DTC P2176

DTC P2176  : Throttle Actuator Control System Idle Position Not Learned

Courtesy 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, review the general troubleshooting information - Refer to: How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016), or How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Fuel and Emissions Systems .
• If DTC P2135 is stored at the same time as DTC P2176, troubleshoot DTC P2135 first, then recheck for DTC P2176.

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. Turn the vehicle to the ON mode, and wait for 10 seconds.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P2176 Throttle Actuator Control System Idle Position Not Learned

   Is DTC P2176 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 throttle body and the PCM, then clean the throttle body . 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. Throttle body operation check

   -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 move to its fully closed position?

   YES 

   Go to step 3.

   NO 

   Go to step 4.

3. Throttle body condition check

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

   - 2. Remove the throttle body.

   - 3. Check for sludge or carbon on the throttle valve.

   Is there sludge or carbon on the throttle valve?

   YES 

   Clean the throttle body .

   NO 

   Replace the throttle body .

4. Open wire check (MTR1 line, MTR2 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 C (51P) - Refer to: How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016), or How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015)

   Throttle body 6P connector

   - 4. 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)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	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)

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

   Is there continuity?

   1. YES 

      The MTR1 wire and the MTR2 wire are OK. Substitute a known-good throttle body , then recheck:?

      • If DTC P2176 is not indicated, replace the original throttle body .
      • If DTC P2176 is indicated again, replace the PCM - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016) .

      NO 

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