Toyota Celica 2005 Repair Manual page 760

4 Check voltage between terminal STP and ST1− of ECM and body ground.
ON
Brake Pedal
Depressed
ST1−
( )
NG
5 Check harness and connector between ECM and stop light switch (See page
IN−30).
OK
Replace ECM (See page SF−78).
2005 CELICA (RM1131U)
DIAGNOSTICS
PREPARATION:
Turn the ignition switch ON.
CHECK:
Brake Pedal
Check voltage between terminal STP and ST1− of ECM and
Release
body ground.
OK:
STP
A19642
( )
− ENGINE (2ZZ−GE)
Brake Pedal
Depressed
Released
OK Check for intermittent problems (See page
DI−295).
NG Repair or replace harness or connector.
759
STP Voltage ST1− Voltage
7.5 to 14 V Below 1.5 V
Below 1.5 V
DI−561
7.5 to 14 V