LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 491 (Body Diagnostic Procedures) >> Diagnostic Information And Procedures >> Communication >> Symptom: *PCI BUS COMMUNICATION FAILURE >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - *PCI BUS COMMUNICATION FAILURE

TEST ACTION APPLICABILITY
1
NOTE: Determine which modules this vehicle is equipped with before beginning.
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:Airbag Control ModuleBody Control ModuleMIC (INSTRUMENT CLUSTER)Was the DRBIII® able to communicate with one or more Module(s)?Yes --> Go To 2No --> Go To 3		 All
2 Turn the ignition off.
NOTE: Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
NOTE: Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
NOTE: If the DRB can not communicate with a single module, refer to the related symptom.

Were any problems found?
Yes --> Repair wiring harness/connectors as necessary.
Perform BODY VERIFICATION TEST - VER 1  .
No --> Test Complete.		 All
3 Turn the ignition off.
Disconnect the BCM C1 harness connector.
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 BCM harness connector.
Is the resistance below 5.0 ohms?
Yes --> Go To 4
No --> Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1  .		 All
4
NOTE: Reconnect the BCM 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 5No --> Go To 6		 All
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.
Perform BODY VERIFICATION TEST - VER 1  .
No --> Replace the module that when disconnected the short to voltage was eliminated.
Perform BODY VERIFICATION TEST - VER 1  .		 All
6 Turn the ignition off.
Disconnect the negative battery cable.
Using a ohmmeter, connect one end to the PCI Bus circuit at the DLC, and the other end to ground.
While monitoring the ohmmeter, disconnect each module the vehicle is equipped with one at a time.
NOTE: Total bus resistance to ground thru all of the modules is typically between 350 to 1000 ohms. The more modules on the bus, the lower the total bus resistance will be.

Is the resistance below 150.0 ohms with all the modules disconnected?
Yes --> Repair the PCI Bus circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1  .
No --> Replace the module that when disconnected the short to ground was eliminated.
Perform BODY VERIFICATION TEST - VER 1  .		 All
scientia non olet · About LEMON Manuals