Voltage Tables

25057 Views 57 Replies 17 Participants Last post by ILIKESHELBYS, Jun 14, 2010

bholland

Discussion Starter · Sep 10, 2007

Does anyone know what the voltage to charge air temperature table is?

I have just purchased an LM-3 AuxBox from Innovate Motorsports and I want to record the charge air temps from my sensor but I don't know what the voltage conversion table is.

Also does anyone have the EGT conversion table as well??

Thanks,

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NAJ

· #21 · Nov 11, 2007

All sensors weather they are 3 wire variable resistors(MAP, TPS) or 2 wire thermistors
(ACT,CTS) operate on a 5 volt reference.
Anytime you have a problem with a sensor circuit unplug the connector at the sensor and with the key on using a digital voltmeter probe the 5 volt reference line to ground and you should read 5 volts.Then probe the reference line and the signal return line(controller ground) and you should read 5 volts.This verifies these 2 circuits are ok.
Then plug the connector back in and backprobe the signal line and signal ground to check the voltage output of the sensor and backprobe and check at the controller,the voltage should read the same,this verifies the signal line is ok.
Once you verify the circuit's are ok you can compare voltages to the voltage table to check sensor operation.
Without a scan tool you cannot verify what the controller is actually seeing.

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speeduphoria

· #22 · Apr 12, 2008

Nice i missed this thread, I have some values for GM 3 bar map, GM air temp, I will get part numbers shortly. These are used for my SDS standalone but may help MS guys, I can also get the GM Coolant temp.

GM 3 bar map sensor(-psi means vac)
PSI/Vac Volt
-28.5, 0.078
-27.1, 0.156
-25.7, 0.234
-24.2, 0.313
-22.8, 0.391
-21.4, 0.469
-19.9, 0.547
-18.6, 0.625
-17.1, 0.703
-15.7, 0.781
-14.8, 0.859
-12.9, 0.938
-11.4, 1.016
-10.0, 1.094
-8.60, 1.172
-7.17, 1.25
-5.75, 1.328
-4.33, 1.406
-2.91, 1.484
-1.49, 1.563
-0.06, 1.641
0.670, 1.719
1.370, 1.797
2.060, 1.875
2.760, 1.953
3.460, 2.031
4.160, 2.109
4.860, 2.188
5.560, 2.266
6.250, 2.344
6.950, 2.422
7.650, 2.5
8.350, 2.578
9.050, 2.656
9.750, 2.734
10.40, 2.813
11.10, 2.891
11.80, 2.969
12.50, 3.047
13.20, 3.125
13.90, 3.203
14.60, 3.281
15.30, 3.359
16.00, 3.438
16.70, 3.516
17.40, 3.594
18.10, 3.672
18.80, 3.75
19.50, 3.828
20.20, 3.906
20.90, 3.984
21.60, 4.063
22.30, 4.141
23.00, 4.219
23.70, 4.297
24.40, 4.375
25.10, 4.453
25.80, 4.531
26.50, 4.609
27.20, 4.688
27.90, 4.766
28.60, 4.844
29.00, 4.922
30.00, 5

GM Air temp sensor
degF Volt
320 0.04
293 0.12
257 0.2
221 0.28
203 0.36
192 0.44
183 0.51
176 0.59
169 0.67
162 0.75
154 0.83
147 0.91
142 0.99
138 1.07
135 1.15
131 1.23
127 1.31
126 1.39
122 1.47
120 1.54
117 1.62
113 1.7
109 1.78
106 1.86
104 1.94
102 2.02
99. 2.1
95. 2.18
93. 2.26
91. 2.34
90. 2.42
88. 2.5
84. 2.57
81. 2.65
77. 2.73
75. 2.81
73. 2.89
72. 2.97
70. 3.05
68. 3.13
66. 3.21
63. 3.29
61. 3.37
59. 3.45
57. 3.53
55. 3.6
52. 3.68
48. 3.76
46. 3.84
45. 3.92
41. 4
39. 4.08
36. 4.16
34. 4.24
32. 4.32
27. 4.4
23. 4.48
19. 4.56
14. 4.63
5.0 4.71
-4. 4.79
-13 4.87
-31 4.95

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R/Tony

· #23 · Aug 12, 2008

Hey .. got to reactivate this post...

