PCI BUS Communication Failure

Possible Causes are:

• USING THE DRBIII(R), PERFORM A MODULE SCAN
• OPEN PCI BUS CIRCUIT AT THE DATA LINK CONNECTOR
• USING THE DRBIII(R), PERFORM THE PCI BUS CONTROL MODE
• DISCONNECTED MODULE(S) HARNESS CONNECTOR
• PCI BUS CIRCUIT SHORTED TO VOLTAGE
• PCI BUS CIRCUIT SHORTED TO GROUND
• WIRING HARNESS INTERMITTENT FAILURE

1. Connect the Diagnostic Junction Port Tester (No. 8339) to the DRBIII(R) and to the Diagnostic Junction Port. Using the DRBIII(R), along with the Diagnostic Junction Port Tester, select Junction Port Tool then PCI Bus Module Scan and follow the instructions on the DRBIII(R). Was the DRBIII(R) able to scan (I/D or communicate) with any modules? If yes, refer to the Communication category for the related symptoms (Individual module no responses). Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, go to next step.
2. Turn ignition off. Measure the resistance of the PCI Bus circuit between the Data Link Connector and the Diagnostic Junction Port connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the PCI Bus circuit for an open between the DLC and the Diagnostic Junction Port. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
3. Connect the Diagnostic Junction Port Tester to the DRBIII(R) and to the Diagnostic Junction Port. Using the DRBIII(R), along with the Diagnostic Junction Port Tester, select Junction Port Tool then PCI Bus Control Mode and follow the instructions on the DRBIII(R). Perform this function on each pin that is equipped with a PCI Bus circuit. Did the DRBIII(R) display No Modules Responding from any of the pins that were scanned? If yes, go to next step. If no, check the PCI Bus circuit between the DLC and the Diagnostic Junction Port connector for a short to voltage or to ground, repair as necessary. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
4. Disconnect the Diagnostic Junction Port Tester cable from the DRBIII(R). Keep the tester connected to the Diagnostic Junction Port. Turn ignition on. Measure the voltage of the PCI Bus circuit on the Diagnostic Junction Port Tester that the DRBIII(R) displayed No Modules Responding. Is the voltage steadily more than 7 volts? If yes, go to next step. If no, go to step  6 .
5. Measure the voltage of the PCI Bus circuit on the Diagnostic Junction Port tester that previously measured more than 7 volts. Turn the ignition off before disconnecting any module harness connector then Turn ignition on. Disconnect the module harness connector(s). If the problem occurred on a bus circuit that has more than one module on the same circuit, observe the voltmeter while disconnecting each module connector one at a time. Is the voltage steadily more than 7 volts with the module(s) disconnected? If yes, repair the PCI Bus circuit that measured over 7 volts for a short to voltage. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, replace the module that when disconnected the short to voltage was eliminated. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
6. Disconnect the Diagnostic Junction Port Tester cable from the DRBIII(R). Keep the tester connected to the Diagnostic Junction Port. Turn 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 DRBIII(R) displayed No Modules Responding. Is the resistance less than 100 ohms? If yes, go to next step. If no, go to step  8 .
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 less than 100 ohms. Disconnect the module harness connector(s). If the problem occurred on a bus circuit that has more than one module on the same circuit, observe the ohmmeter while disconnecting each module connector one at a time. Is the resistance less than 100 ohms with the module(s) disconnected? If yes, repair the PCI Bus circuit that measured less than 100 ohms for a short to ground. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, replace the module that when disconnected the short to ground was eliminated. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
8. Turn ignition off. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any problems found? If yes, repair wiring harness/connectors as necessary. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, test is complete.