Toyota Tundra. Manual — part 1227

INSPECTION PROCEDURE

1. READ DTC OUTPUT

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

d. Read DTCs.

Result

RESULT CHART

If any DTCs other than P0630 are output, troubleshoot those DTCs first.

B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

A : Go to next step.

2. INPUT VIN

a. Input VIN (See REGISTRATION ).

NEXT : END

DTC P0657 ACTUATOR SUPPLY VOLTAGE CIRCUIT/OPEN

DESCRIPTION

The ECM monitors the output voltage to the throttle actuator. This self-check ensures that the ECM is
functioning properly. The output voltage is usually 0 V when the ignition switch is turned OFF. If the output
voltage is higher than 7 volts when the ignition switch is turned OFF, the ECM will illuminate the MIL and set
a DTC when the ignition switch is turned ON.

DTC TROUBLE DETECTION CONDITION CHART

MONITOR STRATEGY

Display (DTC Output) Proceed To

P0630

A

P0630 and other DTCs

B

NOTE:

If P0630 is set, the VIN must be input to the ECM using the
Techstream. However, all DTCs are cleared automatically by the
Techstream when inputting the VIN. If DTCs other than P0630 are set,
check them first.

DTC No.

DTC Detection Condition

Trouble Area

P0657

Throttle actuator power supply error

ECM

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

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.

1. CHECK DTC

a. Clear DTC (See DTC CHECK/CLEAR ).

b. Turn the ignition switch OFF.

c. Disconnect the cable from the battery negative (-) terminal and wait for 1 minute.

d. Connect the cable to the battery negative (-) terminal.

e. Turn the ignition switch ON for 10 seconds.

f. Turn the ignition switch OFF.

g. Turn the ignition switch ON.

h. Connect the Techstream to the DLC3.

i. Turn the Techstream ON.

j. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

k. Check DTC.

OK: P0657 is not present.

Related DTCs

None

Required sensors/Components (Main)

ECM

Required sensors/Components (Related)

Throttle actuator

Frequency of operation

Once per driving cycle

Duration

Within 1 second

MIL operation

Immediate

Sequence of operation

None

Ignition switch

ON to OFF

Throttle actuator power supply

7 V or more

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

NG : REPLACE ECM (See REMOVAL )

OK : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

DTC P0724 BRAKE SWITCH "B" CIRCUIT HIGH

DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling when brakes are suddenly applied while driving
in lock-up condition.

When the brake pedal is depressed, this switch sends a signal to the ECM. Then the ECM cancels the operation
of the lock-up clutch while braking is in progress.

DTC TROUBLE DETECTION CONDITION CHART

MONITOR DESCRIPTION

This DTC indicates that the stop light switch remains ON. When the stop light switch remains ON during "stop
and go" driving, the ECM interprets this as a fault in the stop light switch and the MIL comes on and the ECM
stores the DTC. The vehicle must stop (less than 1.86 mph [3 km/h]) and go (18.65 mph [30 km/h] or more) 5
times during 2 driving cycles, in order to detect a malfunction.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

The stop light switch remains ON during GO and STOP 5 times.

DTC

No.

DTC Detection Condition

Trouble Area

P0724

Stop light switch remains ON even when vehicle repeats 5 cycles of
STOP (less than 1.86 mph [3 km/h]) and GO (18.65 mph [30 km/h] or
more) (2 trip detection logic)



Short in stop light
switch signal
circuit



Stop light switch



ECM

Related DTCs

P0724: Stop light switch/Range check/Rationality

Required sensors/Components (Main)

Stop light switch

Required sensors/Components (Related)

Speed sensor

Frequency of Operation

Continuous

Duration

5 times

MIL Operation

2 driving cycles

Sequence of Operation

None

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

GO and STOP are defined as follows;

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Refer to DTC P0504 .

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.

1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/Stop Light Switch.

d. Read the values displayed on the Techstream.

OK

DATA LIST

NG : Go to step 2

OK : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

Monitor runs whenever following DTCs not present

None

GO: Vehicle speed

18.65 mph (30 km/h) or more

STOP: Vehicle speed

Less than 1.86 mph (3 km/h)

Stop light switch status

Stuck ON

Tester Display

Measurement Item/Range

(display)

Normal Condition

Diagnostic

Note

Stop Light

Switch

Stop light switch status/ON or

OFF



ON: Brake pedal is
depressed



OFF: Brake pedal is
released

-

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra