P1684-BATTERY WAS DISCONNECTED





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


Note: This is not a fault code. It exists to provide reference information only. A battery backed RAM is used to maintain some learned values. When the battery is disconnected, this memory is lost. When the battery is reconnected, the loss of learned values will be detected by the controller. The code will be set and the learned values will be initialized to known constants and the learning process will continue. Setting the code has no effect except for re-initialization of learned values.



Possible Causes
BATTERY WAS DISCONNECTED
PCM WAS REPLACED OR DISCONNECTED
QUICK LEARN WAS PERFORMED
(A919) FUSED B+ CIRCUIT TO PCM OPEN
(Z908 and Z977) GROUND CIRCUIT OPEN

Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)



Diagnostic Test

1. BATTERY WAS DISCONNECTED


Has the battery been disconnected, lost its charge, or been replaced recently?

Yes


No

2. CHECK IF THE QUICK LEARN WAS PERFORMED


Has a Quick Learn procedure been performed?

Yes


No

3. PCM REPLACED OR DISCONNECTED


Has the PCM been replaced or disconnected?

Yes


No

4. (A919) FUSED B(+) CIRCUIT



Turn the ignition off to the lock position.
Disconnect the PCM C1 harness connector.

NOTE: Check connectors - Clean/repair as necessary.


CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Using a 12-volt test light connected to ground, check the (A919) Fused B(+) circuit.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.



Does the test light illuminate brightly?

Yes


No

5. (Z908) AND (Z977) GROUND CIRCUITS



Turn the ignition off to the lock position.
Disconnect the PCM C4 harness connector.

NOTE: Check connectors - Clean/repair as necessary.


Using a 12-volt test light connected to 12-volts, check the (Z908) and (Z977) Ground circuits in the appropriate terminal of Miller tool #8815.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.



Does the test light illuminate brightly for all of the ground circuits?

Yes


No

6. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set the DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorted and open circuits.
With the scan tool, check the DTC EVENT DATA to help identify the conditions in which the DTC was set.

Were there any problems found?

Yes


No