I am using 4bar map sensor (Megasquirt) does anyone have a list of values just like this GM 3bar map but for the 4bar map ?:
GM 3 bar map sensor(-psi means vac)
PSI/Vac Volt
-28.5, 0.078
-27.1, 0.156
-25.7, 0.234
-24.2, 0.313
-22.8, 0.391
-21.4, 0.469
-19.9, 0.547
-18.6, 0.625
-17.1, 0.703
-15.7, 0.781
-14.8, 0.859
-12.9, 0.938
-11.4, 1.016
-10.0, 1.094
-8.60, 1.172
-7.17, 1.25
-5.75, 1.328
-4.33, 1.406
-2.91, 1.484
-1.49, 1.563
-0.06, 1.641
0.670, 1.719
1.370, 1.797
2.060, 1.875
2.760, 1.953
3.460, 2.031
4.160, 2.109
4.860, 2.188
5.560, 2.266
6.250, 2.344
6.950, 2.422
7.650, 2.5
8.350, 2.578
9.050, 2.656
9.750, 2.734
10.40, 2.813
11.10, 2.891
11.80, 2.969
12.50, 3.047
13.20, 3.125
13.90, 3.203
14.60, 3.281
15.30, 3.359
16.00, 3.438
16.70, 3.516
17.40, 3.594
18.10, 3.672
18.80, 3.75
19.50, 3.828
20.20, 3.906
20.90, 3.984
21.60, 4.063
22.30, 4.141
23.00, 4.219
23.70, 4.297
24.40, 4.375
25.10, 4.453
25.80, 4.531
26.50, 4.609
27.20, 4.688
27.90, 4.766
28.60, 4.844
29.00, 4.922
30.00, 5

How can I take the 0 to 5v value from the 4bar map inside my Megasquirt ECU ?

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R/Tony

· #24 · Aug 12, 2008

UnaClocker said:
Where are you trying to take them to? You simply tell the MS that it's got a 4 bar and you're golden.

I want the Map signal to drive the Water/alky kit... the megasquirt does already know that it has a 4bar map and its reading fine, the problem is the map voltage to activate the spray.

There are just 4 types of progressive controllers from Devilsown, 1bar, 2bar, 3bar, and direct voltage reader, so I could use the last one only If I had the direct voltage reference from Megasquirt, or maybe with an external 4bar map with a 0-5v output.

87turbodance

· #25 · Oct 2, 2008

This is useful for me because I would rather just change the code then make hardware changed to MS - that way I can use the MS for a different car without having to worry about ripping out the resistors.

UnaClocker said:
Nah, not really. Just use a 10k bias resistor when assembling the MS, and the stock TD (and Neon) sensors work great. It's even written in the assembly instructions.

speeduphoria

· #26 · Oct 2, 2008

R/Tony said:
I want the Map signal to drive the Water/alky kit... the megasquirt does already know that it has a 4bar map and its reading fine, the problem is the map voltage to activate the spray.

There are just 4 types of progressive controllers from Devilsown, 1bar, 2bar, 3bar, and direct voltage reader, so I could use the last one only If I had the direct voltage reference from Megasquirt, or maybe with an external 4bar map with a 0-5v output.

IMO you want all the water injection to be max by 30psi anyway so I would just use the 3 bar setup.

I thought MS had something to control meth injection though but not sure

Matt Cramer

· #27 · Oct 3, 2008

Depends on the version - most MS versions can support dual table code so that one bank drives fuel injectors and the other bank drives injectors loaded with something else, but MS1/Extra has the option of a dedicated water / meth injection code using an Aquamist fast acting valve. The dedicated code version requires special hardware mods, while the dual-fuel use does not.

ekimgb

· #28 · May 24, 2009

NAJ said:
Map Sensor Response Chart Turbocharged
Pressure in Inches/HG to Voltage
24.01HG/.43V
18.11HG/.93V
12.20HG/1.42V
6.30HG/1.92V
.39HG/2.41V
2.71PSIG/2.91V
5.61PSIG/3.41V
8.51PSIG/3.90V
11.31PSIG/4.40V
14.31PSIG/4.90V
TPS Response Chart
Throttle Position in Degrees to Increase of Minimum TPS Volts
Closed Throttle
10 DEGS/0.00V
20 DEGS/0.38V
30 DEGS/0.75V
Half Throttle
45 DEGS/1.31V
58 DEGS/1.80V (1)
75 DEGS/2.43V (2)
Wide Open Throttle
90 DEGS/3.00V

(1) The computer will usually consider an increase of 1.80 volts or more over the minimum TPS voltage to be WOT.
(2)2.43 volts above the minimum TPS voltage during cranking will cause the computer to recognize Clear Flood request shutting off all fuel delivery.

