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Bill R
Lv 7
Bill R asked in Cars & TransportationCar MakesHonda · 1 decade ago

Honda Man or others >>> Odyssey 1491 code is back?

I verified a bad EGR valve and replaced it. (find old post in July for details). Everything was fine and was back to normal.

Now after about 1500 miles the 1491 code is back.

I have verified everything in the manual RE the valve and the valve appears OK.

sensor resistance OK; Stalls when batt volt applied; 5v on sensor from PCM; 6-7 volts on coil leads from PCM; ground on pin 6 thru PCM; the only thing not verified it the connection to pin 1 of the connector.

There are no other codes as there was last time (misfire and power train codes). And it doesn't go away as it did last time when I run a constant 60mph for an hour or so. It also does not set as fast as it did the last time. It took almost 100 miles to set a temp code and another100+ miles to set it permanent (at 60mph).

The engine does not run rough like it did the last time.

Without subbing the PCM is there anyway to test it?

Any other hints?

thanks for your help

Update:

2000 Ody 108,600 miles - intake manifold cleaned last time also

Update 2:

and I cleaned it to the valve

Update 3:

tube was installed by dealer at about 36,000 miles

3 Answers

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  • honda guy
    Lv 7
    1 decade ago
    Favorite Answer

    did you install the EGR tube kit when you fixed it last July or did you just replace the valve? If you just changed the valve then the EGR tube is clogged with carbon and that is what is causing the code to come back.

    If you changed the valve and the tube then you need to purge the EGR passage that the tube goes into. The code is for a low flow/no flow of exhaust gas from the EGR into the engine so you need to find the restriction in the airflow if the valve is working.

    Hope that helps

  • willoroy
    1 decade ago

    check the pin fits in the egr connector-hondas are known for the pins pushing out when disconnecting and re-connecting connectors- the pin for the flow sensor may have corrosion or be pushed out and not getting contact-also check for rodent damage to wiring(chewed wires,rodent droppings in intake valley,ect).common on these for some reason. if rodent damage is evident spray silicone lubricant on all wires-they don't like it.

  • MANUEL G
    Lv 5
    1 decade ago

    try snaking egr tube with drill and piece of speedo cable or replace tube does your scan tool offer bidirectional controls?

    Source(s): a.s.e master auto tech 15 yrs exp
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