DTC Troubleshooting: P1900(CVT (TCM)) (2020 2021)

DTC P1900  : EOP-RELAY High Input

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC(CVT)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode, and wait for at least 5 seconds.

   -5. Select the Electrical Oil Pump Activation in the Function Test Menu, and drive the auxiliary transmission fluid pump for at least 5 seconds with the HDS.

   -6. Monitor the OBD STATUS for P1900 in the DTCs MENU with the HDS.

   DTC Description	OBD Status
   P1900 EOP-RELAY High Input

   Does the HDS indicate FAILED?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between the auxiliary transmission fluid pump relay, the auxiliary transmission fluid pump, and the TCM. If the HDS indicates NOT COMPLETED, go to step 1-3 and recheck.

2. Relay check

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

   -2. Remove the auxiliary transmission fluid pump relay .

   -3. Test the auxiliary transmission fluid pump relay .

   Is the relay OK?

   YES 

   The auxiliary transmission fluid pump relay is OK. Go to step 3.

   NO 

   Replace the auxiliary transmission fluid pump relay.

3. Shorted wire check (EOPRLY line)

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

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   NOTE:  This step must be done to protect the TCM from damage.

   -3. Disconnect the following connector.

   TCM 50P connector

   -4. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Auxiliary transmission fluid pump relay 4P socket: disconnected
   	TCM 50P connector: disconnected
   Test point 1	TCM 50P connector No. 27
   Test point 2	Body ground

   Is there 1 MΩ or more?

   YES 

   The EOPRLY wire is OK. Go to step 4.

   NO 

   Repair a short to ground in the EOPRLY wire between the auxiliary transmission fluid pump relay and the TCM.

4. Shorted wire check (EOPVB line to power)

   -1. Disconnect the following connector.

   Auxiliary transmission fluid pump 4P connector

   -2. Turn the vehicle to the ON mode.

   -3. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Auxiliary transmission fluid pump relay 4P socket: disconnected
   	Auxiliary transmission fluid pump 4P connector: disconnected
   	TCM 50P connector: disconnected

   Test point 1	Auxiliary transmission fluid pump 4P connector (female terminals) No. 4:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Repair a short to power in the EOPVB wire between the auxiliary transmission fluid pump relay and the auxiliary transmission fluid pump.

   NO 

   The EOPVB wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the original TCM .