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Sticky ECU Code 14
Hello, a friend's 1996 Honda City (with an engine almost identical to
the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, rotary). However it still keeps blinking the same code, and I tried resetting the ECU (overnight!) and even pulling other sensors, but it keeps blinking code 14, and won't blink any other error even when other sensors are disconnected. What could be the problem? Thanks so much. |
Re: Sticky ECU Code 14
"sharx333" <emil.santos@gmail.com> wrote in message
news:1167467781.208192.54020@s34g2000cwa.googlegro ups.com... > Hello, a friend's 1996 Honda City (with an engine almost identical to > the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. > The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, > rotary). > > However it still keeps blinking the same code, and I tried resetting > the ECU (overnight!) and even pulling other sensors, but it keeps > blinking code 14, and won't blink any other error even when other > sensors are disconnected. > > What could be the problem? Thanks so much. > I'm thinking a hefty vacuum leak into the intake manifold. That would cause a high idle and make the ECU think the IAC wasn't responding because the ECU had ordered a lower idle and the IAC wasn't delivering on that. A close visual inspection of hoses on the intake manifold is a good place to start. Cracks right at the ends are most common. Mike |
Re: Sticky ECU Code 14
"sharx333" <emil.santos@gmail.com> wrote in message
news:1167467781.208192.54020@s34g2000cwa.googlegro ups.com... > Hello, a friend's 1996 Honda City (with an engine almost identical to > the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. > The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, > rotary). > > However it still keeps blinking the same code, and I tried resetting > the ECU (overnight!) and even pulling other sensors, but it keeps > blinking code 14, and won't blink any other error even when other > sensors are disconnected. > > What could be the problem? Thanks so much. > I'm thinking a hefty vacuum leak into the intake manifold. That would cause a high idle and make the ECU think the IAC wasn't responding because the ECU had ordered a lower idle and the IAC wasn't delivering on that. A close visual inspection of hoses on the intake manifold is a good place to start. Cracks right at the ends are most common. Mike |
Re: Sticky ECU Code 14
"sharx333" <emil.santos@gmail.com> wrote in message
news:1167467781.208192.54020@s34g2000cwa.googlegro ups.com... > Hello, a friend's 1996 Honda City (with an engine almost identical to > the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. > The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, > rotary). > > However it still keeps blinking the same code, and I tried resetting > the ECU (overnight!) and even pulling other sensors, but it keeps > blinking code 14, and won't blink any other error even when other > sensors are disconnected. > > What could be the problem? Thanks so much. > I'm thinking a hefty vacuum leak into the intake manifold. That would cause a high idle and make the ECU think the IAC wasn't responding because the ECU had ordered a lower idle and the IAC wasn't delivering on that. A close visual inspection of hoses on the intake manifold is a good place to start. Cracks right at the ends are most common. Mike |
Re: Sticky ECU Code 14
"sharx333" <emil.santos@gmail.com> wrote in message
news:1167467781.208192.54020@s34g2000cwa.googlegro ups.com... > Hello, a friend's 1996 Honda City (with an engine almost identical to > the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. > The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, > rotary). > > However it still keeps blinking the same code, and I tried resetting > the ECU (overnight!) and even pulling other sensors, but it keeps > blinking code 14, and won't blink any other error even when other > sensors are disconnected. > > What could be the problem? Thanks so much. > I'm thinking a hefty vacuum leak into the intake manifold. That would cause a high idle and make the ECU think the IAC wasn't responding because the ECU had ordered a lower idle and the IAC wasn't delivering on that. A close visual inspection of hoses on the intake manifold is a good place to start. Cracks right at the ends are most common. Mike |
Re: Sticky ECU Code 14
"sharx333" <emil.santos@gmail.com> wrote in news:1167467781.208192.54020
@s34g2000cwa.googlegroups.com: > Hello, a friend's 1996 Honda City (with an engine almost identical to > the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. > The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, > rotary). > > However it still keeps blinking the same code, and I tried resetting > the ECU (overnight!) and even pulling other sensors, but it keeps > blinking code 14, and won't blink any other error even when other > sensors are disconnected. > > What could be the problem? Thanks so much. > Is the idle still high? -- Tegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
Re: Sticky ECU Code 14
"sharx333" <emil.santos@gmail.com> wrote in news:1167467781.208192.54020
@s34g2000cwa.googlegroups.com: > Hello, a friend's 1996 Honda City (with an engine almost identical to > the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. > The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, > rotary). > > However it still keeps blinking the same code, and I tried resetting > the ECU (overnight!) and even pulling other sensors, but it keeps > blinking code 14, and won't blink any other error even when other > sensors are disconnected. > > What could be the problem? Thanks so much. > Is the idle still high? -- Tegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
Re: Sticky ECU Code 14
"sharx333" <emil.santos@gmail.com> wrote in news:1167467781.208192.54020
@s34g2000cwa.googlegroups.com: > Hello, a friend's 1996 Honda City (with an engine almost identical to > the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. > The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, > rotary). > > However it still keeps blinking the same code, and I tried resetting > the ECU (overnight!) and even pulling other sensors, but it keeps > blinking code 14, and won't blink any other error even when other > sensors are disconnected. > > What could be the problem? Thanks so much. > Is the idle still high? -- Tegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
