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Old 04-15-2018, 10:53 AM
Malo 809 Malo 809 is offline
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IACV Problems

Hi All, I just purchased a 1998 Honda Accord LX Coupe with a 2.3L 4 Cyl 5 speed manual transmission at an auction. The car has 159K miles on it. This will be my daily for the foreseeable future so I need to get this thing in good running condition ASAP. Iíve fixed a bunch of problems already but I have one main problem I canít seem to fix.

The car had a bunch of codes all of which have been cleared except for this P1519 IACV Circuit Failure code. Along with the code I have a fluctuating idle between 1200-1400 RPM, assuming the two are related once this is fixed I should be good to go. (Side note at idle exhaust really stinks which I believe means Iím running lean which I also believe could be tied to this IACV problem because the AF ratio is off). After some quick research I came across this site with some troubleshooting steps.

Initially I tested the circuit and had a good solid ground connection on pin 3, steady battery voltage on pin 2 and 6-7 volts on pin 1, all checking out right? So I move to the valve. I removed it from the car and checked the resistance as per the troubleshooting steps. The Ohm readings were way out of range, so bad part right? I run to the local parts store and $160 later Iím back with a new part, I check the Ohm readings as per the troubleshooting steps and bam 10 OHMs on the nose so all should be good. I install the part hook up my coolant lines test everything, top off my coolant and crank the motor. The code is still on and he motor still has a fluctuating idle. So I go back under the hood, pull the connector and test voltage again. All the numbers are still adding up. What else can I try? Iím starting a new job tomorrow and itís a 40 mile commute, I would really love to have the car running in good condition before then.
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Old 04-15-2018, 07:41 PM
Malo 809 Malo 809 is offline
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Re: IACV Problems

I had a friend suggest checking/replacing the MAF sensor, I'm skeptical but at this point I'm willing to try anything. Going to try that tomorrow morning. If anyone else has some insight or suggestions, PLEASE HELP! Much appreciated.
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Old 04-16-2018, 11:34 AM
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Re: IACV Problems

These cars don't have MAF sensors. Did you burp the cooling system to remove any trapped air? You have/had an air leak somewhere.
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Old 04-16-2018, 06:12 PM
Malo 809 Malo 809 is offline
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Re: IACV Problems

Yea when I refilled the coolant after installing the new IACV I did burp the system.

Last edited by Malo 809; 04-16-2018 at 11:03 PM.
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Old 04-17-2018, 09:47 PM
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Re: IACV Problems

So I have an update. I found the service manual for my car and there are some troubleshooting steps for this particular issue. Steps include testing the IACV plug for battery power, ground continuity and the signal wire from the PCM to the connector. All check out down to the last step which says to plug in the IACV, switch the car to on and check the signal wire at the PCM end of it for voltage. It asks if there is "battery voltage" which to me means 12.4 V that I'm getting at the battery right? The reading at the PCM is 10.2 V.

Would the loss of 2V account for this issue? The next steps in troubleshooting say if there is battery voltage to replace the PCM with a known good working one and test again if no, replace the IACV.

Any suggestions? If it's the PCM I'll probably try to order one on eBay, I'm seeing some for $90-100 with warranty.


.....giving up hope on finding help here -_-
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