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Home >> Honda >> 2021 >> Insight LX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC Diagnostics (2 Of 4) >> DTC Troubleshooting >> DTC P0340
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DTC P0340

DTC P0340  : CMP Sensor A No Signal

NOTE: Before you troubleshoot, review the general troubleshooting information .
DTC Description Confirmed DTC Pending DTC
P0340 CMP Sensor A No Signal    

DTC (PGM-FI)

  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. Enter the maintenance mode, then start the engine .

    -5. Check for Pending or Confirmed DTCs with the HDS.

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

    DTC (PGM-FI)

    Is DTC P0340 indicated?

    YES 

    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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

  2. Determine possible failure area (VCC2 line, others)

    -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 (female terminals) No. 1:
    Test point 2 Body ground
    GHH384995Courtesy of HONDA, U.S.A., INC.

    Is there about 5.0 V?

    YES 

    Go to step 4.

    NO 

    Go to step 3.

  3. Open wire check (VCC2 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 E (80P)

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

    Test condition Vehicle OFF (LOCK) mode
      CMP sensor A 3P connector: disconnected
      PCM connector E (80P): disconnected
    Test point 1 CMP sensor A 3P connector (female terminals) No. 1:
    Test point 2 PCM connector E (80P) No. 77
    GHH384997Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The VCC2 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P0340 goes away and the PCM was substituted, replace the original PCM .

    NO 

    Repair an open in the VCC2 wire between the PCM (E77) and CMP sensor A.

  4. Determine possible failure area (CAM line, others)

    -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 (female terminals) No. 3:
    Test point 2 Body ground
    GHH384999Courtesy of HONDA, U.S.A., INC.

    Is there about 5.0 V?

    YES 

    Go to step 5.

    NO 

    Go to step 7.

  5. Determine possible failure area (CMP sensor A, others)

    -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 (female terminals) No. 1:
    Test point 2 CMP sensor A 3P connector (female terminals) No. 2:
    GHH385002Courtesy of HONDA, U.S.A., INC.

    Is there about 5.0 V?

    YES 

    The SG2 wire is OK. Replace CMP sensor A .

    NO 

    Go to step 6.

  6. Open wire check (SG2 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 E (80P)

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

    Test condition Vehicle OFF (LOCK) mode
      CMP sensor A 3P connector: disconnected
      PCM connector E (80P): disconnected
    Test point 1 CMP sensor A 3P connector (female terminals) No. 2:
    Test point 2 PCM connector E (80P) No. 78
    GHH385004Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The SG2 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P0340 goes away and the PCM was substituted, replace the original PCM .

    NO 

    Repair an open in the SG2 wire between the PCM (E78) and CMP sensor A.

  7. 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 E (80P)

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

    Test condition Vehicle OFF (LOCK) mode
      CMP sensor A 3P connector: disconnected
      PCM connector E (80P): disconnected
    Test point 1 PCM connector E (80P) No. 41
    Test point 2 Body ground

    Is there continuity?

    YES 

    Repair a short in the CAM wire between the PCM (E41) and CMP sensor A.

    NO 

    The CAM wire is not shorted. Go to step 8.

  8. 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 E (80P): disconnected
    Test point 1 CMP sensor A 3P connector (female terminals) No. 3:
    Test point 2 PCM connector E (80P) No. 41
    GHH385006Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The CAM wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. 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 (E41) and CMP sensor A.

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