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2000 grand cherokee sentry key system problems

 
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kopper66 kopper66
New User | Posts: 2 | Joined: 04/12
Posted: 04/17/12
12:49 PM

My Sentry light flashes at different times (when I start the vehicle) and when it does the engine starts and then shuts down after about 2 - 3 seconds.  When it first occurred I would let it sit for about 10 minutes and then the engine would start and run fine.  It would run fine for a few days and then it would occur again.  Soon, it took about 1/2 hour until it was able to run.  Then one hour.  Now it has been two days and it is back to the engine running for 2-3 seconds and then shuts down.  

Frustrating to say the least.  I am getting it to a Jeep dealership soon, either by tow or a miraculous start.  Any ideas would be most appreciated.  

waynep71222 waynep71222
Guru | Posts: 823 | Joined: 03/12
Posted: 04/17/12
01:48 PM

check the codes.. its easy.. three times on in under 10 seconds..

turn the ignition key ON and off.. ON and off.. ON and off.. ON and off then ON  the odometer will change from miles you have driven to codes...   write them down..

something is probably wrong in the alarm system..

get codes..    get codes from it when it has failed..

you don't need a scan tool to get the codes..

post the codes... not the description..    P1234. like that..

google the codes..

do you have a digital volt meter..  if you could get it running i have a 2 minute test..

i would want to check the ground connectors between the battery negative and the body and the engine..   usually on jeeps.. the engine ground connections are on the sides of the engine near the transmission bell housing..   you will also want to clean the ground from the negative cable where it leads down to the frame/chassis..  bad  grounds will drive you crazy..

read codes before disconnecting the battery..  

kopper66 kopper66
New User | Posts: 2 | Joined: 04/12
Posted: 04/17/12
05:24 PM

Just checked the code and it is P1685.  If I'm not mistaken that possibly means there is a wiring problem from the SKIM to the Engine Control Module???  

waynep71222 waynep71222
Guru | Posts: 823 | Joined: 03/12
Posted: 04/17/12
06:11 PM

SKIM    INVALID KEY....    more to come...

got a different key...

take all the other keys off your key ring...  you might have a second key that is getting picked up.....  

waynep71222 waynep71222
Guru | Posts: 823 | Joined: 03/12
Posted: 04/17/12
06:18 PM

P1685-WRONG OR INVALID KEY MSG RECEIVED FROM SKIM
When Monitored and Set Condition:
P1685-WRONG OR INVALID KEY MSG RECEIVED FROM SKIM
When Monitored: With the ignition on.
Set Condition: The PCM does not receive a Valid Key message from the SKIM.
POSSIBLE CAUSES
INCORRECT VIN IN PCM
INVALID SKIM KEY NOT PRESENT
NO COMMUNICATION WITH SKIM
NO VIN PROGRAMMED IN THE PCM
PCM
SKIM TROUBLE CODES SET
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB III, read the PCM DTCs. Look for P1685.
Is the Starts Since Set counter for DTC P1685 displayed and equal to 0?
All
Yes ® Go To 2
No ® Go To 7
2 With the DRB III, attempt to communicate with the SKIM.
Turn the ignition on.
Can the DRB III communicate with the SKIM?
All
Yes ® Go To 3
No ® Refer to symptom BUS +/- SIGNAL OPEN FROM SKIM in the
COMMUNICATION category.
3 Turn the ignition on.
With the DRB III, check for SKIM DTCs.
Are any DTCs present in the SKIM?
All
Yes ® Repair all SKIM DTCs.
Perform SKIS VERIFICATION TEST.
No ® Go To 4
4 Turn the ignition on.
With the DRB III, display the VIN that is programmed in the PCM.
Has a VIN been programmed into the PCM?
All
Yes ® Go To 5
No ® Program the correct VIN into the PCM and retest.
Perform SKIS VERIFICATION TEST.

5 Turn the ignition on.
With the DRB III, display the VIN that is programmed in the PCM.
Was the correct VIN programmed into the PCM?
All
Yes ® Go To 6
No ® Replace and program the Powertrain Control Module in accordance
with the Service Information.
Perform SKIS VERIFICATION TEST.
6 Turn the ignition off.
Replace and program the Sentry Key Immobilizer Module in accordance with the
Service Information.
Turn the ignition on.
With the DRB III, erase all SKIM and PCM DTCs.
Attempt to start and idle the engine.
With the DRB III, read the PCM DTCs.
Does the DRB III display this code?
All
Yes ® Replace and program the Powertrain Control Module in accordance
with the Service Information.
Perform SKIS VERIFICATION TEST.
No ® Test Complete.
7 NOTE: This DTC could have been set if the SKIM harness connector was
disconnected, or if the SKIM was replaced recently.
NOTE: All keys that the customer uses for this vehicle must be tested to
verify they are operating properly.
Turn the ignition on.
Verify the correct VIN is programmed into the PCM and SKIM.
Turn the ignition off.
With the next customer key turn the ignition key on and crank the engine to start.
With the DRB III, read the PCM DTCs. Look for P1685
Is the Starts Since Set counter for DTC P1685 displayed and equal to 0?
All
Yes ® Replace the Ignition Key.
Perform SKIS VERIFICATION TEST.
No ® Test Complete.
NOTE: If this DTC cannot be reset, it could have been an actual theft
attempt.  

waynep71222 waynep71222
Guru | Posts: 823 | Joined: 03/12
Posted: 04/17/12
06:20 PM

again... try a different key...    alone in the ignition lock cylinder...

more to come while i research..  

waynep71222 waynep71222
Guru | Posts: 823 | Joined: 03/12
Posted: 04/17/12
06:30 PM

Sentry Key Immobilizer Module - The Sentry
Key Immobilizer Module (SKIM) is located on the
right side of the steering column near the ignition
lock cylinder housing and an integral molded plastic
antenna ring circles the ignition lock cylinder like a
halo. The SKIM and its antenna are concealed
beneath the steering column shrouds.
† Sentry Key Transponder - The Sentry Key
transponder is molded into the head of the ignition
key, and concealed by a gray molded rubber cap.
† Security Indicator - The security indicator is
located in the Information Center area of the instrument
cluster, to the left of center. (Refer to 8 - ELECTRICAL/
INSTRUMENT CLUSTER/SECURITY
INDICATOR - DESCRIPTION).
Except for the Sentry Key transponders, which rely
upon Radio Frequency (RF) communication, hard
wired circuitry connects the SKIS components to the
electrical system of the vehicle. These hard wired circuits
are integral to several wire harnesses, which
are routed throughout the vehicle and retained by
many different methods. These circuits may be connected
to each other, to the vehicle electrical system
and to the SKIS components through the use of a
combination of soldered splices, splice block connectors,
and many different types of wire harness terminal
connectors and insulators. Refer to the
appropriate wiring information. The wiring information
includes wiring diagrams, proper wire and connector
repair procedures, further details on wire
harness routing and retention, as well as pin-out and
location views for the various wire harness connectors,
splices and grounds.  

waynep71222 waynep71222
Guru | Posts: 823 | Joined: 03/12
Posted: 04/17/12
06:39 PM

log in... check messages to the left of where you log out at..  

rodsstang rodsstang
New User | Posts: 1 | Joined: 12/14
Posted: 12/12/14
06:48 PM

Go to car forums at Edmunds.com, there are quite a few people with the same issue as you are having. Several have found that high resistance at the Battery connections causes problems in the SKIM  anti theft system. cleaning the battery connections seems to fix their issues. Others find connection issues at the IGN switch and between the SKIM and PCM.  

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