DTC P0340: CMP Sensor A No Signal

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS or How to Troubleshoot the CVT System (CVT) .

DTC (PGM-FI)

1. Problem verification:

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS - Refer to: HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS or How to Troubleshoot the CVT System (CVT) .

   - 3. Start the engine.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0340 CMP Sensor A No Signal

   Is DTC P0340 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 at the CMP sensor 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. Open wire check (FI MAIN RLY OUT/IGP (TDCAM) line):

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

   - 2. Disconnect the following connector.

   CMP sensor 3P connector

   - 3. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	CMP sensor 3P connector: disconnected
   Test point 1	CMP sensor 3P connector No. 1
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The FI MAIN RLY OUT/IGP (TDCAM) wire is OK. Go to step 3.

   NO 

   Repair an open in the FI MAIN RLY OUT/IGP (TDCAM) wire between PGM-FI main relay 1 and the CMP sensor.

3. Determine possible failure area (TDCAM line, LG line):

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

   Test condition	Vehicle ON mode
   	CMP sensor 3P connector: disconnected
   Test point 1	CMP sensor 3P connector No. 3
   Test point 2	Body ground

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

   Is there about 5.0 V?

   YES 

   Go to step 4.

   NO 

   Go to step 5.

4. Open wire check (LG line):

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

   Test condition	Vehicle ON mode
   	CMP sensor 3P connector: disconnected
   Test point 1	CMP sensor 3P connector No. 1
   Test point 2	CMP sensor 3P connector No. 2

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

   Is there battery voltage?

   YES 

   The LG wire is OK. Replace the CMP sensor .

   NO 

   Repair an open in the LG wire between the CMP sensor and G101.

5. Shorted wire check (TDCAM line):

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

   - 2. Jump the SCS line with the HDS.

   SCS Short

   - 3. Disconnect the following connector.

   PCM connector B (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CMP sensor 3P connector: disconnected
   	PCM connector B (51P): disconnected
   Test point 1	PCM connector B (51P) No. 30
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the TDCAM wire between the PCM (B30) and the CMP sensor.

   NO 

   The TDCAM wire is not shorted. Go to step 6.

6. Open wire check (TDCAM line):

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

   Test condition	Vehicle OFF (LOCK) mode
   	CMP sensor 3P connector: disconnected
   	PCM connector B (51P): disconnected
   Test point 1	PCM connector B (51P) No. 30
   Test point 2	CMP sensor 3P connector No. 3

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

   Is there continuity?

   YES 

   The TDCAM wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0340 goes away and the PCM was updated, troubleshooting is complete. If DTC P0340 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the TDCAM wire between the PCM (B30) and the CMP sensor.