Re: Sticky ECU Code 14
"sharx333" <emil.santos@gmail.com> wrote in news:1167467781.208192.54020
@s34g2000cwa.googlegroups.com: > Hello, a friend's 1996 Honda City (with an engine almost identical to > the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle. > The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin, > rotary). > > However it still keeps blinking the same code, and I tried resetting > the ECU (overnight!) and even pulling other sensors, but it keeps > blinking code 14, and won't blink any other error even when other > sensors are disconnected. > > What could be the problem? Thanks so much. > Is the idle still high? -- Tegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
Re: Sticky ECU Code 14
Thanks for the responses. Tegger, we haven't started the engine yet. The error code appears when the ignition key is in the 'On' position. We've already tried leaving the battery disconnected overnight to "clear" the code, we also tried (in desperation) connecting the old IACV, but the code won't go away. I also tried disconnecting the TP and MAP sensors, but it still blinks "14" (IAC). I checked the resistance of the new IAC and one pair of terminals read 19 ohms, all other pairs read open. Could it be a bad ECU? Mike: I wish it were, but the code appears even before we start the engine. We haven't done that yet, because we're worried the ECU may be bad. Tomorrow I'm going to try disconnecting the same sensors on a Civic of the same series (EK) and see what error pops up. The owner is really worried, knowing the cost of a new ECU.. |
Re: Sticky ECU Code 14
Thanks for the responses. Tegger, we haven't started the engine yet. The error code appears when the ignition key is in the 'On' position. We've already tried leaving the battery disconnected overnight to "clear" the code, we also tried (in desperation) connecting the old IACV, but the code won't go away. I also tried disconnecting the TP and MAP sensors, but it still blinks "14" (IAC). I checked the resistance of the new IAC and one pair of terminals read 19 ohms, all other pairs read open. Could it be a bad ECU? Mike: I wish it were, but the code appears even before we start the engine. We haven't done that yet, because we're worried the ECU may be bad. Tomorrow I'm going to try disconnecting the same sensors on a Civic of the same series (EK) and see what error pops up. The owner is really worried, knowing the cost of a new ECU.. |
Re: Sticky ECU Code 14
Thanks for the responses. Tegger, we haven't started the engine yet. The error code appears when the ignition key is in the 'On' position. We've already tried leaving the battery disconnected overnight to "clear" the code, we also tried (in desperation) connecting the old IACV, but the code won't go away. I also tried disconnecting the TP and MAP sensors, but it still blinks "14" (IAC). I checked the resistance of the new IAC and one pair of terminals read 19 ohms, all other pairs read open. Could it be a bad ECU? Mike: I wish it were, but the code appears even before we start the engine. We haven't done that yet, because we're worried the ECU may be bad. Tomorrow I'm going to try disconnecting the same sensors on a Civic of the same series (EK) and see what error pops up. The owner is really worried, knowing the cost of a new ECU.. |
Re: Sticky ECU Code 14
Thanks for the responses. Tegger, we haven't started the engine yet. The error code appears when the ignition key is in the 'On' position. We've already tried leaving the battery disconnected overnight to "clear" the code, we also tried (in desperation) connecting the old IACV, but the code won't go away. I also tried disconnecting the TP and MAP sensors, but it still blinks "14" (IAC). I checked the resistance of the new IAC and one pair of terminals read 19 ohms, all other pairs read open. Could it be a bad ECU? Mike: I wish it were, but the code appears even before we start the engine. We haven't done that yet, because we're worried the ECU may be bad. Tomorrow I'm going to try disconnecting the same sensors on a Civic of the same series (EK) and see what error pops up. The owner is really worried, knowing the cost of a new ECU.. |
Re: Sticky ECU Code 14
sharx333 wrote:
> Thanks for the responses. > > Tegger, we haven't started the engine yet. The error code appears when > the ignition key is in the 'On' position. We've already tried leaving > the battery disconnected overnight to "clear" the code, we also tried > (in desperation) connecting the old IACV, but the code won't go away. I > also tried disconnecting the TP and MAP sensors, but it still blinks > "14" (IAC). I checked the resistance of the new IAC and one pair of > terminals read 19 ohms, all other pairs read open. Could it be a bad > ECU? > > Mike: I wish it were, but the code appears even before we start the > engine. We haven't done that yet, because we're worried the ECU may be > bad. > > Tomorrow I'm going to try disconnecting the same sensors on a Civic of > the same series (EK) and see what error pops up. > > The owner is really worried, knowing the cost of a new ECU.. > dude, start the engine to see if you've fixed the problem first!!! if not, /then/ worry about the code. and if replacement doesn't cure, check the wiring. also, make sure your coolant level is correct. |
Re: Sticky ECU Code 14
sharx333 wrote:
> Thanks for the responses. > > Tegger, we haven't started the engine yet. The error code appears when > the ignition key is in the 'On' position. We've already tried leaving > the battery disconnected overnight to "clear" the code, we also tried > (in desperation) connecting the old IACV, but the code won't go away. I > also tried disconnecting the TP and MAP sensors, but it still blinks > "14" (IAC). I checked the resistance of the new IAC and one pair of > terminals read 19 ohms, all other pairs read open. Could it be a bad > ECU? > > Mike: I wish it were, but the code appears even before we start the > engine. We haven't done that yet, because we're worried the ECU may be > bad. > > Tomorrow I'm going to try disconnecting the same sensors on a Civic of > the same series (EK) and see what error pops up. > > The owner is really worried, knowing the cost of a new ECU.. > dude, start the engine to see if you've fixed the problem first!!! if not, /then/ worry about the code. and if replacement doesn't cure, check the wiring. also, make sure your coolant level is correct. |
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