DTC Troubleshooting: P16F4 (V6) - Honda Accord CR/CT 2012-2017

1.

Engine starting check:

Engine starting check

?1.	Try to start the engine.

Does the engine start?


	YES

Go to step 2.


	NO

Go to step 4.

2.

Problem verification:

Problem verification

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Press the engine start/stop button to select the ON mode.

?3.	Clear the DTC with the HDS.

?4.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P16F4 Starter Cut Relay 2 Control Circuit Low Voltage

Is DTC P16F4 indicated?


	YES

The failure is duplicated. Go to step 3.


	NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the relay circuit board and the PCM.?

3.

Shorted wire check (ST CUT RLY2 CL- line):

Shorted wire check (ST CUT RLY2 CL- line)

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connectors.

Relay circuit board connector B (14P)

PCM connector A (51P)

?4.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	Relay circuit board connector B (14P): disconnected
	PCM connector A (51P): disconnected
Test circuit	ST CUT RLY2 CL-
Test point 1	PCM connector A (51P) No. 4 (BRN)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the ST CUT RLY2 CL- wire between the PCM (A4) and the relay circuit board, then do the repair verification.


	NO

The ST CUT RLY2 CL- wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.

4.

Starter system check:

Starter system check

?1.	Press the engine start/stop button to select the ON mode.

?2.	A/T: Move the shift lever to P or N. M/T: Move the shift lever to neutral and press the clutch pedal.

?3.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
STARTER CUT CTRL RETURN	ON

Do the current condition(s) match the threshold?


	YES

Go to step 5.


	NO

Go to the symptom troubleshooting for engine will not start.

5.

Determine possible failure area (PCM, others):

Determine possible failure area (PCM, others)

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connector.

PCM connector A (51P)

?4.	Press the engine start/stop button to select the ON mode.

?5.	A/T: Move the shift lever to P or N. M/T: Move the shift lever to neutral and press the clutch pedal.

?6.

Measure the voltage between test points 1 and 2.

Test condition	ON mode
	PCM connector A (51P): disconnected
Test circuit	ST CUT RLY2 CL-
Test point 1	PCM connector A (51P) No. 4 (BRN)
Test point 2	Body ground

Is there battery voltage?


	YES

Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.


	NO

Go to step 6.

6.

Open wire check (ST CUT RLY2 CL- line):

Open wire check (ST CUT RLY2 CL- line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	ON mode
	PCM connector A (51P): disconnected
Test circuit	ST CUT RLY2 CL-
Test point 1	Relay circuit board connector B (14P) No. 9 (BRN)
Test point 2	Body ground

Is there battery voltage?


	YES

The IG1 ACG wire is OK. Repair an open in the ST CUT RLY2 CL- wire between the PCM (A4) and the relay circuit board, then do the repair verification.


	NO

Go to step 7.

7.

Determine possible failure area (Relay circuit board, others):

Determine possible failure area (Relay circuit board, others)

?1.

Measure the voltage between test points 1 and 2.

Test condition	ON mode
	PCM connector A (51P): disconnected
Test circuit	IG1 ACG
Test point 1	Relay circuit board connector A (8P) No. 4 (PNK)
Test point 2	Body ground

Is there battery voltage?


	YES

Replace the relay circuit board, then do the repair verification.


	NO

Go to step 8.

8.

Fuse check:

Fuse check

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Check the following fuse.

Fuse	No. B13 (15 A)
Location	Under-dash fuse/relay box

Is the fuse OK?


	YES

Go to step 9.


	NO

Replace the No. B13 (15 A) fuse. Press the engine start/stop button to select the ON mode, then OFF mode. If the fuse blows again, repair short to body ground on the No. B13 (15 A) fuse circuit, then do the repair verification.

9.

Open wire check (IG1 ACG line):

Open wire check (IG1 ACG line)

?1.

Disconnect the following connectors.

Relay circuit board connector A (8P)

Under-dash fuse/relay box connector F (18P)

?2.

Connect terminals A and B with a jumper wire.

Terminal A	Under-dash fuse/relay box connector F (18P) No. 11 (PNK)
Terminal B	Body ground

?3.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	Relay circuit board connector A (8P): disconnected
	PCM connector A (51P): disconnected
	Under-dash fuse/relay box connector F (18P) No. 11 (PNK): jumped to body ground
Test circuit	IG1 ACG
Test point 1	Relay circuit board connector A (8P) No. 4 (PNK)
Test point 2	Body ground

Is there continuity?


	YES

The IG1 ACG wire is OK. Replace the under-dash fuse/relay box, then do the repair verification.


	NO

Repair an open in the IG1 ACG wire between the under-dash fuse/relay box and the relay circuit board, then do the repair verification.

Repair verification:

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Reconnect all connectors.

?3.	Exit the SCS mode with the HDS.

?4.	Press the engine start/stop button to select the ON mode.

?5.	Reset the PCM with the HDS.

?6.	Do the PCM idle learn procedure.

?7.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P16F4 Starter Cut Relay 2 Control Circuit Low Voltage

Is DTC P16F4 indicated?


	YES

Check for poor connections or loose terminals at the relay circuit board and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.


	NO

If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?