DTC P1658

DTC P1658  : ETCS Control Relay ON Malfunction

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

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

   ETCS TEST

   Is the RELAY circuit OK?

   YES 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ETCS control relay 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.

   NO 

   The failure is duplicated. Go to step 2.

2. ETCS control relay test

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

   - 2. Remove the ETCS control relay (A) from the under-hood fuse/relay box.

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

   - 3. Test the ETCS control relay.

   Is the relay OK?

   YES 

   Go to step 3.

   NO 

   Replace the ETCS control relay.

3. Shorted wire check (DBW RLY 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 A (51P) - Refer to: 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), or How to Troubleshoot the Fuel and Emissions Systems

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

   Test condition	Vehicle OFF (LOCK) mode
   	ETCS control relay: disconnected
   	PCM connector A (51P): disconnected
   Test circuit	DBW RLY
   Test point 1	PCM connector A (51P) No. 13 (WHT)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the DBW RLY wire between the PCM (A13) and the ETCS control relay.

   NO 

   The DBW RLY wire is OK. Go to step 4.

4. Shorted wire check (IG1M/IG1(DBW) line to power)

   -1. Disconnect the following connector.

   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)

   - 2. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	ETCS control relay: disconnected
   	PCM connector A (51P): disconnected
   	PCM connector C (51P): disconnected
   Test circuit	IG1M/IG1(DBW)
   Test point 1	PCM connector C (51P) No. 4 (GRN)
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Repair a short to power in the IG1M/IG1(DBW) wire between the PCM (C4) and the ETCS control relay.

   NO 

   The IG1M/IG1(DBW) 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) .