PCI Bus Communication Failure
NOTE:
Determine modules vehicle is equipped with before performing diagnostic procedure.
NOTE:
After making any repairs, perform BODY VERIFICATION TEST
under VERIFICATION TESTS.
- Connect Diagnostic Junction Port Tester (8339) to diagnostic junction port and scan tool. See COMPONENT LOCATIONS . Using scan tool, select JUNCTION PORT TOOL then PCI BUS MODULE SCAN and follow on screen instructions. If scan tool does not communicate with any modules, go to next step. If scan tool communicates with any modules on vehicle, go to appropriate diagnostic procedure for modules not responding. See SYMPTOM IDENTIFICATION table under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition off. Disconnect scan tool from Data Link Connector (DLC). Using DVOM, measure resistance of White/Violet wire between DLC terminal No. 2 and diagnostic junction port terminal No. 7. See Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in White/Violet wire.
- Reconnect scan tool to DLC. Connect diagnostic junction port tester to diagnostic junction port and scan tool. Using scan tool, select JUNCTION PORT TOOL then PCI BUS MODULE SCAN and follow on screen instructions. If scan tool displays NO MODULES RESPONDING from any pins that were scanned, go to next step. If scan tool does not display NO MODULES RESPONDING from any pins that were scanned, check for open or short to ground in White/Violet wire between DLC and diagnostic junction port. Repair as necessary.
- Disconnect junction port tester from scan tool. Turn ignition on. Measure voltage at junction port tester terminal for suspect module(s) displaying NO MODULES RESPONDING. See DIAGNOSTIC JUNCTION PORT TERMINAL IDENTIFICATION table. If voltage is approximately 7 volts, go to next step. If voltage not approximately 7 volts, go to step 6 .
- If suspect module is located on circuit for terminals No. 1, 3, 9 or 12, monitor DVOM while disconnecting each module connector one at a time. With DVOM still connected to junction port tester, turn ignition off and disconnect suspect module connector. If voltage is approximately 7 volts when module is disconnected, repair short to voltage in PCI bus wire for suspect module. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If voltage is not approximately 7 volts, replace suspect module.
- Turn ignition off. Disconnect negative battery cable. Using DVOM, measure resistance between junction port terminal of suspect module(s) displaying NO MODULES RESPONDING and ground. If resistance is 100 ohms or less, go to next step. If resistance is greater than 100 ohms, go to step 8 .
- If suspect module is located on circuit for terminals No. 1, 3, 9 or 12, monitor DVOM while disconnecting each module connector one at a time. With DVOM still connected to junction port tester, disconnect suspect module connector. If resistance is 100 ohms or less when module is disconnected, repair short to ground in PCI bus wire for suspect module. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If resistance is greater than 100 ohms, replace suspect module.
- Visually inspect suspect module harness and connectors for signs of damage. Check for intermittent poor connections or faulty circuits. Repair as necessary. If circuits and connectors are okay, test is complete.
DIAGNOSTIC JUNCTION PORT TERMINAL IDENTIFICATION
| Terminal No. (1) | Module | ||
|---|---|---|---|
| 1 | Powertrain Control Module/Sentry Key Immobilizer Module | ||
| 2 | Manual & Automatic Air Conditioning | ||
| 3 | Radio | ||
| 4 | Occupant Restraint Controller (Air Bag) | ||
| 5 | Instrument Cluster | ||
| 6 | Body Control Module | ||
| 7 | Data Link Connector | ||
| 8 | Overhead Console | ||
| 9 | Intelligent Power Module (Front Control Module)/Controller Anti-Lock Brake/Transmission Control Module | ||
| 10 | Left Side Impact Air Bag Control Module | ||
| 11 | Memory Seat/Mirror Module | ||
| 12 | Power Sliding Door/Power Liftgate | ||
| 13 | Right Side Impact Air Bag Control Module | ||
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