My son has a 2002 HO with the 6 speed with about 80K miles.
The VP44 was replaced last June.
He put an Edge EZ on about 2 months ago.


Two days ago the check engine light came on.

The codes are
P0112 Intake Air / Charge Temperature Sensor Low
P0237-Map Sensor Voltage To Low

We cleaned the IAT but it did not look that dirty also check the resistance across the two terminals. The resistance was about 19k ohms.
So I think the IAT is still good.

Did not clean the MAP. Did not have a deep socket to remove it.
Did remove the Edge EZ from the truck.

We cleared the codes but they return immediately after starting while idling.

We checked all the air intake boots. We can not find a leak.
Is there any boost at idle? The codes come back right after starting.

I do not think it is a ground issue because there are 4 other sensors that share the same ground (splice).

Is this a ECM issue?
Is there a way to determine if the ECM is the problem?
If it is the ECM, where can you get one besides the dealer?
Can an Edge EZ damage the ECM?

 

I had a bad battery get me the P0237. New battery cleared the code.
Check the voltage on each battery, should be 12.6 volts or better.

 

We checked all the wiring and grounds and found nothing wrong.
Got a new IAT sensor but it still shows it low voltage.
Measured the voltage on the IAT connector and it has 5 volts.

With the IAT sensor disconnected and the voltage at the connector at 5 volts, this should have set code P0113 IAT sensor voltage high.
We never got that code.

So we think it is the ECM.
Who is a good ECM rebuilder?
Which ones should we avoid?

 

The ECM was bad mine. I borrowed one off of a buddy's truck started up and ran perfect. Called around to a bunch of junk yards found one in another state for a 99 even though mines in 02 250 bucks shipped runs like a champ and this was all before I put my Edge programmer in

 

Thanks for sharing 02dodge4x4!!!