Chrysler Pacifica CS 2004 Service Manual page 34

COMMUNICATION
*PCI BUS COMMUNICATION FAILURE —
TEST
3 Turn the ignition off.
Disconnect the PCM harness connectors.
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.
Disconnect the DRB from the Data Link Connector (DLC).
Disconnect the negative battery cable.
Measure the resistance of the PCI Bus circuit between the Data Link Connector
(DLC) and the PCM harness connector.
Is the resistance below 5.0 ohms?
Yes → Go To 4
→ Repair the PCI Bus circuit for an open.
No
4 NOTE: Reconnect the PCM harness connector and the negative battery
cable.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit at the Data Link Connector (DLC).
Is the voltage above 7.0 volts?
Yes → Go To 5
→ Go To 6
No
5 Turn the ignition off.
Using a voltmeter, connect one end to the PCI Bus circuit at the DLC, and the other
end to ground.
Note: When performing the next step turn the ignition off (wait one minute)
before disconnecting any module. When the module is disconnected turn
the ignition on to check for a short to voltage.
Turn the ignition on.
While monitoring the voltmeter, disconnect each module the vehicle is equipped with
one at a time.
Is the voltage steadily above 7.0 volts with all the modules disconnected?
Yes → Repair the PCI Bus circuit for a short to voltage.
→ Replace the module that when disconnected the short to voltage
No
ACTION
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
was eliminated.
Perform BODY VERIFICATION TEST - VER 1.
Continued
28
APPLICABILITY
All
All
All