2001 Honda Accord P1498

Tiny
KOLOMBIANO1
  • MEMBER
  • 2001 HONDA ACCORD
Electrical problem
2001 Honda Accord 4 cyl Automatic 108602 miles

P1498: EGR Valve Lift Sensor High Voltage. How could I fix that problem? I know where is the EGR, but I dont know nothing about the Voltage, what do I need to do?

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Tuesday, August 5th, 2008 AT 9:59 PM

6 Replies

Tiny
RASMATAZ
  • MEMBER
Its probably cracked open-see info below

A lift sensor on top of the EGR valve works just like a TPS sensor. There are three wires: a signal wire (yellow or white/blue) that goes back to the ECM, a 5-volt reference wire and a ground wire. With the EGR valve closed, the voltage should be about 1.2 volts. Normally anything more than 1.4 volts will set the light because the ECM thinks the EGR valve is open when it should not be. The voltage will increase as the valve opens. The ECM watches the voltage and then compares it to the predetermined values set in the programming of the ECM. The EGR is lifted by engine vacuum and the ECM has a solenoid it grounds when it commands EGR operation. The ECM will ground this solenoid when it sees the correct engine temperature, correct MAP sensor voltage, and throttle position sensor voltage. With the solenoid, the constant vacuum control (CVC) valve controls a constant vacuum for EGR operation. This valve takes the manifold vacuum signal and puts it to a constant 8 to 10 inches. Without a constant vacuum signal, EGR operation would be erratic. The EGR solenoid and the CVC valve location varies by model, but are often found in the black emission boxes under the hood on the fire wall. To locate, use a component locator or just follow the vacuum line.

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Wednesday, August 6th, 2008 AT 4:13 AM
Tiny
KOLOMBIANO1
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So the best thing to do, will be to replace EGR Valve?

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Wednesday, August 6th, 2008 AT 4:32 PM
Tiny
RASMATAZ
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You need to open it up and investigate thoroughly-just don't throw parts at it-could be the valve/wiring/computer
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Wednesday, August 6th, 2008 AT 5:09 PM
Tiny
KOLOMBIANO1
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I got the Haynes Repair Manual and I did the check to check the operation of the EGR Valve, and the engine didnt idle rought. So I think I will have to replace the EGR Valve.
What you think?

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Wednesday, August 6th, 2008 AT 6:36 PM
Tiny
RASMATAZ
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Did you open it up? If its carboned-up the pintle/stem won't move.
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Wednesday, August 6th, 2008 AT 9:33 PM
Tiny
KOLOMBIANO1
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I took it off and this is what i got(see the pic), or do i deen to open the Valve all the way? how it has to look?


http://www.2carpros.com/forum/automotive_pictures/223887_CIMG0842_1.jpg



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Wednesday, August 6th, 2008 AT 11:13 PM

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