P1684

P1684-BATTERY WAS DISCONNECTED







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.

- When Monitored:
After a reset (ignition turned to the RUN position).

- Set Condition:
The checksum of the battery backed RAM does not match the stored checksum. Set Time: Less than 7 msec.





Always perform the 40/41TE Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

1. BATTERY WAS DISCONNECTED

Has the battery been disconnected, lost it's charge, or been replaced recently?

Yes

- Disconnecting or replacing the battery will set this DTC. Erase the DTC.
- Perform 40/41TE TRANSMISSION VERIFICATION TEST 40/41TE Transmission Verification Test

No

- Go To 2

2. WAS QUICK LEARN PERFORMED

Has a Quick Learn procedure been performed?

Yes

- Performing a Quick Learn procedure will set this DTC. Erase the DTC Quick Learn Procedure.
- Perform 40/41TE TRANSMISSION VERIFICATION TEST 40/41TE Transmission Verification Test

No

- Go To 3

3. PCM REPLACED OR DISCONNECTED

Has the PCM been replaced or disconnected?

Yes

- Replacing or disconnecting the PCM will set this DTC. Erase the DTC.
- Perform 40/41TE TRANSMISSION VERIFICATION TEST 40/41TE Transmission Verification Test

No

- Go To 4

4. CHECK THE (A931) FUSED B(+) CIRCUIT FOR AN OPEN




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

NOTE: Check connectors - Clean/repair as necessary.

3. Using a 12-volt test light connected to ground, check the (A931) Fused B(+) circuit in the PCM C1 harness connector.

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

- Go To 5

No

- Repair the (A931) Fused B(+) circuit for an open. If the fuse is open make sure to check for a short to ground.
- Perform 40/41TE TRANSMISSION VERIFICATION TEST 40/41TE Transmission Verification Test

5. CHECK THE (Z902) GROUND CIRCUITS FOR AN OPEN




1. Turn the ignition off to the lock position.
2. Disconnect the PCM C2 harness connector.
3. Using a 12-volt test light connected to 12-volts, check both (Z902) Ground circuits in PCM C1 harness connector

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 both ground circuits?

Yes

- Go To 6

No

- Repair the (Z902) Ground circuit(s) for an open.
- Perform 40/41TE TRANSMISSION VERIFICATION TEST 40/41TE Transmission Verification Test

6. INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
4. 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

- Repair as necessary.
- Perform 40/41TE TRANSMISSION VERIFICATION TEST 40/41TE Transmission Verification Test

No

- Test Complete.