DTC Troubleshooting: P0848 (26)
DTC Troubleshooting: P0848 (26)
DTC P0848:
Open in Transmission Fluid Pressure Switch B (3rd Clutch) Circuit, or Transmission Fluid Pressure Switch B (3rd Clutch) Stuck OFF
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information Reading and Clearing Diagnostic Trouble Codes.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
4. Test-drive the vehicle in the 3rd gear with the shift lever in D and the D3 driving mode on (press the D3 button). Check that the Shift Control indicates 3 in the Data List with the HDS.
5. Check the 3rd Pressure Switch in the Data List with the HDS.
Is the 3rd Pressure Switch ON?
YES -
Go to step 6.
NO -
Go to step 8.
6. Test-drive the vehicle in 3rd gear with the shift lever in D for at least 2 seconds.
7. Monitor the OBD STATUS for P0848 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES -
Go to step 8.
NO -
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between transmission fluid pressure switch B (3rd clutch) and the PCM. If the HDS indicates NOT COMPLETED, go to step 5.
8. Turn the ignition switch to LOCK (0).
9. Disconnect the transmission fluid pressure switch B (3rd clutch) connector.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between the transmission fluid pressure switch B (3rd clutch) connector terminal and body ground.
Is there about 5 V?
YES -
Replace transmission fluid pressure switch B (3rd clutch) Transmission Fluid Pressure Switch A (2ND Clutch) Replacement, then go to step 13.
NO -
Go to step 12.
12. Measure the voltage between PCM connector terminal C10 and body ground.
Is there about 5 V?
YES -
Repair an open in the wire between PCM connector terminal C10 and transmission fluid pressure switch B (3rd clutch), then go to step 13.
NO -
Go to step 20.
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Clear the DTC with the HDS.
16. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
17. Test-drive the vehicle in 3rd gear with the shift lever in D and the D3 driving mode (press the D3 button) for at least 2 seconds. Then press the D3 button once more, and drive in 4th gear for at least 2 seconds.
18. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0848 indicated?
YES -
Check for poor connections or loose terminals between transmission fluid pressure switch B (3rd clutch) and the PCM, then go to step 1.
NO -
Go to step 19.
19. Monitor the OBD STATUS for P0848 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 18, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between transmission fluid pressure switch B (3rd clutch) and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 16.
20. Reconnect all connectors.
21. Update the PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good PCM.
22. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
23. Test-drive the vehicle in 3rd gear with the shift lever in D and the D3 driving mode (press the D3 button) for at least 2 seconds. Then press the D3 button once more, and drive in 4th gear for at least 2 seconds.
24. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0848 indicated?
YES -
Check for poor connections or loose terminals between transmission fluid pressure switch B (3rd clutch) and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 22. If the PCM was substituted, go to step 1.
NO -
Go to step 25.
25. Monitor the OBD STATUS for P0848 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM ECM/PCM Replacement (A/T). If any other Pending or Confirmed DTCs were indicated in step 24, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between transmission fluid pressure switch B (3rd clutch) and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 22. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 22.