Dodge Dakota (R1). Manual — part 826
Symptom:
P1686-NO SKIM BUS MESSAGE RECEIVED
When Monitored and Set Condition:
P1686-NO SKIM BUS MESSAGE RECEIVED
When Monitored:
With the ignition on.
Set Condition:
The PCM does not receive a Bus message from the SKIM when expected.
POSSIBLE CAUSES
SKIM/PCM
INTERMITTENT CONDITION
LOSS OF SKIM COMMUNICATION
PCI BUS CIRCUIT OPEN FROM PCM TO SKIM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB III
t, read the PCM DTCs. Look for P1686.
Is the Starts Since Set counter on the DTC screen for P1686 equal to Zero?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRB III
t, attempt to communicate with the SKIM.
NOTE: This test will indicate if the Bus is operational from the DLC to the
SKIM.
Was the DRB III
t able to communicate with the SKIM?
All
Yes
→
No
→
Refer to symptom BUS +/- SIGNAL OPEN FROM SKIM in the
COMMUNICATION category.
Perform SKIS VERIFICATION.
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the SKIM harness connector.
Measure the resistance of the PCI Bus circuit between the PCM harness connector
and the SKIM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the PCI Bus circuit between the PCM and the SKIM for an
open.
Perform SKIS VERIFICATION.
36
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Replace the Sentry Key Immobilizer Module in accordance with the Service Infor-
mation.
Turn the ignition on.
Display and erase all PCM and SKIM DTCs.
Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle.
With the DRB III
t, display PCM DTCs.
Does the DRB III
t display the same DTC?
All
Yes
→
Replace and program the PCM in accordance with the Service
Information.
Perform SKIS VERIFICATION.
No
→
Test Complete.
5
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 SKIS VERIFICATION.
No
→
Test Complete.
37
COMMUNICATION
P1686-NO SKIM BUS MESSAGE RECEIVED —
Continued
Symptom:
P1687-NO CLUSTER BUS MESSAGE
When Monitored and Set Condition:
P1687-NO CLUSTER BUS MESSAGE
When Monitored:
With the ignition on.
Set Condition:
The PCM does not receive an expected Cluster Status Bus message from
the instrument cluster within the last 20 seconds.
POSSIBLE CAUSES
CHECKING CLUSTER COMMUNICATION
PCI BUS CIRCUIT OPEN
PCM - INTERNAL FAILURE
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB III
t, erase PCM DTCs.
Cycle the ignition key on and off several times, leaving the key on for at least 10
seconds at a time.
With the DRB III
t, read PCM DTCs.
Did the DTC reset?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRB III
t, attempt to communicate with the Instrument Cluster.
Can the DRB III
t communicate with the Instrument Cluster?
All
Yes
→
No
→
Refer to COMMUNICATION for the related symptom(s).
Perform ROAD TEST VERTIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Instrument Cluster harness connector.
Measure the resistance of the PCI Bus circuit between the PCM harness connector
and the Instrument Cluster harness connector.
Is the resistance below 5.0 ohms?
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 PCI Bus circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
38
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
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.
39
COMMUNICATION
P1687-NO CLUSTER BUS MESSAGE —
Continued
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