Toyota Tundra. Manual — part 1216
Fig. 166: Checking Voltage Between Terminal Of Combination Meter & Body Ground
OK : Go to next step.
5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)
a. Disconnect the J28 combination meter connector.
b. Disconnect the A24 ECM connector.
c. Measure the resistance according the value(s) in the table below.
Standard resistance (Check for open)
TESTER CONNECTION SPECIFIED CONDITION
Standard resistance (Check for open)
TESTER CONNECTION SPECIFIED CONDITION
NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester Connection
Condition Specified Condition
J28-35 (+S) - A24-13 (SPD) Always
Below 1 ohms
Tester Connection
Condition Specified Condition
J28-35 (+S) or A24-13 (SPD) - Body ground Always
10 kohms or higher
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
Fig. 167: Identifying J28 Combination Meter Connector Terminals
OK : REPLACE ECM (See REMOVAL )
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 sets the DTC.
HINT:
The normal conditions are as shown in the table below. The signals can be read using the Techstream.
BRAKE PEDAL CONDITION CHART
DTC TROUBLE DETECTION CONDITION CHART
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 seconds or more
Short in stop light switch
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
WIRING DIAGRAM
Fig. 168: Brake Switch Wiring Diagram
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.
STP signal conditions can be checked using the Techstream.
a. Connect the Techstream to the DLC3.
b. Turn the ignition switch ON.
c. Turn the Techstream ON.
d. Enter the following menus: Powertrain/Engine and ECT/All Data/Stop Light Switch.
e. Check the STP signal when the brake pedal is depressed and released.
BRAKE PEDAL CONDITION CHART
P0504
(1 trip detection logic):
a. Ignition switch ON
b. Brake pedal released
c. STP signal OFF when ST1- signal OFF
signal circuit
STOP fuse
IGN fuse
Stop light switch
ECM
Brake Pedal Operation Specified Condition
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
1. CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE)
a. Disconnect the A4 stop light switch connector.
b. Measure the voltage according to the value(s) in the table below.
Standard voltage
TESTER CONNECTION SPECIFIED CONDITION
NG : Go to step 4
Fig. 169: Identifying A4 Stop Light Switch Connector Terminals
OK : Go to next step.
2. INSPECT STOP LIGHT SWITCH ASSEMBLY
a. Remove the stop light switch.
b. Measure the resistance according to the value(s) in the table below.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION
Depressed
STP signal ON
Released
STP signal OFF
Tester Connection Switch Condition Specified Condition
A4-2 - Body ground
Always
11 to 14 V
A4-3 - Body ground Ignition switch ON
11 to 14 V
Tester Connection
Switch Condition
Specified Condition
1 - 2
Switch pin not pushed
Below 1 ohms
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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