DTC P0971 (CVT (ECM/Pcm))

DTC P0971  : Pressure Control Solenoid C Control 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, and wait for at least 1 second.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0971 Pressure Control Solenoid C Control Circuit High

   Is DTC P0971 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 CVT clutch pressure control solenoid valve 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. CVT clutch pressure control solenoid valve 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. 5
   Test point 2	Body ground

   Is there 4.7-5.9 Ω?

   YES 

   The CVT clutch pressure control solenoid valve 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. Shorted wire check (CPC LS line to power)

   -1. Disconnect the following connector.

   Solenoid wire harness A 8P connector

   -2. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	Solenoid wire harness A 8P connector : disconnected
   	PCM connector C (51P): disconnected
   Test point 1	PCM connector C (51P) No. 5
   Test point 2	Body ground

   Is there voltage?

   YES 

   Repair a short to power in the CPC LS wire between the solenoid wire harness A 8P connector and the PCM.

   NO 

   The CPC LS wire is not shorted to power. Go to step 4.

4. Open wire check (CPC LS line)

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

   -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. 1 :
   Test point 2	PCM connector C (51P) No. 5

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

   Is there continuity?

   YES 

   Go to step 5.

   NO 

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

5. Open wire check (GND1 line, GND2 line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector B (51P): disconnected
   Test Circuit 1
   Test point 1	PCM connector B (51P) No. 11
   Test point 2	Body ground
   Test Circuit 2
   Test point 1	PCM connector B (51P) No. 12
   Test point 2	Body ground

   Are there continuity?

   YES 

   Go to step 6.

   NO 

   Repair an open in GND1 wire and/or GND2 wire between the PCM and body ground (G101), or repair poor body ground (G101).

6. CVT clutch pressure control solenoid valve internal resistance check

   -1. Remove the valve body assembly .

   -2. Disconnect the following connector.

   CVT clutch pressure control solenoid valve 2P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	Lower valve body: removed
   	Solenoid wire harness B 6P connector: disconnected
   	CVT clutch pressure control solenoid valve 2P connector: disconnected
   Test point 1	CVT clutch pressure control solenoid valve 2P connector (female terminals) No. 1 :
   Test point 2	CVT clutch pressure control solenoid valve 2P connector (female terminals) No. 2 :

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

   Is there 4.7-5.9 Ω?

   YES 

   Go to step 7.

   NO 

   Faulty CVT clutch pressure control solenoid valve. Replace the valve body assembly .

7. Open wire check (CPC- line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Lower valve body: removed
   	Solenoid wire harness B 6P connector: disconnected
   	CVT clutch pressure control solenoid valve 2P connector: disconnected
   Test point 1	CVT clutch pressure control solenoid valve 2P connector (female terminals) No. 1 :
   Test point 2	Body ground (valve body assembly)

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

   Is there continuity?

   YES 

   Go to step 8.

   NO 

   Repair an open in the CPC- wire between the CVT clutch pressure control solenoid valve and body ground (G162), or repair poor body ground (G162).

8. Determine opened wire in either solenoid wire harness A or B (CPC+ line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Lower valve body: removed
   	Solenoid wire harness B 6P connector: disconnected
   	CVT clutch pressure control solenoid valve 2P connector: disconnected
   Test point 1	Solenoid wire harness B 6P connector (male terminals) No. 5 :
   Test point 2	CVT clutch pressure control solenoid valve 2P connector (female terminals) No. 2 :

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

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

   Is there continuity?

   YES 

   Repair an open in the CPC+ wire between the solenoid wire harness A 6P connector and the solenoid wire harness A 8P connector.

   NO 

   Repair an open in the CPC+ wire between the CVT clutch pressure control solenoid valve and the solenoid wire harness B 6P connector.