DTC P16F5 (2016 2017 2018 2019 2020 With Auto Idle Stop System)

DTC P16F5 : Starter Cut Relay 1 Control Circuit High Voltage

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) .

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P16F5 Starter Cut Relay 1 Control Circuit High Voltage

DTC (PGM-FI)

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
P16F5 Starter Cut Relay 1 Control Circuit High Voltage

Is DTC P16F5 indicated?

YES

The failure is duplicated. Go to step 2.

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1 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.

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

- 2. Remove starter cut relay 1 (A) from the auxiliary under-hood relay block.

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

- 3. Test starter cut relay 1.

Is the relay OK?

YES

Go to step 3.

NO

Replace starter cut relay 1.

Shorted wire check (STRLY line to power)

-1. Jump the SCS line with the HDS.

SCS short

- 2. Disconnect the following connector.

PCM connector A (51P)

- 3. Turn the vehicle to the ON mode.

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

Test condition	Vehicle ON mode
	Starter cut relay 1: disconnected
	PCM connector A (51P): disconnected
Test point 1	PCM connector A (51P) No. 3 - Refer to: PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016), or PCM Connector for Inputs and Outputs (2017 2018 2019 2020)
Test point 2	Body ground

Is there 0.1 V or less?

YES

The STRLY 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 (2016), or PCM Removal and Installation (2014 2015) .

Repair a short to power in the STRLY wire between the PCM (A3) and starter cut relay 1.