TEST ACTION APPLICABILITY
2 Turn the ignition off.
Disconnect the PCM 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.
Turn the ignition to run.
Using a 12-volt test light connected to ground, probe the (F12) Fused Ignition Switch
Output (Off-Run-Start) cavity C1-12 circuit at the appropriate terminal of thespecial
tool #8815.
NOTE: If the test light illuminates, wiggle the wiring harness to ensure that
the problem is not an intermittent wiring problem.
Does the test light illuminate brightly?
All
Yes → Go To 3
No → Check all related fuses. Repair the (F12) Fused Ignition Switch
Output circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
3 Note: Determine which modules this vehicle is equipped with before begin-
ning.
Note: When attempting to communicate with any of the modules on this
vehicle, the DRB will display 1 of 2 different communication errors: a NO
RESPONSE message or a BUS +/- SIGNALS OPEN message.
Turn the ignition on.
Using the DRB, attempt to communicate with the following control modules:
Instrument Cluster (MIC)
Controller Antilock Brake (CAB)
Was the DRB able to communicate with one or more Module(s)?
All
Yes → Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No → Refer to the Communication category and perform the PCI BUS
COMMUNICATION FAILURE symptom.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
286
DRIVEABILITY - NGC
U0101-NO TRANSMISSION BUS MESSAGE — Continued
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