[mudoilngears]

What you fail to see is we are on the same team.

No, you are not, you are on here to make money, Buster is not. And yes, it was babble.

 

[Buster28]

No short, replacing the PCM will fix the problem;
If shorted, replacing the PCM won’t fix the problem.
That’s my understanding, right?

There are two separate +5 Vdc supplies, some sensors share one supply and a different set of sensors share the other supply. The issue to resolve is why only the IAT sensor is affected.

 

[Kuenjchen]

Just providing 5v is much easier than identifying the problem?!

 

[Buster28]

You cannot just provide 5 volts and have the circuit work correctly.

 

[Kuenjchen]

Why it won’t work ? Just providing 5v as input to sensor and output to PCM. Cut the original input wire ,connecting the 5v and keep the output wire!

If I replace the pcm, it is still not working, I need to rewire the IAT wire, in case of short!

 

[Buster28]

The +5 volts is not connected to directly to the IAT sensor, it is connected to a resistor on the PCM circuit board.

 

[Kuenjchen]

How about use other sensor’s 5v?

 

[Buster28]

Confirm that the sensor identified as the IAT is the one your actually measuring 12 Vdc across the two pins on the wiring harness connector.

 

[Kuenjchen]

Yes!

 

[mudoilngears]

This is probably a dumb question. Are you sure you are reading 12v and not .12v?

 

[Kuenjchen]

Let me double check! If it’s .12v , what does it mean? But I remember first digit is 1 , it’s impossible to be .12.

 

[mudoilngears]

Let me double check! If it’s .12v , what does it mean? But I remember first digit is 1 , it’s impossible to be .12.

12mV could mean a broken connection, far more likely than a short to bat +.

 

[Buster28]

DTC P0112 is set when the PCM sees an excessively low input signal voltage which suggests the signal wire from the sensor to the PCM is shorted to ground. If you measure from ground to ground with a digital voltmeter it could read a few millivolts.
BTW the pull-up resistor is 10K ohms

 

[Kuenjchen]

12mV could mean a broken connection, far more likely than a short to bat +.

Thank you for your input!

 

[Kuenjchen]

One guy had same problem 5v became 12v, 2 diodes burnt!