Toyota Tundra. Manual — part 1403

RESULT REFERENCE

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. TECHSTREAM

a. Refer to the 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 usually is 0 V when the ignition switch is turned off. If the output
voltage is higher than 7 V when the ignition switch is turned off, the ECM will illuminate the MIL and set a
DTC when the ignition switch is turned to ON.

DTC DETECTION CONDITION AND TROUBLE AREA

MONITOR STRATEGY

MONITOR STRATEGY

Result

Proceed To

P0630 is output

A

P0630 and other DTCs are output

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 the VIN is input. If DTCs other than P0630 are set,
check them first.

DTC Code

DTC Detection Condition

Trouble Area

P0657

Throttle actuator power supply error

ECM

Related DTCs

None

Required sensors/components (main)

ECM

Required sensors/components (sub)

Throttle actuator

Frequency of operation

Once per driving cycle

Duration

Within 1 second

MIL operation

Immediate

Sequence of operation

None

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

1. CHECK DTC

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

b. Turn the ignition switch off.

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

d. Connect the cable to the negative battery terminal.

e. Turn the ignition switch to ON for 10 seconds.

f. Turn the ignition switch off.

g. Turn the ignition switch to ON.

h. Check DTC.

OK: P0657 is not present.

NG : REPLACE ECM (See REMOVAL )

OK : 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 while driving in the lock-up condition when the
brakes are suddenly applied.

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 DETECTION CONDITION AND TROUBLE AREA

Ignition switch

From ON to OFF

Throttle actuator power supply

7 V or higher

DTC

Code

DTC Detection Condition

Trouble Area

P0724

Stop light switch remains ON even when vehicle is driven in GO (30
km/h (18.63 mph) or more) and STOP (less than 3 km/h (1.86 mph))



Short in stop light
switch signal
circuit

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

MONITOR DESCRIPTION

This DTC indicates that the stop light switch remains ON. When the stop light switch remains ON during GO
and STOP driving, the ECM interprets this as a fault in the stop light switch. Then the MIL illuminates and the
ECM stores the DTC. The vehicle must GO (30 km/h (18.63 mph) or more) and STOP (less than 3 km/h (1.86
mph)) 5 times for 2 driving cycles in order for the DTC to be output.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

pattern 5 times (2 trip detection logic)



Stop light switch



ECM

Related DTCs

P0724: Stop light switch/Range check/Rationality

Required sensors/Components

Stop light switch, Vehicle speed sensor

Frequency of operation

Continuous

Duration

GO and STOP 5 times

MIL operation

2 driving cycles

Sequence of operation

None

The monitor will run whenever this DTC is not present.

None

Battery voltage

8 V or higher

Starter

OFF

Ignition switch

ON

GO (Vehicle speed is 30 km/h (18.63 mph) or more)

Once

STOP (Vehicle speed is less than 3 km/h (1.86 mph))

Once

Brake switch

Stuck ON

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 193: Brake Switch "B" Circuit High - Wiring Diagram

INSPECTION PROCEDURE

HINT:

Using the Techstream to read the Data List allows switch, sensor, actuator and other item values to be read
without removing any parts. Reading the Data List early in troubleshooting is one way to save time.

1. Warm up the engine.

2. Turn the ignition switch off.

3. Connect the Techstream to the DLC3.

4. Turn the ignition switch to ON.

5. Turn the Techstream ON.

6. Enter the following menus: Powertrain/Engine and ECT/Data List.

7. Follow the instructions on the Techstream and read the Data List.

DATA LIST REFERENCE

NOTE:

In the table below, the values listed under "Normal Condition" are reference
values. Do not depend solely on these reference values when deciding whether
a part is faulty or not.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra