P1684-BATTERY WAS DISCONNECTED

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The PCM uses a battery backed RAM (Random Access Memory) is used to maintain some learned values. When the battery B(+) is disconnected, the memory is lost. When the B(+) is restored, this memory loss is detected by the Transmission Control System. The DTC is set and the learned values are initialized to known constants or previously learned values from EEPROM (Electronic Erasable Programmable Read Only Memory). This results in the reinitialization of some parameters.


  • When Monitored:

    Whenever the ignition is in the Run/Start position.

  • Set Condition:

    This DTC will set whenever Powertrain Control Module is disconnected from Fused B(+) or ground. It will also be set using the scan tool to perform a Battery Disconnect and/or Quick Learn procedure.


Possible Causes
  
BATTERY WAS DISCONNECTED
  
SCAN TOOL BATTERY DISCONNECT PERFORMED
  
PCM WAS REPLACED OR DISCONNECTED
  
QUICK LEARN WAS PERFORMED
  

Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting Procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)



Diagnostic Test

1.POSSIBLE CAUSES









Were any of the above possible causes performed?

Yes


No
  • Go To2

2.CHECK WIRING AND CONNECTORS



NOTE: Check all power and ground circuits to the PCM for a intermittent or high resistance condition.





Where there any problems found?

Yes


No
  • Test Complete.