Symptom:
U0168-NO SKIM BUS MESSAGES
When Monitored and Set Condition:
U0168-NO SKIM BUS MESSAGES
When Monitored: Ignition on or Engine Running.
Set Condition: No BUS messages are received from the SKIM for 20 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
PCI BUS CIRCUIT OPEN FROM PCM TO SKIM
LOSS OF SKIM COMMUNICATION
SKIM/PCM
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read the DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes → Go To 2
No → Go To 5
2 Turn the ignition on.
With the DRB III, 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 able to communicate with the SKIM?
All
Yes → Go To 3
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.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the PCI Bus circuit from the SKIM harness connector to
the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes → Go To 4
No → Repair the PCIBus circuit between the PCM and the SKIM for an
open.
Perform SKIS VERIFICATION.
288
DRIVEABILITY - NGC
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