Techtalk6609 Service Bulletin/Repair Instructions

Optimized Idle batteries dying (no OI...
Nathaniel Main 8 posts since Sep 28, 2019

Optimized Idle batteries dying (no OI specific faults) Nov 1, 2019 9:26 PM

Customer has a 2020 new Cascadia using parksmart and OI. This is the 3rd dealership the customer has

come to with this issue. Previous dealerships could find no problem with OI. Previous dealerships tested entire

powernet system. I rechecked all points. Everything looks good. Customer states that when he is in extreme

cold or heat conditions running OI and parksmart overnight, OI fails and batteries die. Customer states that he

tried setting OI to both interior comfort on and off. Both OI modes start and initially run correctly. Some time

in the night, the batteries die without OI engaging battery mode. I checked all parameters, parameters are set

correctly. Ambient temperature is correctly reading. I cleared the numerous faults and let the truck complete

the initial OI run time and then let parksmart run with OI in standby mode. When batteries dropped below the

default 12.2v threshold, OI started the engine perfectly. Battery mode charged the batteries to a steady 14.1v.

I have been on the phone with DTTS all day, and nobody can find any resolution. Has anyone run into this

issue? I attached all of the faults that were present upon the trucks arrival. I troubleshot system sSam power

faults, and everything looks fine
Talbert Simonian 1,831 posts since Nov 21, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Nov 2, 2019 12:03 AM

What is the VIN? I would like to look more into it. Is it using Parksmart or Optimized Idle?
Nathaniel Main 8 posts since Sep 28, 2019

Re: Optimized Idle batteries dying (no OI specific faults) Nov 4, 2019 4:49 PM

VIN: 3AKJHHDR1LSLT6986

OI set to either interior comfort on or off has same results. Parksmart runs between OI engine run cycles.
Kyle Siebert 4,101 posts since Nov 14, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Nov 2, 2019 2:36 AM

You can change the O/I restart from 12.2 to a higher voltage of like 12.4 or so.
We have been seeing quite a few of those super heavy duty AGM batteries testing bad.
Nathaniel Main 8 posts since Sep 28, 2019

Re: Optimized Idle batteries dying (no OI specific faults) Nov 4, 2019 4:47 PM
1
Optimized Idle batteries dying (no OI...
Customer already took the truck home instead of trying to replicate fault overnight as DTTS recommended.

I did notice that when the truck went into battery mode, the initial start at 12.15v hardly started the engine.

But no faults are being logged for battery mode going into continuous mode because of battery failure. The

procedure I took to begin troubleshooting was OI>interior comfort on>initial engine run phase> 1.5 hours

voltage drop from 13.4v to 12.15>OI initialized battery mode 2 hour cycle>battery voltage maintained 14.1v

while running>standby mode with similar battery drain as first standby.
The customer states that there are 2 vehicles in their fleet with identical problems, so if it is some sort of issue

with parameters, it would be good for future reference.
Kyle Siebert 4,101 posts since Nov 14, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Nov 4, 2019 6:39 PM

Now I’m not sure if it will set a code if the hood is opened during a O/I restart.
So you could check the mounting of the hood tilt switch
Also, would have to check switch in parts pro to see if open and closed resistance readings are

open/closed circuits or if it’s a change in resistance. A switch that is open closed type, you could

have a intermittent open circuit and it won’t be a issue till a o/i restart.
Nathaniel Main 8 posts since Sep 28, 2019

Re: Optimized Idle batteries dying (no OI specific faults) Nov 5, 2019 4:53 PM

there were no faults or issues with the hood tilt switch. I checked the operation while OI was in a running cycle.

When the hood opens, OI alerts and stops engine cycle.
Nathaniel Main 8 posts since Sep 28, 2019

Re: Optimized Idle batteries dying (no OI specific faults) Nov 5, 2019 4:53 PM

The main issue is that the batteries somehow go below the battery mode threshold without starting the OI

battery mode.
Chris Vanboom 172 posts since Nov 21, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Nov 18, 2019 9:14 PM
2
Optimized Idle batteries dying (no OI...
We had one here with the exact same issue, replacing Aux and Main batteries ended up fixing it. You can

monitor the last 5 OI cancellations with DDDL if you want to check for an intermittent hood tilt switch issue. Find

"Latest OI dropout reason (0-4)" in instrumentation.
Nathaniel Main 8 posts since Sep 28, 2019

Re: Optimized Idle batteries dying (no OI specific faults) Nov 19, 2019 2:07 PM

I'll keep that noted if we see another truck with this issue again. I wasn't aware of that instrumentation field.
German Alamos 3 posts since Dec 3, 2018

