DTC Troubleshooting: P1659 - Honda FIT GK 2014-2020

1.

Problem verification:

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):

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.

Relay check:

Relay check

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

?2.	Test the ETCS control relay.

Is the 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):

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

Is there battery voltage?


	YES

Go to step 5.


	NO

Replace the under-hood fuse/relay box.?

5.

Open wire check (+B DBW line):

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

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):

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. 2

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 (C2) and the ETCS control relay.?

7.

Open wire check (DBW RLY CL- line):

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. 19

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 (A19) and the ETCS control relay.?

8.

Shorted wire check (VBDBW/DBW RLY OUT line):

Shorted wire check (VBDBW/DBW RLY OUT line)

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

?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. 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 ETCS control relay.?


	NO

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

9.

Shorted wire check (+B DBW line):

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

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.?