DTC P1658

DTC P1658  : ETCS Control Relay ON Malfunction

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Do the ETCS TEST with the HDS.

   ETCS (TAC) 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 ETCS control relay OK?

   YES 

   The ETCS control relay is OK. 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.

   -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. 50
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the DBW RLY CL- wire between the PCM (A50) and the throttle body.

   NO 

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

4. Shorted wire check (DBW RLY OUT/VBDBW 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. 1
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   Repair a short to power in the DBW RLY OUT/VBDBW wire between the PCM (C1) and the ETCS control relay.

   NO 

   The DBW RLY OUT/VBDBW 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 .