DTC Troubleshooting: P0847 (26-3) (R18A: A/T)

DTC Troubleshooting: P0847 (26-3)

DTC P0847:  Short in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck ON


NOTE:

1.Clear the DTC with the HDS.

2.Check the 3rd PRES SWITCH signal with the HDS in the A/T data list when not in 3rd gear.

Is the 3rd PRES SWITCH OFF?


YES - Go to 3.


NO - Go to 6.


3.Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).

4.7-position transmission: Drive the vehicle in 3rd gear in the D3 position for more than 5 seconds, then shift to the D position, and drive in 4th gear for more than 5 seconds. Slow down and stop the wheels.
5-position transmission: Drive the vehicle in 3rd gear in the S position for more than 5 seconds, then upshift to 4th gear, and drive in 4th gear for more than 5 seconds. Slow down and stop the wheels.

5.Monitor the OBD status for P0847 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the result indicate FAILED?


YES - Go to 6.


NO - Intermittent failure, the system is OK at this time. Check the OP3SW (BLK/RED) wire for an intermittent short to ground between the 3rd clutch transmission fluid pressure switch and the PCM. If the tester indicates NOT COMPLETED, return to 4 and recheck.n

6.Turn the ignition switch OFF.

7.Disconnect the 3rd clutch transmission fluid pressure switch connector.

8.Turn the ignition switch ON (II).

9.Check the 3rd PRES SWITCH signal with the HDS in the A/T data list.

Is the 3rd PRES SWITCH OFF?


YES - Replace the 3rd clutch transmission fluid pressure switch, then go to 14.


NO - Go to 10.


10.Turn the ignition switch OFF.

11.Jump the SCS line with the HDS.

12.Disconnect PCM connector B (44P).

13.Check for continuity between PCM connector terminal B9 and body ground.

 

Is there continuity?


YES - Repair short to ground in the wire between PCM connector terminal B9 and the 3rd clutch transmission fluid pressure switch, then go to 14.


NO - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original  PCM.n

14.Clear the DTC with the HDS.

15.Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).

16.7-position transmission: Drive the vehicle in 3rd gear in the D3 position for more than 5 seconds, then shift to the D position, and drive in 4th gear for more than 5 seconds. Slow down and stop the wheels.
5-position transmission: Drive the vehicle in 3rd gear in the S position for more than 5 seconds, then upshift to 4th gear, and drive in 4th gear for more than 5 seconds. Slow down and stop the wheels.

17.Monitor the OBD status for P0847 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the result indicate PASSED?


YES - Troubleshooting is complete.n


NO - Return to 6 and recheck.