the coolant level sensor or the coolant temperature sensor?
FWIW, the coolant-level sensor is on the passenger'* side radiator end tank, about 1/3 of the way down, directly beneath the radiator cap, with a 2-wire connector on it. The coolant temperature sensor is on the engine itself, somewhere slightly buried in the vicinity of the thermostat housing, I think...
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Old 07-16-2003, 09:42 PM   #7
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I tried the reset procedure for the Auto Temp Control listed in techinfo once before. It did not work maybe I did something wrong. It stated that the person said it worked on his 93 bonnie but was not sure about later models. I will try it again. Thank you guys for the help. Now I know where all the sensors I want to replace are. You guys are great!!!
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Old 07-16-2003, 11:22 PM   #8
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Quote:
Originally Posted by laydbaak
I tried the reset procedure for the Auto Temp Control listed in techinfo once before. It did not work maybe I did something wrong.
I can compare what it says there with what my '93 factory manual says, but in reality I think those codes will eventually expire by themselves anyway. If the error condition is cleared, I think the codes will clear by themselves after 50 driving sessions (or less).
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Old 07-16-2003, 11:55 PM   #9
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I checked it out in the 93 manual - It should work. Once you get to mode 03 C, then press fan up. The codes should be cleared when TEMP is displayed. Then repeatedly press off.

I have a 94 climate control head in my car. Maybe I'll test the procedure on mine when I get a chance.
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Old 07-17-2003, 04:28 PM   #10
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Quote:
Originally Posted by fuddyduddy121
I checked it out in the 93 manual - It should work. Once you get to mode 03 C, then press fan up. The codes should be cleared when TEMP is displayed. Then repeatedly press off.
Right. Just so we're totally clear on this: beyond the error codes themselves, you can work through three groups of diagnostic Modes, shown as 01 C, 02 C and 03 C. Make sure you see the "C" following the two-digit code, which indicates that it'* showing you a Mode number, as opposed to an error code, temperature reading or something else.

Once you've selected which diagnostic Mode you want to be in, you can then (for the 01 C and 02 C groups) step through a set of other commands, for either getting readings out (01 C), or operating various gadgets in test mode to see if they're working (02 C). When you get to the 03 C Mode, you can clear the codes, as fuddyduddy121 explained. After that (or at any other point along the way), pressing OFF repeatedly will step you back out in the order you came in.
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