Concerns regarding IACV 1450A116

TAIMUR AHMED

MEMBER
2005 MITSUBISHI LANCER
1.6L
4 CYL
2WD
AUTOMATIC
69,600 MILES

I have the car listed above it is a CVT. I live in Pakistan and Mitsubishi has wound up its operations. Only one last dealership remains which is 1,600 km from my town. My car's IACV (MD619857) went bust and had to be replaced. The Mitsubishi dealership told me that this old part number had been replaced with a new one for my car's VIN which was 1450A116. I checked it online as well and confirmed that this new part number was for my vehicle.

However, when the IACV arrived and I had it installed it was dead. I contacted the Mitsubishi dealership and they told me (which I was not informed about earlier) that this new model 1450A116 IACV needed to be programmed in the ECU. However, the only dealership that has the MUT-III tool is 1,600 km from my town.

I wanted to verify whether the dealership's narrative is true or are they just trying to shrug me off.

4 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

I do not believe that the valve is programmed, it is just a stepper motor. There is a special connector that is used to test the motor electrical circuit, this is maybe what they are referring too. Apart from that I believe that it is just a straight install.

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Thursday, November 9th, 2017 AT 3:17 PM

STEVE W.

MECHANIC
13,416 POSTS

I do not see any programming for that number, There are directly interchangeable in every other application listed.

How did you test the old one?

Here is the test for that part number IACV:

On a cold engine 20°C (68°F) you should hear the UAC move if you turn the key on.

Disconnect the idle air control motor connector.
Measure resistance between terminal No.2 and either terminal No.1 or terminal No.3 of the connector at the idle air control motor side.

Measure the resistance between terminal No.5 and either terminal No.6 or terminal No.4 of the connector at the idle air control motor side.

Standard value for both tests: 28 - 33 ohms at 20°C (68°F)

If they pass this test then it is likely in the driver circuit. Unfortunately they never sold that engine in the US Lancer so I do not have a good wiring diagram.

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Friday, November 10th, 2017 AT 6:41 AM

TAIMUR AHMED

MEMBER
2 POSTS

The old motor had been giving rpm drops down to 400-500 for a good four to five months. Then one day the car motor failed completely and the car would jerk, shudder and turn off when car was near standstill. I did not need to test the motor at that point to realize that it was busted.

After I installed the new one, I realized that it was not changing rpm when under load such as moving the power steering or turning on AC or headlights, etc. I did visit some local mechanics each of whom put a junk-salvaged old model motor into the car. With the older model motor the car's rpm changes under load and idling becomes very smooth (in each case).

However, when the new model motor is put back in, then it becomes unresponsive. W.R.T. Your reference to driver circuit. What is the driver circuit? Is it sth that needs programming?

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Friday, November 10th, 2017 AT 7:02 AM

STEVE W.

MECHANIC
13,416 POSTS

No the driver circuit is working if the older IACV is working. It is part of the computer.
If the older ones fit and work, run one of them. It is possible the new unit is bad even though it is new.
There is no programming needed to use any of the part numbers I can find that cross to your original part.

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Friday, November 10th, 2017 AT 7:57 AM