Toyota Tundra. Manual — part 1215

DTC P0500 VEHICLE SPEED SENSOR "A"

DESCRIPTION

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid
control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM via the
combination meter. The ECM determines the vehicle speed based on the frequency of these pulse signals.

Fig. 163: Vehicle Speed Sensor Communication Diagram

DTC TROUBLE DETECTION CONDITION CHART

MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven, when the indicated engine speed is more than 2300 RPM
and 30 seconds have elapsed since the Park/Neutral Position (PNP) switch was turned OFF. If there is no speed
signal from the combination meter despite these conditions being met, the ECM interprets this as a malfunction
in the speed signal circuit. The ECM then illuminates the MIL and sets the DTC.

MONITOR STRATEGY

MONITOR STRATEGY

DTC

No.

DTC Detection Condition

Trouble Area

P0500

While vehicle being driven, no vehicle speed sensor signal
transmitted to ECM (2 trip detection logic)



Open or short in speed
signal circuit



Wheel speed sensor



Combination meter



ECM



Skid control ECU

Related DTCs

P0500: Vehicle speed sensor "A" pulse input error

Required
Sensors/Components
(Main)

Vehicle Speed Sensor (VSS), Combination meter and Skid control ECU

Required

Park/Neutral Position (PNP) switch, Engine Coolant Temperature (ECT)

2008 Toyota Tundra

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

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Fig. 164: Vehicle Speed Sensor 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

Sensors/Components
(Related)

sensor, Crankshaft Position (CKP) sensor, Throttle Position (TP) sensor and
Mass Air Flow (MAF) meter

Frequency of Operation

Continuous

Duration

5 seconds

MIL Operation

2 trip detection logic

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Time after ignition switch OFF to ON

3 seconds or more

Vehicle speed at output speed sensor

5.59 mph (9 km/h) or more

Battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

Vehicle speed sensor signal

No pulse input

2008 Toyota Tundra

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

from the time the malfunction occurred.

1. CHECK OPERATION OF SPEEDOMETER

a. Drive the vehicle and check whether the operation of the speedometer in the combination meter is

normal.

HINT:



The vehicle speed sensor is operating normally if the speedometer reading is normal.



If the speedometer does not operate, check it by following the procedure described in
Speedometer Malfunction. (See SPEEDOMETER MALFUNCTION ).

NG : GO TO MALFUNCTION IN SPEEDOMETER . (See SPEEDOMETER MALFUNCTION ).

OK : Go to next step.

2. READ VALUE USING TECHSTREAM (VEHICLE SPEED)

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/Data List/All Data/Vehicle Speed.

e. Drive the vehicle.

f. Read the value displayed on the Techstream.

OK: Vehicle speeds displayed on Techstream and speedometer display are equal.

NG : Go to step 3

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

3. CHECK COMBINATION METER ASSEMBLY (+S VOLTAGE)

a. Disconnect the J28 combination meter connector.

b. Measure the voltage according to the value(s) in the table below.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

NG : Go to step 5

Tester Connection

Switch Condition Specified Condition

J28-35 (+S) - Body ground Ignition switch ON

4.5 to 5.5 V

2008 Toyota Tundra

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

Fig. 165: Identifying J28 Combination Meter Connector Terminals

OK : Go to next step.

4. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)

a. Move the shift lever to the neutral position.

b. Jack up the vehicle.

c. Check the voltage between the terminal of the combination meter and the body ground while the

wheel is turned slowly.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

HINT:

The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is
turned slowly.

NG : REPLACE COMBINATION METER ASSEMBLY . (See COMBINATION METER ).

Tester Connection

Switch Condition

Specified Condition

J28-35 (+S) - Body ground Ignition switch ON Voltage generated intermittently

2008 Toyota Tundra

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