DTC P0703
DTC P0703 : Brake Pedal Position Switch (NC) Malfunction
- 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 Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P0703 Brake Pedal Position Switch (NC) Malfunction |
DTC (PGM-FI)
- 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 Data List
Do the current condition(s) match the threshold?
YES
Go to step 7.
NO
Go to step 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 Data List
Do the current condition(s) match the threshold?
YES
The failure is not duplicated.
NO
Go to step 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: -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 Data List
Do the current condition(s) match the threshold?
YES
Replace the brake pedal position switch .
NO
Go to step 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 Is there battery voltage?
YES
Go to step 5.
NO
Go to step 6.
- 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: -5. Exit the SCS mode with the HDS.
-6. Turn the vehicle to the ON mode.
-7. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Brake pedal position switch 4P connector: disconnected Brake pedal position switch 4P connector No. 2 and No. 3: jumped PCM connector A (50P): disconnected 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 , then recheck. If DTC P0703 goes away and the PCM was substituted, replace the original PCM .
NO
Repair an open in the BKSWNC wire between the PCM (A49) and the brake pedal position switch.
- Fuse check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Check the No. C21 fuse .
Is the fuse OK?
YES
Repair an open in the IG1 ACG wire between the No. C21 fuse and the brake pedal position switch.
NO
Replace the No. C21 fuse. Also check for a short to ground on the No. C21 fuse circuit if needed.
- 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 Data List
Do the current condition(s) match the 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.
- Brake pedal position switch check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. 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