DTC P1659

DTC P1659  : ETCS Control Relay OFF 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. Clear the DTC with the HDS.

   -3. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P1659 ETCS Control Relay OFF Malfunction

   Is DTC P1659 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   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 .

2. Determine possible failure area (+B DBW or VBDBW/DBW RLY OUT line, others)

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

   -2. Check the following fuse.

   Fuse	No. B4 (15 A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Go to step 8.

3. ETCS control relay test

   -1. Remove the ETCS control relay (A) from the under-hood fuse/relay box.

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

   -2. Test the ETCS control relay .

   Is the ETCS control relay OK?

   YES 

   The ETCS control relay is OK. Go to step 4.

   NO 

   Replace the ETCS control relay.

4. Determine possible failure area (under-hood fuse/relay box, others)

   -1. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	ETCS control relay: disconnected
   Test point 1	ETCS control relay 4P socket No. 3
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Go to step 5.

   NO 

   Replace the under-hood fuse/relay box .

5. Open wire check (+B DBW line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	ETCS control relay: disconnected

   Test point 1	ETCS control relay 4P socket No. 1
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The +B DBW wire is OK. Go to step 6.

   NO 

   Repair an open in the +B DBW wire between the No. B4 (15 A) fuse and the ETCS control relay. If needed, replace the under-hood fuse/relay box .

6. Open wire check (VBDBW/DBW RLY OUT line)

   -1. Jump the SCS line with the HDS.

   -2. Disconnect the following connector.

   PCM connector C (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	ETCS control relay: disconnected
   	PCM connector C (51P): disconnected
   Test point 1	ETCS control relay 4P socket No. 2
   Test point 2	PCM connector C (51P) No. 1

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

   Is there continuity?

   YES 

   The VBDBW/DBW RLY OUT wire is OK. Go to step 7.

   NO 

   Repair an open in the VBDBW/DBW RLY OUT wire between the PCM (C1) and the ETCS control relay.

7. Open wire check (DBW RLY CL- line)

   -1. Disconnect the following connector.

   PCM connector A (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	ETCS control relay: disconnected
   	PCM connector C (51P): disconnected
   	PCM connector A (51P): disconnected
   Test point 1	ETCS control relay 4P socket No. 4
   Test point 2	PCM connector A (51P) No. 50

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

   Is there continuity?

   YES 

   The DBW RLY CL- wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P1659 goes away and the PCM was updated, troubleshooting is complete. If DTC P1659 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the DBW RLY CL- wire between the PCM (A50) and the ETCS control relay.

8. Shorted wire check (VBDBW/DBW RLY OUT line)

   -1. Remove the ETCS control relay (A) from the under-hood fuse/relay box.

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

   -2. Jump the SCS line with the HDS.

   -3. Disconnect the following connector.

   PCM connector C (51P)

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

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

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

   Is there continuity?

   YES 

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

   NO 

   The VBDBW/DBW RLY OUT wires are OK. Go to step 9.

9. Shorted wire check (+B DBW line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	ETCS control relay: disconnected
   	PCM connector C (51P): disconnected
   Test point 1	ETCS control relay 4P socket No. 1
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the +B DBW wire between the No. B4 (15 A) fuse and the ETCS control relay. If needed, replace the under-hood fuse/relay box .

   NO 

   The +B DBW wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P1659 goes away and the PCM was updated, troubleshooting is complete. If DTC P1659 goes away and the PCM was substituted, replace the original PCM .