98 blazer ?

[kc5nqx]

Where is fuse 5 located i got the diagram off off autozone.com engine schematic and the PK wire from the o2 sensors go to fuse 5 where is this fuse 5 at? under the under hood diagram does not show number loctions. any help

[MT-2500]

Originally Posted by kc5nqx

Where is fuse 5 located i got the diagram off off autozone.com engine schematic and the PK wire from the o2 sensors go to fuse 5 where is this fuse 5 at? under the under hood diagram does not show number loctions. any help

Here it is. In under hood fuse box.
http://members.troublecodes.net/crunch/oxgensenf.pdf

[wirenut699]

There are also fuses on the left side of the dashboard near the driver's door hinge The diagram in the link that MT2500 posted is for under the hood

I just checked my 1999 diagram which may or may not match for the 1998, but

the three O2 sensors are on a fuse marked "OXYGEN" and it is under the hood. My diagram does not show the O2 sensors on a fuse #5.

[kc5nqx]

thanks that helps a little.. there are a few fuses on my cover under the hoop that the writing has wore off .. can u give a better discreption on where it is on the block

[kc5nqx]

damn guess i should have looked at the link thanks!! 1 more question from that fuses where does it run to computer? im trying to find the signal wirre from the 2 upstream wires that run to the puter

[kc5nqx]

Im just lost from this diagram
http://autozone.com/images/cds/gif/l...3d8018c178.gif

witch wire is the signal wire ? how can the signal wire from all 3 02 sensors run into the same wire i would have thought the computer need 2 read all the signals on a difffernt wire for each 1? it might be easer with the color codes where even close to mine ... i have 2 solid brown wires witch i know are the heater part of the circuit and a purple wire and a black wire.. i no the purple is the signal but i need too know where it goes i would have figured it would have went to ECM instead fuse 5? does fuse 5 go to ECM ? maybe this better explans to yall what im asking ..

thank you for taken time to read my ramblings

[MT-2500]

Originally Posted by kc5nqx

Im just lost from this diagram
http://autozone.com/images/cds/gif/l...3d8018c178.gif

witch wire is the signal wire ? how can the signal wire from all 3 02 sensors run into the same wire i would have thought the computer need 2 read all the signals on a difffernt wire for each 1? it might be easer with the color codes where even close to mine ... i have 2 solid brown wires witch i know are the heater part of the circuit and a purple wire and a black wire.. i no the purple is the signal but i need too know where it goes i would have figured it would have went to ECM instead fuse 5? does fuse 5 go to ECM ? maybe this better explans to yall what im asking ..

thank you for taken time to read my ramblings

Here is a pdf of pcm wiring. 4 page wiring 4.3 vin w engine
You may have to copy each page them off and lay side by side to get a good picture of it .
If that does not give you what you need let us know.
http://members.troublecodes.net/crunch/9843blazervw.pdf

[MT-2500]

Originally Posted by kc5nqx

Im just lost from this diagram
http://autozone.com/images/cds/gif/l...3d8018c178.gif

witch wire is the signal wire ? how can the signal wire from all 3 02 sensors run into the same wire i would have thought the computer need 2 read all the signals on a difffernt wire for each 1? it might be easer with the color codes where even close to mine ... i have 2 solid brown wires witch i know are the heater part of the circuit and a purple wire and a black wire.. i no the purple is the signal but i need too know where it goes i would have figured it would have went to ECM instead fuse 5? does fuse 5 go to ECM ? maybe this better explans to yall what im asking ..

thank you for taken time to read my ramblings

Fuse 5 in auto zone link is the under hood 02 sensor fuse.
It only feeds the 02 sensor heaters.
What is your Blazer doing or not doing?
Any codes or is it blowing fuses?

[kc5nqx]

I want to thank you for posting those schemtaics you are the man... was the same O2 sensor problem i posted about few weeks ago still had problems evertime it rained it would act up so i took drasict measures this weekend got 2 new upstream bosch senors off ebay for a hell of a deal and ran new wires from sensor's too the ECM both hi and low signal wires... kept the heater part of the circuit factory for now.. and the down stream sensor i instll a 02 sensor elimator. lite alwasy came on and off since i had convertor cute off .. but all is great with it now !!!! thanks for help

[MT-2500]

Originally Posted by kc5nqx

I want to thank you for posting those schemtaics you are the man... was the same O2 sensor problem i posted about few weeks ago still had problems evertime it rained it would act up so i took drasict measures this weekend got 2 new upstream bosch senors off ebay for a hell of a deal and ran new wires from sensor's too the ECM both hi and low signal wires... kept the heater part of the circuit factory for now.. and the down stream sensor i instll a 02 sensor elimator. lite alwasy came on and off since i had convertor cute off .. but all is great with it now !!!! thanks for help

You are welcome and glad you got it figured out.
MT