Battery Re-Connect Procedure *

[DMAG]

http://anthony/phpBB2/templates/subSilver/images/spacer.gif From the service manual

BATTERY RECONNECTION
Note: This reconnection procedure is to be performed anytime the battery has been disconnected.
1. Connect the battery negative cable (2) to the battery
post and tighten the clamp nut.
2. Install the rear compartment floor trim panel.

CAUTION: Once the battery has been connected,
review and perform the following information as
applicable.

AUTO UP FRONT WINDOW
If the vehicle is equipped with the auto-up front window feature, once the battery is reconnected the door module
needs to be calibrated. The door module requires calibration anytime the battery or door module has been disconnected
for any length of time. To calibrate, perform the following:
1. Connect the battery cables.
2. Using the window switch, raise the window to the full UP position. Hold the switch in position for 1 second, then
drive the window all the way down to the bottom.

ELECTRONIC STABILITY PROGRAM (ESP)
If the vehicle is equipped with ESP, once the battery is reconnected, the Steering Angle Sensor (SAS) needs to be
calibrated. The SAS requires calibration anytime the battery or an ABS (ESP) component has been disconnected for
any length of time. To calibrate, perform the following:
1. Start the engine.
2. Center the steering wheel.
3. Turn the steering wheel all the way to the left until the internal stop in the steering gear is met, then turn the
wheel all the way to the right until the opposite internal stop in the steering gear is met.
4. Center the steering wheel.
5. Stop the engine.

[frank29]

I think M.D.S. reset is required in some cases. I have previously disconnected the battery with no M.D.S. ramifications; however, after a recent disconnect, my M.D.S. was inoperative. It seems to be a hit or miss thing. I am not positive the problem was related to the battery disconnect; I am positive M.D.S. wasn't working.

I hardly ever reset my average milage display. Normally, it hovers around 18. Recently, it dropped to 14. No change in driving habits. I reset my MPG reading and only got 17 mpg over a 30 mile trip using cruise control set at 60 miles per hour (it should have been 24 or so). I followed the MDS reset procedure and, PRESTO, my average m.p.g. jumped up to its historical levels.

My 05 300C owner's manual & service manual make no mention of this; however, the 06 owner's manual does. The second edition of the 05 Grand Cherokee does mention it. It seems strange M.D.S. reset would be required on some of these extremely similar powertrains and not on others.

If your mileage recently dropped with no change in driving habits, try the following procedure. No flaming required, I am not saying I bought this car with mileage in mind.....I am saying that when there is a drastic drop in mileage that a very simple reset solves, people need to be informed (especially since no documentation from Chrysler refers to the reset, at least for the 05 C models).

Procedure (as copied from another forum):

1. You need a fairly long, open, safe, straight road for a WOT run to about 35 mph.
2. Get engine up to operating temp., engine running and car stopped put selector in "D", move it to the right until in "1".
3. Turn off all electrical accessories (except lights if needed).
4. WOT run to 4500 RPM (about 35 mph), immediately remove foot from accelerator and do not depress the brake, let the vehicle coast with the throttle closed until the vehicle speed is again at 35 mph or lower.
5. Stop vehicle and place in "Park", verify all instrument cluster warning indicators are off.
6. Cycle ignition switch "Off" and back "On", but do not immediately start engine.
7. Hook up StarScan and clear DTC's
8. MDS calibration is now complete.

I stopped at step 6 due to not having a scan tool. There is one available for about $125 that I plan on purchasing for this and other reasons.

[fnkychkn]

no such thing as MDS recalibration. what you did is an adaptive numerator re-learn. this value only updates on decelleration because on decel there is no possible crankshaft speed fluctuation from misfires. this procedure is meant to allow the PCM to learn the difference in manufacturing tolerances and valve timing component wear. no need for WOT accell. this value will re-learn on it's own after the first few decellerations. it will not set DTC's.

[frank29]

no such thing as MDS recalibrationHey, I admit there is confusion:
1) 2005 300C owner's manual doesn't mention it;2006 300C owner's manual does; other Chrysler products do mention it
2) TSB #08-013-04 dated 3-23-04 specifies a particular procedure to reset MDS
3) TSB #08-013-04A dated 4-6-04 replaces the original and all mention of MDS reset was removed

what you did is an adaptive numerator re-learn.I can accept that. What is important to me is my two months of terrible mileage came to a screeching halt when I followed the procedure described in the second posting of this thread.

this value will re-learn on it's own after the first few decellerationsMy car is a slow learner. 2,000 miles wouldn't do the job; the reset procedure did the job instantly.

If anyone with the 5.7 has noticed a deterioration in mileage with no change in driving type, try the procedure.

