Mechanics

I DID THE TROUBLE CODE WITH THE CHECK ENGINE LIGHT AND RECIEVED CODES 24, 25 AND 31 AND DO NOT UNDERSTAND THE MEANINGS.

1994 Toyota Pickup • 234,000 miles

Code 24 says "intake air temp signal fault. Code 25 says air/fuel ratio lean. And code 31 says Air flow meter circuit or vacuum sensor signal fault.I have checked all vacuum lines and all are good. I can't figure what I am to fix. My truck is at one point idle low and volts low, when the volts go up the idle goes up. Mpgs has dropped and it is all together running badly. The check engine was on once before with only code 25 showing, it did go off for about a month after changing the plugs. I had one bad burnt plug.
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Mmfid
November 10, 2011.




Diagnostic Trouble Codes - 1994
Toyota

12

G, NE Signal Circuit No. 1.

13

G, NE Signal Circuit No. 2.

14

Ignition Signal.

16

ECT Control Signal.

21

Oxygen Sensor (OS) Signal.

22

Water Temperature Sensor (THW) Signal.

24

Intake Air Temperature Sensor (THA) Signal.

25

Air/Fuel ratio lean.

26

Air/Fuel ratio rich.

27

Sub-oxygen sensor signal.

31

Manifold Absolute Pressure Sensor Signal.

41

Throttle Position Sensor (TPS).

42

Vehicle Speed Sensor (VSS) Signal.

43

Starter Circuit Signal.

51

Switch Condition Signal.

52

Knock Control Signal.

71

EGR system malfunction.

Rasmataz
Nov 12, 2011.
I have the codes. My question is, what do the codes mean?
#24-Intake air temperature sensor (tha) signal.
Does this mean a signal or sensor is out and needs replaced?
If so how do I find the sensor?
#25-Air/fuel ratio lean.
I can't find any info on this fix. What needs fixed?
#31-Manifold absolute pressure sensor signal
This was different then my info, but again, does this mean
a sensor is out? If so, how do I find it?
Thanks.
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Tiny
Mmfid
Nov 12, 2011.

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