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 SystemsHow to Troubleshoot the CVT System(CVT System) .

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-dash 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. Jump the SCS line with the HDS, and wait more than 1 minute.

  - 2. Disconnect the following connector.

  PCM connector A (51P)

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

  Test condition	Vehicle OFF (LOCK) mode
  	PCM connector A (51P): disconnected
  	ETCS control relay: 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
  	PCM connector A (51P): disconnected

  	ETCS control relay: 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 .