DTC P2243, P2247

DTC P2243 : Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage DTC P2247 : Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit High Voltage

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 .

Information marked with an asterisk (*) applies to the front bank (Bank 2).

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P2243 Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage
P2247 Front A/F Sensor (Bank 2, Sensor 1) VCENT 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. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.

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

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P2243 Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage
P2247 Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit High Voltage

Is DTC P2243 and/or P2247 * 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 the A/F sensor (Sensor 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.

Open wire check (VCENTB1 (VCENTB2) * 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 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)

A/F sensor (Sensor 1) 6P connector

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

Test condition	Vehicle OFF (LOCK) mode
	PCM connector C (51P): disconnected
	A/F sensor (Sensor 1) 6P connector: disconnected
Test circuit	VCENTB1 (VCENTB2) *
Test point 1	Rear A/F sensor (Bank 1, Sensor 1) 6P connector No. 4 (RED)
	Front A/F sensor (Bank 2, Sensor 1) 6P connector No. 4 (YEL) *
Test point 2	PCM connector C (51P) No. 26 (RED)
	PCM connector C (51P) No. 29 (YEL) *

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

Is there continuity?

YES

The VCENTB1 (VCENTB2) * wire is OK. Go to step 3.

Repair an open in the VCENTB1 (VCENTB2) * wire between the PCM (C26 (C29) *) and the A/F sensor (Sensor 1).

PCM internal circuit check

-1. Reconnect the following connector.

- 2. Exit the SCS mode with the HDS.

- 3. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.

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

Test condition	Engine running
	A/F sensor (Sensor 1) 6P connector: disconnected
Test circuit	VCENTB1 (VCENTB2) *
Test point 1	Rear A/F sensor (Bank 1, Sensor 1) 6P connector No. 4 (RED)
	Front A/F sensor (Bank 2, Sensor 1) 6P connector No. 4 (YEL) *
Test point 2	Body ground

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

Is there about 0.2 V or less?

YES

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) .

The PCM internal circuit is OK. Replace the A/F sensor (Sensor 1) .