DTC P1397: WSSD Rough Road - Serial Data Fault: Troubleshooting

TROUBLESHOOTING CHART

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (OBD II) System Check. Is the system check complete?	-	Go to Step 2	Go to On-Board Diagnostic (OBD II) System Check
2	Turn the ignition ON, with the engine OFF. Install a scan tool. Are any additional Diagnostic Trouble Codes (DTCs) set?	-	Go to applicable DTC table	Go to Step 3
3	Review and record the scan tool Failure Records data. Operate the vehicle within Failure Records conditions as noted. Using the scan tool, monitor specific DTC info for DTC P1391. Does the scan tool indicate that DTC P1391 failed?	-	Go to Step 4	Go to Diagnostic Aids
4	Turn the ignition OFF. Disconnect the Engine Control Module (ECM) and check for an open or short in the wire between ECM connector terminal C64 and Electronic Brake Control Module (EBCM) connector terminal 23. Is the problem found?	-	Go to Step 5	Go to Step 6
5	Repair an open or short in the wire between ECM connector terminal C64 and EBCM connector terminal 23. Is the repair complete?	-	Go to Step 7	-
6	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 7	-
7	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 8	Go to Step 2
8	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK