Workshop Manual

6E–375
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P01571 No Brake Switch Signal
Step Action Value(s) Yes No
1 Was the “On-Board Diagnostic (OBD) System Check”
performed?
— Go to Step 2
Go to OBD
System
Check
2 1. Ignition “Off”.
Engine “Off”.
2. Check following fuses.
B BACK 15A
B STOP LAMP 15A
Was a problem found?
— Verify repair Go to Step 3
3 1. Make adjustment to the brake switch.
The brake switch is installed to the brake pedal
assembly. (Refer to “Brake switch” in “10A CRUISE
CONTROL SYSTEM”. )
Was the problem found?
— Verify repair Go to Step 4
4 1. Push the shaft at brake switch.
2. Check shaft operation for smooth movements.
Was the problem found?
— Verify repair Go to Step 5
5 1. Disconnect the connector at brake switch.
2. Check following terminal pin at ohmmeter.
(Leave the shaft position at brake switch. Don’t
push it.)
B Between pin 1 and pin 2
B Between pin 3 and pin 4
Was it specified value?
Between pin1
and pin2 is
0W, Between
pin3 and pin4
is ∞W
Go to Step 6 Go to Step 9
6 1. Disconnect the connector at brake switch.
2. Check following terminal pin at ohmmeter.
(Push the shaft position at brake switch and hold it)
B Between pin 1 and pin 2
B Between pin 3 and pin 4
Was it specified value?
Between pin1
and pin2 is
∞W, Between
pin3 and pin4
is 0W
Go to Step 7 Go to Step 9
7 1. Probe related circuits for open or short to ground.
2. If a problem was found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 8
8 1. Replace the ECM.
IMPORTANT: The replacement PCM must be
programmed. Refer to On-Vehicle Service in
Powertrain Control Module and Sensors for
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Was the action completed?
— Verify repair —
9 1. Replace the brake switch.
Was the action completed?
— Verify repair —