DTC P0990

DTC P0990  : Transmission Fluid Pressure Switch E (6th Clutch) Circuit High

NOTE: Before you troubleshoot, review the General Troubleshooting Information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016), or How to Troubleshoot the A/T System (2014 2015) .
• If DTC P0990 is stored in the PCM, the transmission does not shift to any gear other than 3rd or 6th gear because of the fail-safe function.

DTC (A/T)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Raise the vehicle on a lift. Make sure it is securely supported, and allow all four wheels to rotate freely.

   - 4. Start the engine, disable the VSA by pressing the VSA OFF button.

   - 5. Run the vehicle in 6th gear, and check the parameter(s) below with the HDS. Slow down, and stop the wheels.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   6th Pressure Switch	ON

   Do the current condition(s) match the threshold in 6th gear?

   YES 

   Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between transmission fluid pressure switch E (6th clutch) and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

   NO 

   The failure is duplicated. Go to step 2.

2. Determine possible failure area (transmission fluid pressure switch E (6th clutch), others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Transmission fluid pressure switch E (6th clutch) 1P connector

   - 3. Connect terminals A and B with a jumper wire.

   Terminal A	Transmission fluid pressure switch E (6th clutch) 1P connector No. 1 (GRY)
   Terminal B	Body ground

   Courtesy of HONDA, U.S.A., INC.

   - 4. Turn the vehicle to the ON mode.

   - 5. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   6th Pressure Switch	ON

   Do the current condition(s) match the threshold?

   YES 

   Replace transmission fluid pressure switch E (6th clutch) .

   NO 

   Go to step 3.

3. Open wire check (OP6SW line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Remove the jumper wire.

   - 3. Jump the SCS line with the HDS.

   - 4. Disconnect the following connector.

   PCM connector B (51P) - Refer to: How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016)

   - 5. Check for continuity between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode

   	Transmission fluid pressure switch E (6th clutch) 1P connector: disconnected
   	PCM connector B (51P): disconnected
   Test circuit	OP6SW
   Test point 1	Transmission fluid pressure switch E (6th clutch) 1P connector No. 1 (GRY)
   Test point 2	PCM connector B (51P) No. 28 (GRY)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The OP6SW wire is OK. Replace the PCM - Refer to: PCM Removal and Installation (2016), or PCM Removal and Installation (2014 2015) .

   NO 

   Repair an open in the OP6SW wire between transmission fluid pressure switch E (6th clutch) and the PCM.