Re: Optimized Idle batteries dying (no OI specific faults) Apr 23, 2020 3:32 PM

I HAVE A UNIT CUSTOMER CAME IN FOR HOOD TILT SWITCH FAULTY, CHECKED UNIT OVER

FPUND EVERYTHING WORKING PROPLERY WITH HOOD TILT SWITCH, CORRECT VOLTAGE, WIRES

CHECKED OUT GOOD, CALLED CUSTOMER TO GET MORE INFO SAY OI CUTS OUT AND DOES NOT

READ HOOD SWITCH, CHECKED BATTERY VOLTAGE READS 12.34 VOLTS, CHECKED OI DROP OUTS

SHOWS NOTHING ASSISGNED
3
Optimized Idle batteries dying (no OI...
, I ALSO ADDED 2 PICTURES OF CODES UNIT CAME IN WITH AND OI DROP OUT 0-4
Kyle Siebert 4,101 posts since Nov 14, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Apr 23, 2020 7:02 PM

So was the issue was a hood tilt switch?

Interesting it wasn’t detected by this drop out parameter.
German Alamos 3 posts since Dec 3, 2018

Re: Optimized Idle batteries dying (no OI specific faults) May 25, 2020 3:58 AM

The problem was just a hood tilt switch, installed a new one and everything started working as it should with no

problems, unit never came back to the shop
Justin Johnson 983 posts since May 12, 2017

Re: Optimized Idle batteries dying (no OI specific faults) Nov 18, 2019 6:54 PM

Were you able to get to the bottom of this one, Nathaniel?
Nathaniel Main 8 posts since Sep 28, 2019

Re: Optimized Idle batteries dying (no OI specific faults) Nov 19, 2019 2:05 PM
4
Optimized Idle batteries dying (no OI...
I wasn't able to. The customer had taken the truck after the first night. Haven't returned since. But, the

customer said that his fleet has 3 trucks with this issue, so I figured it would be a good thread to continue in

case this is a broad issue with the OI/PS system.
German Alamos 3 posts since Dec 3, 2018

Re: Optimized Idle batteries dying (no OI specific faults) Apr 23, 2020 8:07 PM

I LEFT TRUCK IN OI MODE, WENT TO WORK ON OTHER UNIT AND CHECKED PRDIOTICALLY ON

UNIT, UNIT STARTED WHEN BATTRIES GOT BELOW 12.2 AS IT SHOULD, THEN WHEN I CAME BACK

UNIT WAS OFF AS IT SHOULD BE, CALLED TECH SUPPORT AND TALKED WITH THEM, HAD ME

CHECK HOOD SWITCH MOUNTING WHITCH WE FOUND RIVETS MOVED AROUND BUT HELD SENSOR

IN PLACE HAD ME INSTALL NEW RIVETS AND WILL RUN UNIT IN OI THROUGH THE NEXT DAY TO SEE

IF THAT FIXES IT
Kyle Siebert 4,101 posts since Nov 14, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Jul 16, 2020 6:36 PM

We had one here with the exact same issue, replacing Aux and Main batteries ended up fixing it. You can

monitor the last 5 OI cancellations with DDDL if you want to check for an intermittent hood tilt switch issue. Find

"Latest OI dropout reason (0-4)" in instrumentation.

Found this in CPC, * (enumeration), AS: OI Last Dropout Reason 1

This was also for a CPC5

s/n MH2906

Thank you for the tip Chris Vanboom Just expanding on it a little
Nathaniel Main 8 posts since Sep 28, 2019

Re: Optimized Idle batteries dying (no OI specific faults) Jul 17, 2020 6:55 PM

Glad I posted this here. That truck gave us hell. Good to know a solution was found.
Kyle Siebert 4,101 posts since Nov 14, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Sep 29, 2020 8:34 PM

Have one here with CEL complaint and CPC code 1663/7 inactive. GHG14 engine.

Trying now to figure out what the "latin/engineer" terms are supposed to mean for "OI enable fault" and "OI

cruise main off" as Latest OI Dropout Reason.

Doesn't seem to be described in:

GHG14/GHG17

REFERENCE GUIDE

GHG14/GHG17 DDEC13 Electronic
5
Optimized Idle batteries dying (no OI...
Controls Application and Installation

or

Optimized Idle User Manual
Kyle Siebert 4,101 posts since Nov 14, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Sep 29, 2020 8:35 PM
6
Optimized Idle batteries dying (no OI...
Mike Swint 4 posts since Nov 14, 2014

Re: Optimized Idle batteries dying (no OI specific faults) Dec 31, 2020 9:28 PM

I have one in the shop same complaint, vin LP0671, I agree it would be nice to know what all the terms they

use mean. I was looking at "opti idle VPS request" it shows level 13.?? What's that mean? I can load the

batteries down below the 12.2 volt opti idle start threshold and nothing changes. hood switch statue is staying

closed so I don't believe that to be a issue. In the older models I could always check the battery feature by just

loading the batts with a carbon pile and it would start right up. I was watching all battery voltages, including the

aux parksmart batts, and all dropped below the 12.2 but nothing happens.
7

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