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DTC P2101

DTC P2101  : ETCS Malfunction

GHH136666Courtesy of HONDA, U.S.A., INC.
Do not insert your fingers into the installed throttle body when you turn the vehicle to the ON mode, or while the vehicle is in ON mode. If you do, you will seriously injure your fingers if the throttle valve is activated.
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information .
DTC Description Confirmed DTC Pending DTC Freeze Frame
P2101 ETCS Malfunction      

DTC (PGM-FI)

  1. ETCS system check

    -1. Turn the vehicle to the ON mode.

    -2. Clear the DTC with the HDS.

    -3. Select the ETCS TEST in the INSPECTION MENU with the HDS.

    ETCS TEST

    Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC Freeze Frame
    P2101 ETCS Malfunction      

    Is DTC P2101 indicated?

    YES 

    The failure is duplicated. Go to step 3.

    NO 

    The failure is not duplicated. Go to step 2.

  2. Problem verification

    -1. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:

    • ENGINE SPEED
    • VEHICLE SPEED
    • APP SENSOR
    Signal Current conditions
    Values Unit
    ENGINE SPEED    
    VEHICLE SPEED    
    APP SENSOR    

    -2. Check for Pending or Confirmed DTCs with the HDS.

    DTC (PGM-FI)

    Is DTC P2101 indicated?

    YES 

    The failure is duplicated. Go to step 3.

    NO 

    Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.

  3. Determine possible failure area (throttle body, others)

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

    -2. Disconnect the intake air duct from the throttle body .

    -3. Turn the vehicle to the ON mode.

    -4. Clear the DTC with the HDS.

    -5. Visually check the throttle valve operation while doing the ETCS TEST in the INSPECTION MENU with the HDS.

    ETCS TEST

    Does the throttle valve operate smoothly?

    YES 

    Clean the throttle body , then do the repair verification. If DTC P2101 is indicated, replace the throttle body , then do the repair verification.

    NO 

    Go to step 4.

  4. Open wire check (SG5 line)

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

    -2. Jump the SCS line with the HDS.

    -3. Disconnect the following connectors.

    PCM connector B (51P)
    Throttle body 6P connector

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

    Test condition Vehicle OFF (LOCK) mode
      Throttle body 6P connector: disconnected
      PCM connector B (51P): disconnected
    Test circuit SG5
    Test point 1 Throttle body 6P connector No. 3 (GRN)
    Test point 2 PCM connector B (51P) No. 46 (GRN)
    GHH345183Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The SG5 wire is OK. Go to step 5.

    NO 

    Repair an open in the SG5 wire between the throttle body and the PCM (B46), then do the repair verification.

  5. Open wire check (MTR1 line, MTR2 line)

    -1. Disconnect the following connector.

    PCM connector C (51P)

    -2. Connect terminals A and B with a jumper wire.

    Terminal A Throttle body 6P connector No. 1 (LT BLU)
    Terminal B Throttle body 6P connector No. 2 (WHT)
    GHH345184Courtesy of HONDA, U.S.A., INC.

    -3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      PCM connector B (51P): disconnected
      PCM connector C (51P): disconnected
      Throttle body 6P connector: disconnected
      Throttle body 6P connector No. 1 and No. 2: jumped
    Test circuit MTR1, MTR2
    Test point 1 PCM connector C (51P) No. 2 (LT BLU)
    Test point 2 PCM connector C (51P) No. 3 (WHT)
    GHH345185Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The MTR1 and MTR2 wires are OK. Go to step 6.

    NO 

    Repair an open in the MTR1 wire or the MTR2 wire between the PCM (C2, C3) and the throttle body, then do the repair verification.

  6. Throttle body internal circuit check

    -1. At the throttle body side, measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      PCM connector B (51P): disconnected
      PCM connector C (51P): disconnected
      Throttle body 6P connector: disconnected
    Test circuit MTR1, MTR2
    Test point 1 Throttle body 6P connector No. 1 (throttle body side)
    Test point 2 Throttle body 6P connector No. 2 (throttle body side)
    GHH345186Courtesy of HONDA, U.S.A., INC.

    Is there about 1.0 kΩ or more?

    YES 

    Replace the throttle body , then do the repair verification.

    NO 

    The throttle body internal circuit is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then do the repair verification.

  7. Repair verification

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

    -2. Reconnect all connectors.

    -3. Exit the SCS mode with the HDS.

    -4. Turn the vehicle to the ON mode.

    -5. Reset the PCM with the HDS .

    Reset PCM

    -6. Do the PCM idle learn procedure .

    -7. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:

    • ENGINE SPEED
    • VEHICLE SPEED
    • APP SENSOR
    Signal Current conditions
    Values Unit
    ENGINE SPEED    
    VEHICLE SPEED    
    APP SENSOR    

    -8. Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC Freeze Frame
    P2101 ETCS Malfunction      

    DTC (PGM-FI)

    Is DTC P2101 indicated?

    YES 

    Check for poor connections or loose terminals at the throttle body and the PCM, and clean the throttle body , then go to step 1. If the PCM was updated, substitute a known-good PCM , then recheck. If the PCM was substituted, go to step 1.

    NO 

    Troubleshooting is complete. If the PCM was substituted, replace the original PCM . If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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