Jeep XJ. Manual — part 818
Symptom:
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
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB III
t, read PCM DTCs. LOOK for P1686.
Is the Starts Since Set counter for DTC P1686 displayed and equal to 0?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRB III
t, attempt to communicate with the SKIM.
With the DRB III
t, select Theft Alarm and read the SKIM DTCs.
NOTE: This test will indicate if the Bus is operational from the DLC to the
SKIM.
Can the DRB communicate with the SKIM?
All
Yes
→
No
→
Refer to the appropriate symptom in the COMMUNICATION
category.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the SKIM harness connector.
Measure the resistance of both CCD Bus circuits between the PCM and the SKIM.
Is the resistance below 5.0 ohms for each measurement?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the CCD Bus circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
33
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The 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 param-
eter 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?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
34
COMMUNICATION
P-1686 NO SKIM BUS MESSAGE RECEIVED —
Continued
Symptom List:
P0600-PCM FAILURE SPI COMMUNICATIONS
P0601-PCM INTERNAL CONTROLLER FAILURE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0600-PCM FAILURE SPI
COMMUNICATIONS.
POSSIBLE CAUSES
PCM
TEST
ACTION
APPLICABILITY
1
The Powertrain Control Module is reporting internal errors and must be replaced.
View repair
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
35
COMMUNICATION
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
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Cycle the ignition key on and off several times.
With the DRBIII
t, read DTC’s.
Does the DTC reset?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the TCM.
Can communication be established with the TCM?
All
Yes
→
Replace and program the Powertrain Control Module Module in
accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER-1.
No
→
Refer to the Communication Category and perform the appropri-
ate symptom related to no communication with TCM.
Perform POWERTRAIN VERIFICATION TEST VER-1.
36
COMMUNICATION
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