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 SystemsHow to Troubleshoot the CVT System(CVT System) .

• 1. Problem verification:

  1. Turn the vehicle to the ON mode.

  2. Clear the DTC with the HDS.

  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 CMP sensor A 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 (IG1 ACG/IG1(MAIN)/IG1(CAM) line):

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

  2. Disconnect the following connector.

  CMP sensor A 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 A 3P connector: disconnected
  Test point 1	CMP sensor A 3P connector No. 1
  Test point 2	Body ground

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

  Is there battery voltage?

  YES 

  The IG1 ACG/IG1(MAIN)/IG1(CAM) wire is OK. Go to step 3.

  NO 

  Repair an open in the IG1 ACG/IG1(MAIN)/IG1(CAM) wire between No. B2 (10 A) fuse in the under-dash fuse/relay box and CMP sensor A.

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

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

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

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

  Is there battery voltage?

  YES 

  The LG wire is OK. Replace CMP sensor A .

  NO 

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

• 5. Shorted wire check (CAM line):

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

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

  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 A 3P connector: disconnected
  	PCM connector B (51P): disconnected
  Test point 1	PCM connector B (51P) No. 39

  Test point 2

  Body ground

  Is there continuity?

  YES 

  Repair a short in the CAM wire between the PCM (B39) and CMP sensor A.

  NO 

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

• 6. Open wire check (CAM line):

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

  Test condition	Vehicle OFF (LOCK) mode
  	CMP sensor A 3P connector: disconnected
  	PCM connector B (51P): disconnected
  Test point 1	CMP sensor A 3P connector No. 3
  Test point 2	PCM connector B (51P) No. 39

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

  Is there continuity?

  YES 

  The CAM 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 CAM wire between the PCM (B39) and CMP sensor A.