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DI-706
DIAGNOSTICS - ENGINE (2UZ-FE)
DICN8-02
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
ST1-. 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
ST1- 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 ST1- signal is OFF S ECM
DI-707
DIAGNOSTICS - ENGINE (2UZ-FE)
WIRING DIAGRAM
Access Cab, Standard Cab: I23 Ignition SW Driver Side J/B J9
ECU-IG J/C
IG1 4 B-Y 2 13
2 AM1 GR-R (*3)
1I 1G
E
E
J66
IGN J/C
4 11
7 AM2 IG2 6 B-R B-O B-O
1I 1F
H H
W W-R
S4 GR-R (*3)
7 IA9 8 IA9 Stop Light SW
ECU
G-Y (*4)
1
2
16
B
E3 ST1-
3 4
G-Y (*3)
G-Y (*3) G-W
1F 2 1 5 J10
Driver Side J/B
J/C C
15
S31 4 C C
STOP Stop Light Relay E3 STP
G-W (*3) G-W
C
2 3 G-W (*3)
1K 2 V G-W (*4)
Driver Side J/B
W W-R
4 1D
W-G To Skid
Control ECU
2 2 2
1D 3 5 1H
2 2 2 G-W G-W
Engine Room R/B
J/B AM1 AM2
4 IC2 8 BB5
1 1 1 1 G-W G-W
H10
2 Hight Mounted
140A ALT (*1) Stop Light G-W
2 W-B G-W
Driver Side J/B
100A ALT (*2) R4 4 4
2 1A R5 Stop
1 Stop
Light
Light
LH 3 3 RH
2 W-B W-B
8 1J
B-L (*1)
B (*2) *1: Towing Package A W-B
*2: Except Towing Package J3 W-B
*3: w/ VSC J/C
Battery *4: w/o VSC
IF BL
A23601
DI-708
DIAGNOSTICS - ENGINE (2UZ-FE)
Double Cab: S4
W (*1) Sop Light SW
W (*2)
Driver Side J/B Sub J/B No.3 J75 4 1 ECM
IGN1 J/C
2 17 5 5 16
B-O B-O B-O G
1C 1E 3B 3A E3 ST1-
B B 2 3
I23 Ignition SW Driver Side J/B Engine Room J/B
B-R
3 7 1 AM2 1
IG2 AM2 W-R W-R B
1C 1J 2C 2D
6 5
Driver Side J/B F13 FL Block 10
6 AM1 1 ALT
IG1 AM1 W-L W
1C 1L
2 1 2 1 2
2 STOP
1F 12
W-R
B
B-Y Driver Side J/B Sub J/B Sub J/B
4 ECU-IG 4 4 3 8 18
B-R B-R
1C 1F 3A 3D 4A 4A
(*1) (*1)
S31 Stop Light Relay
L-B (*1) B-R (*1)
To Skid Control ECU
2 1
W(*1)
3
5
4 G-W (*1)
G-W
G-W (*2) W-R (*1)
E J48 B J47 B J47
J/C J/C
8 BP3 G-W G-W D J47 B J48 B J48
B G-W
G-W W-R (*1)
G-W E J38
R4 15
4 G-W 4 R5
J/C W-R
Rear Rear E3 STP
Combination Combination
Ligh RH
L J39
Ligh LH 3 W-B 3 W-B 1 H10
High Mounted
W-B Stop Light
To Skid Control ECU
2 W-B
Battery BS BR
*1: w/ VSC
*2: w/o VSC
A23602
DI-709
DIAGNOSTICS - ENGINE (2UZ-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 operated 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-710
DIAGNOSTICS - ENGINE (2UZ-FE)
3 Check STP signal and ST1- voltage.
PREPARATION:
ON
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch 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(-) ST1- (+) B17446
( ) ( ) Measure the voltage between the specified terminals of the E3
and E5 ECM connectors.
OK:
Standard:
Tester Connection Brake Pedal Specified Condition
ST1- (E3-16) -
Depressed Below 1.5 V
E1 (E5-1)
ST1- (E3-16) -
Released 7.5 to 14 V
E1 (E5-1)
OK Check for intermittent problems
(See page DI-430).
NG
DI-711
DIAGNOSTICS - ENGINE (2UZ-FE)
4 Check harness and connector between ECM and stop light switch.
PREPARATION:
Wire Harness Side:
(a) Disconnect the S4 stop light switch connector.
Stop Light Switch Connector
(b) Disconnect the E3 ECM connector.
S4
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester Connection Specified Condition
E3 Stop light switch (S4-1) - STP (E3-15) Below 1
Stop light switch (S4-3) - ST1- (E3-16) Below 1
Stop light switch (S4-1) or
10 k or higher
STP (E3-15) - Body ground
Stop light switch (S4-3) or
10 k or higher
ST1- (E3-16) - Body ground
ST1- STP
B17447
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-82).
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