Fuses are okay and the factory head unit wiring is okay the now engine lights up on the dash and the scan tool say it cant read and just yesterday the coil packs failed and lots of miss fires but not engine light other then this it run great just dont like the fact the obd in not working can anyone help me

 

Symptom:
*PCI BUS COMMUNICATION FAILURE
POSSIBLE CAUSES
WITH THE DRB PERFORM A MODULE SCAN
OPEN PCI BUS CIRCUIT AT THE DATA LINK CONNECTOR
USING THE DRB, PERFORM THE PCI BUS CONTROL MODE
DISCONNECT THE MODULE(S) HARNESS CONNECTOR
PCI BUS CIRCUIT SHORTED TO VOLTAGE
DISCONNECT THE MODULE(S) HARNESS CONNECTOR
PCI BUS CIRCUIT SHORTED TO GROUND
WIRING HARNESS INTERMITTENT FAILURE
TEST ACTION APPLICABILITY
1 Note: Determine which modules this vehicle is equipped with before beginning.
Connect the Diagnostic Junction Port Tester #8339 to the DRB and to the Diagnostic
Junction Port.
Using the DRB, along with the Diagnostic Junction Port Tester #8339, select
Junction Port Tool then PCI Bus Module Scan and follow the instructions on the
DRB.
Was the DRB able to scan (I/D or communicate) with any modules?
All
Yes ® Refer to the Communication category for the related symptom(s).
(Individual module no responses).
Perform BODY VERIFICATION TEST - VER 1.
No ® Go To 2
2 Turn the ignition off.
Measure the resistance of the PCI Bus circuit between the Data Link Connector and
the Diagnostic Junction Port connector.
Is the resistance below 5.0 ohms?
All
Yes ® Go To 3
No ® Repair the PCI Bus circuit for an open between the DLC and the
Diagnostic Junction Port.

 

TEST ACTION APPLICABILITY
3 Note: Determine which modules this vehicle is equipped with before beginning.
Connect the Diagnostic Junction Port Tester #8339 to the DRB and to the Diagnostic
Junction Port.
Using the DRB, along with the Diagnostic Junction Port Tester #8339, select
Junction Port Tool then PCI Bus Control Mode and follow the instructions on the
DRB.
Note: Perform this function on each pin that is equipped with a PCI Bus
circuit.
Did the DRB display No Modules Responding from any of the pins that were
scanned?
All
Yes ® Go To 4
No ® Check the PCI Bus circuit between the DLC and the Diagnostic
Junction Port connector for a short to voltage or to ground.
Perform BODY VERIFICATION TEST - VER 1.
4 Disconnect the Diagnostic Junction Port Tester cable from the DRB. Keep the tester
connected to the Diagnostic Junction Port.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit on the Diagnostic Junction Port Tester
that the DRB displayed No Modules Responding.
Is the voltage steadily above 7.0 volts?
All
Yes ® Go To 5
No ® Go To 6
5 Measure the voltage of the PCI Bus circuit on the Diagnostic Junction Port tester
that previously measured above 7.0 volts.
Note: Turn the ignition off before disconnecting any module harness
connector then turn the ignition on.
Disconnect the module harness connector(s). Note: If the problem occurred on pins 1,
3, 9 or 12 of the Diagnostic Junction Port tester, observe the voltmeter while
disconnecting each module connector one at a time.
Is the voltage steadily above 7.0 volts with the module(s) disconnected?
All
Yes ® Repair the PCI Bus circuit that measured over 7.0 volts 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.
6 Disconnect the Diagnostic Junction Port Tester cable from the DRB. Keep the tester
connected to the Diagnostic Junction Port.
Turn the ignition off.
Disconnect the negative battery cable.
Measure the resistance between ground and the PCI Bus circuit on the Diagnostic
Junction Port Tester that the DRB displayed No Modules Responding.
Is the resistance below 100.0 ohms?
All
Yes ® Go To 7
No ® Go To 8

 

TEST ACTION APPLICABILITY
7 Disconnect the negative battery cable.
Measure the resistance between ground and the PCI Bus circuit at the Diagnostic
Junction Port tester that previously measured below 100.0 ohms.
Disconnect the module harness connector(s). Note: If the problem occurred on pins 1,
3, 9 or 12 of the Diagnostic Junction Port tester, observe the ohmmeter while
disconnecting each module connector one at a time.
Is the resistance below 100.0 ohms with the module(s) disconnected?
All
Yes ® Repair the PCI Bus circuit that measured below 100.0 ohms 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.
8 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.
Were any problems found?
All
Yes ® Repair wiring harness/connectors as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No ® Test Complete.

 

What is the Drb. Is this a special scanner

 

The DRB is what the dealer use's for a scanner. So if you scanner is not powering up, use this information.

 

Thats what i thought that might have been iam using a scanner that have live data and all the fun stuff. so i guess i need a dealer tool for that. I just think its weired that when the turn the key on the engine light dont come on so say its working. i have the that this van has had issues with the computer. i think it was dumb of dodge to put it in the engine bay near the fans. electronics tend to fail quick if exposed to extreme heat. and the coil pack sits right on top of the exiting cooling water for the engine lol. But is there another way to solve the issues with out the dealer tools ?