Ok i found some information pertaining to this and other related issues. You may want to give it a read, it will tell you where to start.
if anybody has changed the car stereo... or added an Ipod adaptor to it.. where the harness plugs into the back of the radio...
what do the letters mean..
DTC.. diagnostic trouble code
DRB the advance scan tool that works with chrysler built cars and trucks..
P-1686 NO SKIM BUS MESSAGE RECEIVED
When Monitored and Set Condition:
P-1686 NO SKIM BUS MESSAGE RECEIVED
When Monitored: With the ignition on.
Set Condition: The PCM does not receive a CCD Bus message from the SKIM when
expected.
POSSIBLE CAUSES
PCM
INTERMITTENT CONDITION
CCD BUS CIRCUIT(S) OPEN FROM PCM TO SKIM
LOSS OF SKIM COMMUNICATION
conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running and at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for parameter
values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
there have been broken wires found in the rubber boots between the door jam and the doors...
i should explain.. THE WHOLE jeep is wired with computer signals.. to operate devices..
go through and identify exactly .. WHAT DOES NOT WORK PROPERLY..
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
P1687 No Communication with the MIC
No BUS messages received from the Mechanical
Instrument Cluster (MIC) for approximately 25 seconds.
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Symptom List:
P1698-NO BUS MESSAGE FROM TRANS CONTROL MODULE
P1698-NO BUS MESSAGE FROM TCM
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1698-NO BUS MESSAGE FROM
TRANS CONTROL MODULE.
When Monitored and Set Condition:
P1698-NO BUS MESSAGE FROM TRANS CONTROL MODULE
When Monitored: Equipped with automatic transmission, the ignition key on, engine
running, transmission in drive, vehicle road speed and battery voltage greater than 10
volts.
Set Condition: No bus messages from the TCM for 10 seconds, two trips required.
POSSIBLE CAUSES
INTERMITTENT CONDITION
COMMUNICATE WITH TCM
PCM
before replacing ANYThing.. identifying anything that does not work properly ... then go to the EXACT factory service manual...
be cause of the failure could be a LOT of things..
with a factory service manual in print.. or a digital version on some tablet .. and some advanced scan tool that will talk to the CAN system... ONLY using a digital volt meter and a LOGIC PROBE.. NEVER a test light... and knowing what connector you are about to probe..
identify what does not work.. use the scan tool to test that circuit.. you might also want to just check the connectors.. the grounds.. the relays... the IGNITION Switch..
intermittents are hard to find.. takes 2 days.. to set a code.. what exactly were you doing when the code set...
warning.. a lot of shops start with the expensive stuff.. and work toward the cheep stuff.. diagnosis of the spider web of CAN controlled circuits.. and careful monitoring of each of them ..
if you don't have a decent scan tool.. and you cannot find any broken wires.. you will probably want to buy the factory service manual.. and possibly an OTC scan tool.. #3499N.. as not all the consumer scan tools will do what you need to .. and the ads won't say that they don't..
it may need a trained tech before it is all said and done if you do not have the needed tools.
P1698 Jeep PCM Fault No CCD Message From TCM The alternator is controlled by the PCM - engine computer >
How to test an alternator Chrysler Dodge Jeep
SOURCE: Check engine light on.
Replace O2 sensor. They have to be really hot in order to read right. Did you ensure to drive around a good 30 min to make it hot?
SOURCE: 1999 Jeep G C Quadra Trac keeps getting stuck in 4 wheel drive.
universal joint on the driveshaft may do this !
check transmission fluide as well.
good luck
SOURCE: 93 Jeep Grand Cherokee Won't start
The crankshaft position sensor was seriously problematic in those old jeeps. It's located towards the top of the bell housing slightly to the driver's side I think.
SOURCE: 2000 Jeep Cherokee engine light stays on
HAVE YOU REPLACED THAT PLUG AND PLUG WIRE,FIND NO3 CYLINDER AND PULL THAT WIRE OFF SEE IF ILDE OF ENGINE CHANGES IF NO THEN YOU MAY HAVE BIGGER PROBLEM BUT DEFINITELY CHECK FOR SPARK WITH WIRE ON PLUG ITSELF.
SOURCE: How to replace sparl plugs on a Jeep Cherokee?
Hello, I hope this info helps...(subytech1)...REMOVAL
In this engine, each individual spark plug is located under each ignition coil.
CLEANING
Theplugs may be cleaned using commercially available spark plug cleaningequipment. After cleaning, file center electrode flat with a smallpoint file or jewelers file before adjusting gap.
CAUTION: Never use a motorized wire wheel brush to clean sparkplugs. Metallic deposits will remain on spark plug insulator and willcause plug misfire.
ADJUSTMENT
Setting Spark Plug Gap - Typical
Check spark plug gap with a gap gauge tool. If the gap is not correct,adjust it by bending ground electrode. Never attempt to adjust gap bybending center electrode.
INSTALLATION
CAUTION: This engine is equipped with copper core groundelectrode spark plugs. They must be replaced with the same type/numberspark plug as the original. If another spark plug is substituted,pre-ignition will result.
Special care should be taken when installing spark plugs into cylinderhead spark plug wells. Be sure plugs do not drop into plug wells asground straps may be bent resulting in a change in plug gap, orelectrodes can be damaged.
Always tighten spark plugs to specified torque. Over tightening cancause distortion resulting in a change in spark plug gap or a crackedporcelain insulator.
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