DTC P1658: ETCS Control Relay ON Malfunction

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS or How to Troubleshoot the CVT System(CVT) .

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.

   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. Relay check:

   - 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 CL- line):

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

   - 2. Jump the SCS line with the HDS.

   SCS Short

   - 3. Disconnect the following connector.

   PCM connector A (51P)

   - 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 point 1	PCM connector A (51P) No. 19
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the DBW RLY CL- wire between the PCM (A19) and the ETCS control relay.

   NO 

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

4. Shorted wire check (VBDBW/DBW RLY OUT line to power):

   - 1. Disconnect the following connector.

   PCM connector C (51P)

   - 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 point 1	PCM connector C (51P) No. 2
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   Repair a short to power in the VBDBW/DBW RLY OUT wire between the PCM (C2) and the ETCS control relay.

   NO 

   The VBDBW/DBW RLY OUT wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P1658 goes away and the PCM was updated, troubleshooting is complete. If DTC P1658 goes away and the PCM was substituted, replace the original PCM .