DTC P16E2 (2014 2015 2016 Without Auto Idle Stop System)

DTC P16E2  : PGM-FI-ACG LIN Communication Error

NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015), or 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) .
• Check for a loose terminal on the alternator (+B terminal). If the alternator +B terminal was loose, DTC P16E2 will be stored.

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.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P16E2 PGM-FI-ACG LIN Communication Error

   Is DTC P16E2 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 alternator 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. Determine possible failure area (alternator, others)

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

   - 2. Disconnect the following connector.

   Alternator 1P connector

   - 3. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	Alternator 1P connector: disconnected
   Test circuit	LIN
   Test point 1	Alternator 1P connector No. 1 (YEL)
   Test point 2	Body ground

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

   Is there 0 V?

   YES 

   Go to step 3.

   NO 

   Replace the alternator .

3. Shorted wire check (LIN line)

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

   - 2. Jump the SCS line with the HDS.

   - 3. Disconnect the following connector.

   PCM connector B (51P) - Refer to: How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Fuel and Emissions Systems, or 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)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Alternator 1P connector: disconnected
   	PCM connector B (51P): disconnected
   Test circuit	LIN
   Test point 1	Alternator 1P connector No. 1 (YEL)

   Test point 2

   Body ground

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

   Is there continuity?

   YES 

   Repair a short in the LIN wire between the alternator and the PCM (B50).

   NO 

   The LIN wire is not shorted. Go to step 4.

4. Open wire check (LIN line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Alternator 1P connector: disconnected
   	PCM connector B (51P): disconnected
   Test circuit	LIN
   Test point 1	Alternator 1P connector No. 1 (YEL)
   Test point 2	PCM connector B (51P) No. 50 (YEL)

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

   Is there continuity?

   YES 

   The LIN wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016) .

   NO 

   Repair an open in the LIN wire between the alternator and the PCM (B50).