DTC P1659 (2.4 L Engine) (2017 2018 2019)

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
   P1659 ECTS 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 relay circuit board (PGM-FI subrelay circuit) and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

2. Relay circuit board check

   -1. Remove and test the relay circuit board .

   Is the relay circuit board OK?

   YES 

   Go to step 3.

   NO 

   Replace the relay circuit board .

3. Fuse check

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

   -2. Check the following fuse.

   Fuse	No. A8 (15 A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 4.

   NO 

   Go to step 7.

4. Open wire check (+B DBW line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Relay circuit board: removed
   Test point 1	Relay circuit board connector C (18P) (female terminals) No. 14:
   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 5.

   NO 

   Repair an open in the +B DBW wire between the No. A8 (15 A) fuse in the under-hood fuse/relay box and the relay circuit board. If needed, replace the under-hood fuse/relay box .

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

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

   -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
   	Relay circuit board: removed
   	PCM connector C (51P): disconnected
   Test point 1	Relay circuit board connector C (18P) (female terminals) No. 1:
   Test point 2	PCM connector C (51P) No. 2

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

   Is there continuity?

   YES 

   The VBDBW/DBW RLY OUT wire is OK. Go to step 6.

   NO 

   Repair an open in the VBDBW/DBW RLY OUT wire between the PCM (C2) and the relay circuit board (PGM-FI subrelay circuit).

6. Open wire check (DBW RLY- line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Relay circuit board: removed
   	PCM connector A (51P): disconnected
   Test point 1	Relay circuit board connector C (18P) (female terminals) No. 7:

   Test point 2

   PCM connector A (51P) No. 19

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

   Is there continuity?

   YES 

   The DBW RLY- wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

   NO 

   Repair an open in the DBW RLY- wire between the PCM (A19) and the relay circuit board (PGM-FI subrelay circuit).

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

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

   -2. Disconnect the following connectors.

   PCM connector C (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Relay circuit board: removed
   	PCM connector C (51P): disconnected
   Test point 1	PCM connector C (51P) No. 2
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the VBDBW/DBW RLY OUT wire between the PCM (C2) and the relay circuit board (PGM-FI subrelay circuit). Also replace the No. A8 (15 A) in the under-hood fuse/relay box.

   NO 

   The VBDBW/DBW RLY OUT wire is OK. Go to step 8.

8. Shorted wire check (+B DBW line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Relay circuit board: removed
   	PCM connector C (51P): disconnected
   Test point 1	Relay circuit board connector C (18P) (female terminals) No. 14:
   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. A8 (15 A) fuse in the under-hood fuse/relay box and the relay circuit board. If needed, replace the under-hood fuse/relay box . Also replace the No. A8 (15 A) fuse under-hood fuse/relay box.

   NO 

   The +B DBW wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM . Also replace the No. A8 (15 A) fuse in the under-hood fuse/relay box.