Scan Tool: OBDLink SX Scan Tool
Operating System: Microsoft Windows XP Professional 32 Bit
Version: 5.1.2600 Service Pack 3 Build 2600
Vehicle: 1999 Jeep Grand Cherokee (6 cylinder) USA
Engine: 6 cylinder gas, 242 cu. in. (4.0 liters)
Software: OBDwiz Version: 18.104.22.1682
ScanTool Fault: Connection of scan tool to vehicle PCM was not successful. Message says only that there was an error experienced in the attempt to connect. In response to error correction prompts, we can confirm that:
1. The scan tool was connected properly.
2. The vehicle ignition was set to ON. (The engine will not run. The starter engages and turns the engine over but there appears to be no fuel and we assume no ignition?)
3. Connection Settings are correct between tool and laptop and we have successfully connected with a 2004 Chrysler Pacifica previously.
Vehicle Problem: 1999 Jeep Grand Cherokee will not start after normal shutdown. The instrument cluster is not responsive (i.e.: when in run position the fuel gauge registers nothing - fuel warning light is on [there is gas in tank]. Check instruments light is on. After the attempt at connecting the scan tool, the check engine light comes on). Suspect that the PCM has crashed since it will not connect with the scan tool?
Any suggestions as to how to affect connection with the PCM? Will direct short in Crank Position Sensor or other input cause complete shutdown of PCM?