FOr tps
Would these apply to 1986 daytona 2.2 turbo. When i check it off the trottle body is .50v when it attached to the throttle body it is .75v. It seem to sweep well though. but goes right to 4.99v

NAJ

· #29 · May 24, 2009

Yes your voltage is fine.
When you turn the key on the controller looks at TPS voltage and as long as it is in parameters for closed throttle it uses this voltage as a"minimum" TPS voltage and bases everything else off of this.
If you read data with a scanner it will show "target TPS voltage(minimum) and "actual TPS voltage.
My TPS reads .40 volts at closed throttle and I have seen them read as high as .90 at closed throttle.
WOT could be anywhere from 3.50 volts to 5.00 volts.

ekimgb

· #30 · May 24, 2009

Thanks alot. Ive been having problems with the car when it warm. It wants to hesitate miss and even buck when hot. I am missing the heat sheild between the exaust and the injectors. You think the injectors could get to hot and fail. I jimmy rigged a heat shield today and it seemed to be better. Only a couple small misses. Also i was wondering about tracing my power loss light. I have checked the bulb and it is fine but light never comes on. any suggestion?

ekimgb

· #31 · May 24, 2009

NAJ said:
Yes your voltage is fine.
When you turn the key on the controller looks at TPS voltage and as long as it is in parameters for closed throttle it uses this voltage as a"minimum" TPS voltage and bases everything else off of this.
If you read data with a scanner it will show "target TPS voltage(minimum) and "actual TPS voltage.
My TPS reads .40 volts at closed throttle and I have seen them read as high as .90 at closed throttle.
WOT could be anywhere from 3.50 volts to 5.00 volts.

Thanks alot. Ive been having problems with the car when it warm. It wants to hesitate miss and even buck when hot. I am missing the heat sheild between the exaust and the injectors. You think the injectors could get to hot and fail. I jimmy rigged a heat shield today and it seemed to be better. Only a couple small misses. Also i was wondering about tracing my power loss light. I have checked the bulb and it is fine but light never comes on. any suggestion?

NAJ

· #32 · May 25, 2009

You should probably open a new thread, no one will find this in the Voltage Tables Sticky.
Does the Power Loss Lamp illuminate during the key on cluster bulb test?
Have you connected a scanner to see if it will communicate?
You need to know if there are any hard faults in the system before you can begin diagnosing a driveability concern.

ekimgb

· #33 · May 25, 2009

NAJ said:
You should probably open a new thread, no one will find this in the Voltage Tables Sticky.
Does the Power Loss Lamp illuminate during the key on cluster bulb test?
Have you connected a scanner to see if it will communicate?
You need to know if there are any hard faults in the system before you can begin diagnosing a driveability concern.

I can't find where i can make a new thread. I don't think im aloud to. Bulb does not come on at all. Don't Know if it will communicate. And your right it would be good to know if there are any faults.

NAJ

· #34 · May 26, 2009

I think as long as you are logged in you can open a thread.
Go to forums, click on Turbo Dodge Help and at the top right underneath the page #'s above all the threads click on Forum Tools, then click on "Open New Thread".

Ondonti

· #35 · Jul 16, 2009

NAJ, I am looking for the fuel level sender resistance table. I want to buy a fuel cell, and hoping I can find one with a level sender I can use.

NAJ

· #36 · Jul 16, 2009

I will take a look but do not ever remember seeing a table for the sending unit.

NAJ

· #37 · Jul 16, 2009

Looked it up specifically for your vehicle and this is all I could find.
Hope this helps.

The fuel level sensor is a variable resistor, whose resistance changes as the level of fuel in the tank change.

As the level float arm moves, the wiper on the sensor moves along the trace, either closer to or further away from, the sensor signal terminal.

The further away the sensor pickup is, the higher the resistance across the sensor is.

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bholland

Discussion Starter · #38 · Dec 12, 2009

Does anyone know what the voltage table is for the oil pressure sensor / sending unit for 1987 electronics?
Thanks

NAJ

· #39 · Dec 13, 2009

The oil sending unit is a pressure sensitive resistor, the system operates on 12 volts.

Description and Operation

This oil pressure indicating system incorporates an instrument voltage regulator, electrical oil pressure gauge and a sending unit which are connected in series. The sending unit consists of a diaphragm, contact and a variable resistor. As oil pressure increases or decreases, the diaphragm actuated the contact on the variable resistor, in turn controlling current flow to the gauge. When oil pressure is low, the resistance of the variable resistor is high, restricting current flow to the gauge, in turn indicating low oil pressure. As oil pressure increases, the resistance of the variable resistor is lowered, permitting an increased current flow to the gauge, resulting in an increased gauge reading.

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bholland

Discussion Starter · #40 · Dec 28, 2009

Are there voltage tables for the oxygen sensor? Can you determine from the 3 -wire oxygen sensors what the exact AFR is?
Thanks

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