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O2 sensors fuse in engine compartment box?

Tiny
WILL HURLEY
  • MEMBER
  • 1998 DODGE DAKOTA
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I am having a crank with no start problem. I've checked everything I can possibly think of fuel at rail is 49PSI, spark is present when cranking, etc. So, I went to the ASD and Fuel pump relays to check them, and relays are in working order, but I also checked fuses in that box and every fuse has power on both sides except the O2 sensors. I pulled the box and inspected wires on the underside, and all looked fine. Is this fuse fed as constant power, or where does it get power from?
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Wednesday, August 30th, 2023 AT 2:16 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,300 POSTS
Hi,

Fuse 3 (30 amp) in the power distribution box sends power to the ASD relay. From the relay, power goes to fuse A which is responsible for powering the oxygen sensors.

Take a look at the schematic below and let me know if this helps.

Take care,

joe

See pics below.
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Wednesday, August 30th, 2023 AT 9:05 PM

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