Which fuses control the heating circuit for bank 2 sensor1?

Hi,

Power is supplied the engine 1, 20-amp fuse in the under-hood fuse box. When you check this fuse, make sure there is power to and from it. It will only have power with the key in the run or start position.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

I attached two pics below and highlighted the relevant wiring for bank 2 sensor 1. Two wires go to the VCM, and one is from the power supply mentioned.

Take a look and let me know if it helps.

Take care,

joe

See pics below.

Thank you for your help, but i need to know what pin on the cable side of the 02 sensor is suppling 12 v to bank2 sensor 1. I remove cable coming from VCM but don't know were to check for 12v.
key on engine off. The diagram are not that good so, I can't tell where they are coming and going from, please send actual site the diagram might be better.

Hi,

I attached the portion of the VCM that the sensor signals go to. Both wires are in connector 1 at the VCM and are pins 19 and 25. See pics below. Note, the C1 connector will be blue in color.

As far as the site providing it, they come from Alldata. It isn't a free site, so if you need anything specific, let me know and I'll get it for you.

Take care,

Joe

See pics below.

Thank you for all the help. 1996 chevy truck 5.7l vortec motor.
I was wondering if you could tell me what color wiring and the pin number that comes from the VCM that supply's 12v dc to the bank2 sensor1 02 sensor.

so I can check incoming voltage from VCM, I am getting an engine code PO 1153.

Hi,

I attached the information below. Pic 2 is a pinout of the connector. Each wire in pic 1 is identified with a letter. The two pics work in conjunction with each other.

Let me know if this helps.

Take care,

Joe

See pics below.

First thank you for your help and for the diagrams.

1.So the picture above #12162144 is the cable coming from the VCM correct that connects to 02 bank2 sensor 1 , what two wires do i check for voltage and what is the voltage value at those two wires.
2.

Hi,

The one going to the "low" reference will provide a ground path. The other is a voltage signal. It should be 5v. See pic below

Let me know.

Joe

I was able to check the voltage for the vcm going to the two sensors
bank 1 sensor 1 and bank2 sensor 1 the pink and black pin only they are both 11.86 v dc ,i know the colors not the letters because can't find them, is this correct?

this is with key on, no run condition.

I don't know how to test the heater circuit coming from the vcm ?
or do i just test the heater circuit on the oxygen sensor cable ?

Hi,

If you are checking for a signal from the VCM, check at the connector.

Let me know.

Joe

I replace both upstream 02 sensors with some denso 02 sensors
i drove it around for about a half hour without check engine light coming on, It runs better ,but there is still a little feeling like not getting enough gas. I did a fuel leak pressure test when running I got 55 psi . I don't know the correct psi for my 1996 chevy truck 5.7l motor. can you let me know the psi when running. Thanks

Hi,

The manual only provides pressure with the engine off. See pic below for pressure specifications.

While the engine is running, the fuel pressure should drop about 5 psi, from the static prime pressure. If you snap the throttle, the fuel system pressure should jump up about 5 PSI.

Take a look at this link:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Based on the pressure you got with it running, it sounds like the pump is working as it should.

Let me know if this helps.

Take care,

Joe

See pic below.

I still has a little miss, like it needs more gas, or something don't know, I don't know how to check the vacuum system. was wounding if there are vacuum diagram for my truck? and if so, would you please email it to me, I bought a BTSHUB Auto Fuel Injector Cleaner Tool Kit Fuel Injector Tester Tool and would like to clean my injectors using these devices, But it with no instructions or customer service number. What is the size of the inlet fuel valve the device connects to on fuel rail on 1996 chevy truck 5.7l.

On the fuel rail what is the size of the inlet valve, the tool does not have the right one.

Hi,

I'm not sure what you are referring to when you say inlet valve. Could you upload a pic of it?

Also, I attached the vacuum schematic below for you. Additionally, here is a link that explains how to check for leaks:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

I may have already asked this, but if you have a live data scan tool, could you let me know what the short-term fuel trims are?

Let me know.

Joe

See pics below.

Sorry I meant the Shrader value on the fuel rail. What size do i need to hook up a tester?

Hi,

I had to find that one online. I attached a pic of the size. Let me know if that helps or if you have questions.

Take care,

Joe

See pic below.

Thanks, I was wondering if you can tell me on a 1996 chevy truck 5.7l, if i could replace the cable coming from the VCM going to bank2 sensor 1. I would like to replace it. have problems with the two upstream sensors. Also, how can i test my VCM to make sure it's not the problem, i need to smog my truck, can't same to find the problem.

Hi,

I would be happy to help, but I have a favor to ask. Is it possible for you to start a new post with that question? We try to keep the threads specific to one topic, so they are more helpful to others. I hope you understand.

Copy and paste your new question and one of us will be in contact with you.

Here is the link to start a new post:

https://www.2carpros.com/questions/new

Again, I hope you understand.

Take care,

Joe