Toyota Tundra (2015 year). Manual — part 1576
A
(a) Move the shift lever to the neutral position.
(b) Jack up the vehicle.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J28-29 (+S) - Body ground
Ignition switch ON
Wheel is turned slowly
Voltage generated intermittently
Result
RESULT
PROCEED TO
NG
A
OK
B
HINT:
REPLACE ECM
6.
CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL INPUT WAVEFORM)
(a) Move the shift lever to the neutral position.
(b) Jack up the vehicle.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J28-30 (SI) - Body ground
Ignition switch ON
Wheel is turned slowly
Voltage generated intermittently
Result
RESULT
PROCEED TO
NG
A
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0500; Vehic...
A
RESULT
PROCEED TO
OK
B
HINT:
The output voltage should fluctuate up and down, similarly to the diagram, when a wheel is turned
slowly.
B
REPLACE COMBINATION METER ASSEMBLY
7.
CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL
ECU)
(a) Disconnect the J28 combination meter connector.
(b) Disconnect the A17 skid control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J28-30 (SI) - A17-3 (SP1)
Always
Below 1 Ω
J28-30 (SI) or A17-3 (SP1) - Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE VSC ACTUATOR ASSEMBLY
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0500; Vehic...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000XCT139X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0504; Brake Switch "A" / "B" Correlation; 2015 MY
Tundra [08/2014 - ]
DTC
P0504
Brake Switch "A" / "B" Correlation
DESCRIPTION
The stop light switch is a duplex system that transmits two signals: STP and ST1-. These two signals are used
by the ECM to monitor whether or not the brake system is working properly. If the signals, which indicate the
brake pedal is being depressed and released, are detected simultaneously, the ECM interprets this as a
malfunction in the stop light switch and stores the DTC.
HINT:
The normal signal conditions are as shown in the table below.
SIGNAL (ECM TERMINAL)
BRAKE PEDAL RELEASED
IN TRANSITION
BRAKE PEDAL DEPRESSED
STP
OFF
ON
ON
ST1-
ON
ON
OFF
[OFF] denotes ground potential.
[ON] denotes battery potential (+B).
On the Techstream, both the Data List items Stop Light Switch and ST1 are ON when the brake
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0504
Conditions (a), (b) and (c) continue for 0.5 seconds or
more
(1 trip detection logic):
(a) Ignition switch ON
(b) Brake pedal released
(c) STP signal OFF when ST1- signal OFF
Short in stop light switch signal
circuit
STOP fuse
IGN fuse
Stop light switch
ECM
WIRING DIAGRAM
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0504; Brak...
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and
other data from the time the malfunction occurred.
Stop light switch conditions can be checked using the Techstream.
Connect the Techstream to the DLC3.
a.
Turn the ignition switch to ON.
b.
Turn the Techstream on.
c.
Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch and
ST1.
d.
Check the Data List indication when the brake pedal is depressed and released.
e.
BRAKE PEDAL OPERATION
STOP LIGHT SWITCH
ST1
Depressed
ON
ON
Released
OFF
OFF
PROCEDURE
1.
CHECK STOP LIGHT SWITCH ASSEMBLY (B+ VOLTAGE)
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0504; Brak...
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