DTC P0977 (CVT (ECM/Pcm))

DTC P0977  : Shift Solenoid Valve B Circuit High

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. Start the engine in P, and wait for at least 10 seconds.

   -4. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0977 Shift Solenoid Valve B Circuit High

   Is DTC P0977 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the shift solenoid valve B 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.

2. Shift solenoid valve B check

   -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 PCM from damage.

   -3. Disconnect the following connector.

   PCM connector C (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector C (51P): disconnected
   Test point 1	PCM connector C (51P) No. 19
   Test point 2	Body ground

   Is there 10.6-13.5 Ω?

   YES 

   The shift solenoid valve B is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the original PCM .

   NO 

   Go to step 3.

3. Open wire check (SOL B line)

   -1. Disconnect the following connector.

   Solenoid wire harness A 8P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	Solenoid wire harness A 8P connector: disconnected
   	PCM connector C (51P): disconnected
   Test point 1	Solenoid wire harness A 8P connector (female terminals) No. 5 :
   Test point 2	PCM connector C (51P) No. 19

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

   Is there continuity?

   YES 

   Go to step 4.

   NO 

   Repair an open in the SOL B wire between the solenoid wire harness A 8P connector and the PCM.

4. Shift solenoid valve B internal resistance check

   -1. Disconnect the following connector.

   Shift solenoid valve B 2P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	Solenoid wire harness A 8P connector: disconnected
   	Shift solenoid valve B 2P connector: disconnected
   Test point 1	Shift solenoid valve B 2P connector (male terminals) No. 1 :
   Test point 2	Body ground

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

   Is there 10.6-13.5 Ω?

   YES 

   Shift solenoid valve B is OK. Repair an open in the SHB+ wire between the solenoid wire harness A 8P connector and shift solenoid valve B.

   NO 

   Faulty shift solenoid valve B. Replace the valve body assembly .