DTC P0703

DTC P0703  : Brake Pedal Position Switch (NC) Malfunction

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• If the accelerator pedal is pressed with pressing the brake pedal lightly and continuously for 5 minutes or more, this DTC will be stored.

DTC (PGM-FI)

1. Brake pedal position switch signal (BKSWNC) check 1

   -1. Turn the vehicle to the ON mode.

   -2. Check the parameter(s) below with the HDS without pressing the brake pedal.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Cruise Brake Sw/Idle Stop Sw	CLOSE

   Do the current condition(s) match the malfunction threshold?

   YES 

   Go to step 7.

   NO 

   Go to step 2.

2. Brake pedal position switch installation check

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

   -2. Adjust the brake pedal and the brake pedal position switch .

   -3. Turn the vehicle to the ON mode.

   -4. Check the parameter(s) below with the HDS without pressing the brake pedal.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Cruise Brake Sw/Idle Stop Sw	CLOSE

   Do the current condition(s) match the threshold?

   YES 

   The failure is not duplicated.

   NO 

   Go to step 3.

3. Determine possible failure area (brake pedal position switch, others)

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

   -2. Disconnect the following connector.

   Brake pedal position switch 4P connector

   -3. Connect terminals A and B with a jumper wire.

   Terminal A	Brake pedal position switch 4P connector (female terminals) No. 2:
   Terminal B	Brake pedal position switch 4P connector (female terminals) No. 3:

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

   -4. Turn the vehicle to the ON mode.

   -5. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Cruise Brake Sw/Idle Stop Sw	CLOSE

   Do the current condition(s) match the malfunction threshold?

   YES 

   Replace the brake pedal position switch .

   NO 

   Go to step 4.

4. Determine possible failure area (IG1_ACG line, others)

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

   -2. Remove the jumper wire from the brake pedal position switch 4P connector.

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Brake pedal position switch 4P connector: disconnected
   Test point 1	Brake pedal position switch 4P connector (female terminals) No. 3:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Go to step 5.

   NO 

   Go to step 6.

5. Open wire check (BKSWNC line)

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

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

   -3. Disconnect the following connector.

   PCM connector A (50P)

   -4. Connect terminals A and B with a jumper wire.

   Terminal A	Brake pedal position switch 4P connector (female terminals) No. 2:
   Terminal B	Brake pedal position switch 4P connector (female terminals) No. 3:

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

   -5. Turn the vehicle to the ON mode.

   -6. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Brake pedal position switch 4P connector: disconnected
   	PCM connector A (50P): disconnected
   	Brake pedal position switch 4P connector No. 2 and No. 3: jumped
   Test point 1	PCM connector A (50P) No. 49
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The BKSWNC 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 BKSWNC wire between the PCM (A49) and the brake pedal position switch.

6. Fuse check

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

   -2. Check the following fuse.

   Fuse

   No. D21

   Is the fuse OK?

   YES 

   Repair an open in the IG1_ACG wire between the No. D21 fuse and the brake pedal position switch.

   NO 

   Replace the No. D21 fuse. Also check for a short to ground on the No. D21 fuse circuit if needed.

7. Brake pedal position switch signal (BKSWNC) check 2

   -1. Press the brake pedal.

   -2. Check the parameter(s) below with the HDS while pressing the brake pedal.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Cruise Brake Sw/Idle Stop Sw	OPEN

   Do the current condition(s) match the malfunction threshold?

   YES 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the brake pedal position switch 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 .

   NO 

   Go to step 8.

8. Brake pedal position switch check

   -1. Test the brake pedal position switch .

   Is the switch OK?

   YES 

   The brake pedal position switch is OK. Repair a short to power in the BKSWNC wire between the PCM (A49) and the brake pedal position switch.

   NO 

   Replace the brake pedal position switch .