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DI-261
DIAGNOSTICS - ENGINE (1GR-FE)
DIDTT-01
DTC P0504 Brake Switch "A"/"B" Correlation
CIRCUIT DESCRIPTION
In addition to turning on the stop lamps, the stop lamp switch signals are used for a variety of engine, trans-
mission, and suspension functions as well as being an input for diagnostic checks. It is important that the
switch operates properly, therefore this switch is designed with two complementary signal outputs: STP and
STI-. The ECM analyzes these signal outputs to detect malfunctions in the stop lamp switch.
HINT:
Normal condition is as shown in the table.
Signal Brake pedal released In transition Brake pedal depressed
STP OFF ON ON
STI- ON ON OFF
DTC No. DTC Detection Condition Trouble Area
Conditions (a), (b) and (c) continue for 0.5 sec. or more: S Short in stop lamp switch signal circuit
(a) Ignition switch ON S Stop lamp fuse
P0504
(b) Brake pedal released S Stop lamp switch
(c) STP signal is OFF when the STI- signal is OFF S ECM
DI-262
DIAGNOSTICS - ENGINE (1GR-FE)
WIRING DIAGRAM
I23 Ignition SW Driver Side J/B J9
2 ECU-IG J/C
13
2 B-Y GR-G (*3)
4 1I 1G
E
E
Driver Side J/B J66
IGN J/C
4 11
B-R 1I 1F B-O B-O
W 7 6 H H
W-R
S4
7 IA9 8 IA9 GR-G (*3) Stop Light SW
ECM
G-Y (*4)
1
2 16
Driver B
E3 STI-
Side G-Y (*3) G-Y (*3) 3 4
G-W
J/B
1F 2 1 5 J10
S31 C J/C
15
Stop Light 4 G-W (*3) G-W
STOP C C E3 STP
Relay
C
2 3
V G-W (*3) G-W (*4)
1K 2
Driver Side J/B
W-G W W-R
4 1D
To Skid
2 2 2 Control ECU
2 2 2
1D 3 5 1H
J/B AM1 AM2
G-W G-W
Engine
1 1 1 Room 4 IC2 8 BB5
2
R/B G-W
1 G-W
ALT
G-W G-W
1 2 W-B 4 4
2 1A
2 R4
Stop 3 3
Light LH W-B W-B
B-L (*1)
8 1J
B (*2)
A W-B
*1: Towing Package J3 W-B
*2: Except Towing Package J/C
Battery *3: w/ VSC
*4: w/o VSC IF BL
cmc0486
DI-263
DIAGNOSTICS - ENGINE (1GR-FE)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Check operation of stop light.
CHECK:
Check if the stop lights come on and go off normally when the brake pedal is depressed and released.
NG Check and repair stop light circuit.
OK
2 Check stop light switch (See page BE-70).
NG Replace stop light switch.
OK
DI-264
DIAGNOSTICS - ENGINE (1GR-FE)
3 Check STP signal and STI- voltage.
PREPARATION:
ON
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON.
Brake Pedal Brake Pedal
(c) Select the item "DIAGNOSIS / ENHANCED OBD II /
Depressed Released
DATA LIST / ALL / STOP LIGHT SW".
CHECK:
Read the signal displayed on the hand-held tester.
OK:
E5 E3 Standard:
Brake Pedal Specified Condition
Depressed STP Signal ON
Released STP Signal OFF
CHECK:
E1(-) STI- (+) B17446
( ) ( ) Measure the voltage between the specified terminals of the E3
and E5 ECM connectors.
OK:
Standard:
Tester Connection Brake Pedal Specified Condition
STI- (E3-16) -
Depressed Below 1.5 V
E1 (E5-1)
STI- (E3-16) -
Released 7.5 to 14 V
E1 (E5-1)
OK Check for intermittent problems (See page
DI-11).
NG
DI-265
DIAGNOSTICS - ENGINE (1GR-FE)
4 Check harness and connector between ECM and stop light switch.
PREPARATION:
Wire Harness Side:
(a) Disconnect the S4 stop light switch connector.
(b) Disconnect the E3 ECM connector.
S4
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Stop Light Switch Connector Standard:
Tester Connection Specified Condition
E3 Stop light switch (S4-1) - STP (E3-15) Below 1
Stop light switch (S4-4) - STI- (E3-16) Below 1
Stop light switch (S4-1) or
10 k or higher
STP (E3-15) - Body ground
Stop light switch (S4-4) or
10 k or higher
STI- (E3-16) - Body ground
STI- STP
A23478
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-66).
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