Knock Sensor 1 Low Voltage possible Connector problem - Chevy Impala SS Forum
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post #1 of 21 (permalink) Old 04-17-2019, 12:10 AM Thread Starter
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I was going through a rather involved snap on professional scan tool that allowed me to do function tests and take over control of certain systems. Couldn’t get any B+ voltage out of wiring harness connector during KO step one, so I guess I need to check the physical wires continuity, which means disconnecting the C2 connector from the pcm and doing the tone / continuity test on the wire itself to see if I’ve got a broken wire.
I’ll let you know the outcome.
Oh. And BTW...
I also couldn’t get Fan #1 to come on (small one on passenger side) during the relay test. Is that indicating a bad relay or is that indicating a bad fan motor.
I’ve seen that fan run when the A/C is on a while ago so I’m pretty sure it still works.
Thank you all for any and all suggestions, advice and information.
I appreciate your time!!

K&N Gen II Cold Air Intake, HB Removed, Jet Airfoil, TB bypass, Stealth Brake Biasing, Cat Back Exhaust w/ side by side crossover.

Last edited by SoCalChlln; 04-24-2019 at 05:06 PM.
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post #2 of 21 (permalink) Old 04-17-2019, 08:08 AM
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Disconnect the coolant temp sensor on the front of the water pump. That should cause the PCM to turn on both fans.

Ken
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post #3 of 21 (permalink) Old 04-17-2019, 03:52 PM Thread Starter
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Quote:
Originally Posted by Ken Hennessy View Post
Disconnect the coolant temp sensor on the front of the water pump. That should cause the PCM to turn on both fans.

Ken
Thank you Ken !
That’s the exact kind of information that makes life 10 times easier when troubleshooting problems like this with these older B Bodies...
I appreciate your time and effort in responding

K&N Gen II Cold Air Intake, HB Removed, Jet Airfoil, TB bypass, Stealth Brake Biasing, Cat Back Exhaust w/ side by side crossover.
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post #4 of 21 (permalink) Old 04-17-2019, 03:55 PM Thread Starter
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Last time I looked at the knock sensors the one on the drivers side had a poor to loose connection with a connector that looks like it should be replaced. Knock sensor 1 is on the drivers side correct ?
Any help is appreciated greatly.
Thank you ahead of time for any and all responses !!!

K&N Gen II Cold Air Intake, HB Removed, Jet Airfoil, TB bypass, Stealth Brake Biasing, Cat Back Exhaust w/ side by side crossover.
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post #5 of 21 (permalink) Old 04-17-2019, 04:42 PM
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Bank 1 sensor 1 is the driver side upstream sensor, bank 1 sensor 2 is the drivers side downstream sensor, bank 2 sensor 1 is the passenger side upstream sensor, and finally bank 2 sensor 2 is the passenger side downstream sensor.

This is assuming a 96 vehicle, if 95 and earlier you only have two sensors so bank 1 is driver side and bank 2 is passenger side.

1996 DGGM Impala SS
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post #6 of 21 (permalink) Old 04-17-2019, 06:14 PM
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Oh ****, my bad. LOL. Guess my mind is still on my new CAT's and 02 sensors I just swapped out.
gbhs72 likes this.

1996 DGGM Impala SS
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post #7 of 21 (permalink) Old 04-18-2019, 01:03 AM Thread Starter
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Quote:
Originally Posted by 4x4high View Post
Bank 1 sensor 1 is the driver side upstream sensor, bank 1 sensor 2 is the drivers side downstream sensor, bank 2 sensor 1 is the passenger side upstream sensor, and finally bank 2 sensor 2 is the passenger side downstream sensor.

This is assuming a 96 vehicle, if 95 and earlier you only have two sensors so bank 1 is driver side and bank 2 is passenger side.
Thank you 4x4 for the informative response. That was exactly what I needed to know in a precise and concise format.
I appreciate the time and effort in responding!
I hope you have a great tomorrow and beyond...

K&N Gen II Cold Air Intake, HB Removed, Jet Airfoil, TB bypass, Stealth Brake Biasing, Cat Back Exhaust w/ side by side crossover.
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post #8 of 21 (permalink) Old 04-18-2019, 01:05 AM Thread Starter
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Quote:
Originally Posted by 4x4high View Post
Oh ****, my bad. LOL. Guess my mind is still on my new CAT's and 02 sensors I just swapped out.
No worries 4x4...
I’m confused most of the time on my own LOL...
Thank you for taking the time to respond.
It’s greatly appreciated...

K&N Gen II Cold Air Intake, HB Removed, Jet Airfoil, TB bypass, Stealth Brake Biasing, Cat Back Exhaust w/ side by side crossover.
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post #9 of 21 (permalink) Old 04-18-2019, 01:13 AM Thread Starter
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Quote:
Originally Posted by Marky Dissod View Post
KNOCK Sensors. Not oxygen sensors. Knock.
Still, driver side should be 1, passenger should be 2.

If, after disconnecting H2Opump temp sensor, one of the fans does not turn on, swap the fan relays by the windshield wiper motor.
(If they're still in the box, relocate them outside the box when you get a chance. If the floor of the box underneath the relays looks cooked, relocate the relays immediately.)
If the OTHER fan decides not to run, replace the fan relay.
If the SAME fan decides not to run, replace the fan motor.
If BOTH FANS decide not to run, replace fan motor AND relay.
Once again saved by the ISS forum...
Thank you Marky for the information, that’s exactly what I needed to know in determining why the fan wouldn’t cycle on...
And how to fix it...
As usual your responses are accurate concise and to the point with all the relevant info and advice.
I appreciate the time and effort in responding to my question.
I hope you have had a great day today, and an even better tomorrow... 👍

K&N Gen II Cold Air Intake, HB Removed, Jet Airfoil, TB bypass, Stealth Brake Biasing, Cat Back Exhaust w/ side by side crossover.
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post #10 of 21 (permalink) Old 04-18-2019, 09:06 AM
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96 knock sensors are different than 94-95 if you are replacing it

\'96 BBB 383/T-56
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