DTC P1659

DTC P1659  : ETCS Control Relay OFF Malfunction

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode.

   -5. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P1659 ECTS Control Relay OFF Malfunction

   DTC (PGM-FI)

   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 electronic throttle control system (ETCS) control relay 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. Fuse check

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

   -2. Check the No. B8 fuse .

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Go to step 7.

3. Relay check

   -1. Remove the electronic throttle control system (ETCS) control relay .

   -2. Test the electronic throttle control system (ETCS) control relay .

   Is the relay OK?

   YES 

   Go to step 4.

   NO 

   Replace the electronic throttle control system (ETCS) control relay.

4. Open wire check (+B DBW line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Electronic throttle control system (ETCS) control relay: removed
   Test point 1	Electronic throttle control system (ETCS) control relay 4P socket (female terminals) 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 5.

   NO 

   Repair an open in the +B DBW wire between the No. B8 fuse and the electronic throttle control system (ETCS) control relay.

5. Open wire check (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 A (50P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Electronic throttle control system (ETCS) control relay: removed
   	PCM connector A (50P): disconnected
   Test point 1	Electronic throttle control system (ETCS) control relay 4P socket (female terminals) No. 2:
   Test point 2	PCM connector A (50P) No. 16

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

   Is there continuity?

   YES 

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

   NO 

   Repair an open in the DBW RLY OUT wire between the PCM (A16) and the electronic throttle control system (ETCS) control relay.

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Electronic throttle control system (ETCS) control relay: removed
   	PCM connector A (50P): disconnected
   Test point 1	Electronic throttle control system (ETCS) control relay 4P socket (female terminals) No. 4:
   Test point 2	PCM connector A (50P) No. 25

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

   Is there continuity?

   YES 

   The DBW RLY CL- wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. 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 (A25) and the electronic throttle control system (ETCS) control relay.

7. Shorted wire check (DBW RLY OUT line)

   -1. Remove the No. B8 fuse.

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. Remove the electronic throttle control system (ETCS) control relay .

   -4. Disconnect the following connectors.

   PCM connector A (50P)

   -5. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electronic throttle control system (ETCS) control relay: removed
   	PCM connector A (50P): disconnected
   Test point 1	PCM connector A (50P) No. 16
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the DBW RLY OUT wire between the PCM (A16) and the electronic throttle control system (ETCS) control relay. Also replace the No. B8 fuse.

   NO 

   The 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
   	Electronic throttle control system (ETCS) control relay: removed
   	PCM connector A (50P): disconnected
   Test point 1	Electronic throttle control system (ETCS) control relay 4P socket (female terminals) 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. B8 fuse and the electronic throttle control system (ETCS) control relay. Also replace the No. B8 fuse.

   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 , then recheck. If DTC P1659 goes away and the PCM was substituted, replace the original PCM . Also replace the No. B8 fuse.