On Wed, 24 Mar 2004 18:05:27 -0700, Tom <booyang1@hotmail.com> wrote:
>
> Droo,
>
> The procedure is simple enough, but if you've never used a multimeter
> before, I'd recommend you either have someone there to help you or have a
> shop check it for you.
>
> Start your truck and let it warm up, and then run it above 1200rpm for at
> least 2 minutes. Check the voltage between pin 41 on the PCM connector
> and ground. The voltage should fluctuate between 400 and 600 milivolts
> (0.4 - 0.6 volts). If the voltage is not in that range, or if the
> voltage stabilizes at either end, then the sensor is probably going bad.
>
> To check if the sensor is shorted to ground, do a resistance check
> between pin 41 and ground. If the resistance is low (a few ohms or less)
> , then the sensor is probably shorted. If the resistance is infinite (OL
> - "open line", or very large), then the sensor isn't grounded.
>
> It should take about 10 minutes to change out the sensor if it's bad. On
> the Gen 1 Daks, it's in the exhaust pipe right at the Y-pipe where the
> exhaust manifolds join together; you can see it looking down the right
> (passenger's) side of the engine with the hood open.
>
> You don't have to remove the sensor to check it. Hope this helps.
>
Very helpful. I have an 03 4.7...don't they have two o2 sensors?
-- -Droo
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