[fnkychkn]

Hey, I admit there is confusion:
1) 2005 300C owner's manual doesn't mention it;2006 300C owner's manual does; other Chrysler products do mention it
2) TSB #08-013-04 dated 3-23-04 specifies a particular procedure to reset MDS
3) TSB #08-013-04A dated 4-6-04 replaces the original and all mention of MDS reset was removed.
my only source of TSBs is techconnect. when a TSB is revised, all previous versions are deleted. i thought i recalled that procedure, but when i looked for it, i could not find it. so i thought i just imagined it.

sorry for the wrong info. i just read TSB 08-013-04, the original version, from CoolVanilla's download site (thanks CV), and sure enough it says to recalibrate MDS. maybe they removed that part because too many techs were out there beating the crap out of customers cars :lol:

[BrilliantBlackHemi]

If you don't want to disconnect the battery and have the Sat Radio update stations and then have to perform these reconnect procedures, but you still want the computers to reset to factory for performance improvement, what fuse can you remove to accomplish this without the radio preset/station losses?

[Meister]

If you don't want to disconnect the battery and have the Sat Radio update stations and then have to perform these reconnect procedures, but you still want the computers to reset to factory for performance improvement, what fuse can you remove to accomplish this without the radio preset/station losses?
GREAT question, BBH.

OK, who has the schematic?

[fnkychkn]

fuse 11 (15 amp) in IPM will remove B+ from PCM

[Meister]

fuse 11 (15 amp) in IPM will remove B+ from PCM
Bless you, oh mighty chicken.

I'm off to pull a fuse.

[RandomAccess]

Very cool... Thanks FC... Great thinking BBH...

Will pulling this fuse reset the trip meters and MPG etc...

[fnkychkn]

Will pulling this fuse reset the trip meters and MPG etc...
it shouldn't because that information is stored in CCN and/or EVIC

[BrilliantBlackHemi]

Ok, I see it now. Thanks. It's listed on 8W-30-5 and 8W-13-15 in the service manual and this is a fuse in the Integrated Power Module (under the hood). Also the illustrious fuse 17 is in the same unit removing power from the Anti-lock brake module (8W-35-2 and 8W-13-27)

[Meister]

fuse 11 (15 amp) in IPM will remove B+ from PCM
Should we not also pull fuse 14 ("Powertrain Control Module" in the '05 C manual) while we're at it, FC?

[fnkychkn]

Should we not also pull fuse 14 ("Powertrain Control Module" in the '05 C manual) while we're at it, FC?
no need. once powered down, the PCM cannot actuate ASD relay.

[Meister]

no need. once powered down, the PCM cannot actuate ASD relay.
Thanks--that keeps it simple.

[Von Doom]

Quick Questions guys.

Does my ESP need to be recalibrated on a 2006 Dodge Magnum R/T RWD? I left my battery disconnected for about 10 minutes.

I checked fuse #11 under the hood and it was a 20amp and not a 15amp.

Am I supposed to be looking at the fuse box under the hood or the one next to the battery?

[fnkychkn]

the only component of ESP that needs recalibration after battery disconnect is the steering angle sensor (see first post for instructions).

under hood fuse box. fuse 11 is 20 amp.

[Von Doom]

Thanks FnkyChkn. I did the recalibration procedure and the steering feels better (hope I did it right!)

Fuse #11 is a 20Amp in my car but I thought I read earlier that someone said it was a 15amp. Just wanted to be sure.

Thanks!

[bookeem]

i"ll be installing my new REF radio with aux in today, and thanks to this forum/article i will be able to do everything properly, as far as the battery re-connect procedure..i was actually just gonna swap the radios, with out disconnecting the negative battery terminal, but i see its highly suggested that i do..so i will, lol

will i see/feel any behaviour changes with the car after the battery is reconnected, that resets the computer correct?

[X E Ryder]

WOW! This is great info! Thanks all who contributed!

[Dimon]

ELECTRONIC STABILITY PROGRAM (ESP)
If the vehicle is equipped with ESP, once the battery is reconnected, the Steering Angle Sensor (SAS) needs to be
calibrated. The SAS requires calibration anytime the battery or an ABS (ESP) component has been disconnected for
any length of time. To calibrate, perform the following:
1. Start the engine.
2. Center the steering wheel.
3. Turn the steering wheel all the way to the left until the internal stop in the steering gear is met, then turn the
wheel all the way to the right until the opposite internal stop in the steering gear is met.
4. Center the steering wheel.
5. Stop the engine.DMAG, I have bought the Haynes Repair Manual on eBay and it is written there that:

the following procedure does not apply to 2007 models, on which the SAS must be recalibrated with a factory scan tool. If the SAS is not recalibrated immediately after reconnecting the battery or reconnecting an ABS component, the ESP/SAS indicator lamp will flash continuously until the SAS is recalibrated, though it won't set any Diagnostic Trouble Codes (DTCs).Don't you know is this true? If it is, then I'll only have to visit my dealer to recalibrate the SAS after making the FREE Auto-Headlights (no parts needed) upgrade. :sad:

[bigfuchs44]

I am aware of the need to recalibrate the auto up window and the ESP when battery is disconnected but I want to know if you supply power from a secondary source would you still need to go through the procedures?

[fnkychkn]

I am aware of the need to recalibrate the auto up window and the ESP when battery is disconnected but I want to know if you supply power from a secondary source would you still need to go through the procedures?
the point behind disconnecting the battery is to remove the voltage source. supplying power from a different source kinda defeats the purpose.

[JRB73IN]

Ok, I tried that mds thing twice and still can't get it to work, got any other ideas??