Idle Cycling up and Down and P2195 (1 Viewer)

[AppleTech]

Wife called me today with CEL/VSC TRAC/VSC OFF lights. Got it home and confirmed that the only code on it is P0000. Cleared it. Truck is idling oddly - changes by about 100 RPM every second and idle sounds bad. Plugs are fairly new (less than 10k mi). Any clue what would cause this behavior? Video is here: 2020-12-14 15.14.01.mov Note this happens with AC on or off.

Any advice would be greatly appreciated!!

UPDATE: Hooked up to Techstream and see the following in the Engine section:

Ran health check and see these:

 

[AppleTech]

OK so I just did a little inspection with a probe stethoscope. PS pump is making a pretty audible whine. Pulled the belt and it spins freely without grit. Had a look at the reservoir. Not empty but low. Looks like there is a slow weep from the PS unit. I don't know if that is the cause of the idle or not - the frequency of it makes me think it is something electrical rather than mechanical?

 

[jahawk]

Those pumps are noisy new so I think you're right in that it's probably not that. I would start with looking for a vacuum leaks, a sticking PVC valve, and clean the throttle body.

Jim

 

[LXKevin]

There is an air control valve on the back of power steering pump that sends a vacuum signal to the intake. A puff of white smoke on startup is a sign that the diaphragm inside it is failing & can send power steering fluid into the air intake. You can pull the air intake housing at the throttle body and inspect for evidence of power steering fluid there. I had the white smoke puff and slight loss of power steering fluid corrected by replacement of the valve. My idle was slightly erratic also but no codes and no lights on dash. It may be contributing to your idle issue.
part replaced- POWER STEERING PRESSURE AIR CONTROL VALVE 17630-16040

Here's an article describing P0000

P0000 – No fault – TroubleCodes.net

www.troublecodes.net

 

[ramangain]

You can always try the ECU reset (read: battery disconnect). Remembah - dem ECUs r so smaht!

 

[jerryb]

it would be better if you were watching rpm on techstream or another obd2 device. The vvti idle is 700 -+50.
I have never read about p2000, it would make me skeptical of the reader.
If it's bad enough to trigger the abs lights then it would be odd to show you a null code.

 

[AppleTech]

Next time it triggers I will read the code in Techstream. It is possible my reader can't pull it (ScanGauge II). I pulled the 2 main vacuum leads at the front of the intake (I think these are the two main vacuum sources?) and plugged them one at a time. Neither had an effect on the idle surge.

 

[AppleTech]

Updated with info from Techstream. Any help appreciated as the codes don't come up under a search here.

 

[LXKevin]

?

 

[AppleTech]

UPDATE: Hooked up to Techstream and see the following in the Engine section:

Ran health check and see these:

I'm guessing I just need to replace Bank 1 Sensor 1?

 

[LXKevin]

I'm guessing I just need to replace Bank 1 Sensor 1?

Have you cleaned your MAF Sensor?

 

[AppleTech]

Have you cleaned your MAF Sensor?

I have not but the code seems to indicate it is a O2 sensor stuck at lean?

 

[LXKevin]

You're right. I figure the O2 sensor sends lean signal to the puter to compensate for richness in the exhaust which could be dirty MAF. That does sound backwards now that i think of it, but it's easy to clean MAF and the throttle body. I looked up the code & book says check for broken or loose connections at the front bank one O2 sensor and check the EFI relay.

 

[AppleTech]

OK so I can't figure out where the O2 sensor is. The part lists include "UPSTREAM LH/RH" and "DOWNSTREAM LH/RH". Code says Bank 1 (which is LH side), sensor 1. The only parts location diagrams I see show "Sensor 2" for Bank 1 and Bank 2. Where are "Sensor 1" located for each bank???

 

[AppleTech]

Found it. Odd it isn't listed in the parts diagram I have in my FSM. Replaced both on the same bank. So far the idle has straightened out nicely and CEL has held off. We'll see!