Brake Pedal Position Switch Signal Circuit Troubleshooting
Brake Pedal Position Switch Signal Circuit Troubleshooting
1.
Brake pedal position switch signal check 1:

Brake pedal position switch signal check 1
?1.
Press the engine start/stop button to select the ON mode.

?2.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
BRAKE SWITCH
OFF
      

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
2.
Brake pedal position switch signal check 2:

Brake pedal position switch signal check 2
?1.
Press the brake pedal while checking the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
BRAKE SWITCH
ON
      

Do the current condition(s) match the threshold?

     
YES
     
     
     
The brake pedal position switch signal circuit (BKSW line) is OK.?
     
NO
     
     
     
Go to step 3.
3.
Shorted wire check (STOP SW line):

Shorted wire check (STOP SW 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.

?4.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
PCM connector A (51P): disconnected
 
Brake pedal position switch 4P connector: disconnected
Test circuit
STOP SW
Test point 1
PCM connector A (51P) No. 25 (LT GRN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short in the STOP SW wire between the PCM (A25) and the No. A6 (10 A) fuse in the under-hood fuse/relay box. Also, replace the No. A6 (10 A) fuse in the under-hood fuse/relay box.?
     
NO
     
     
     
The STOP SW wire is not shorted. Go to step 4.
4.
Open wire check (STOP SW line):

Open wire check (STOP SW line)
?1.
Connect terminals A and B with a jumper wire.
Terminal A
Brake pedal position switch 4P connector No. 1 (LT GRN)
Terminal B
Body ground


?2.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
PCM connector A (51P): disconnected
 
Brake pedal position switch 4P connector: disconnected
 
Brake pedal position switch 4P connector terminal No. 1: jumped to body ground
Test circuit
STOP SW
Test point 1
PCM connector A (51P) No. 25 (LT GRN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The STOP SW wire is OK. Repair an open in the +B STOP wire between the brake pedal position switch and the No. A6 (10 A) fuse in the under-hood fuse/relay box. If the wire is OK, then inspect the brake pedal position switch.?
     
NO
     
     
     
Repair an open in the STOP SW wire between the PCM (A25) and the brake pedal position switch.?