Toyota Venza: Vehicle Speed Sensor "A" (P0500)

Toyota Venza Service Manual / U660e Automatic Transmission / Transaxle / Automatic Transaxle System / Vehicle Speed Sensor "A" (P0500)

DESCRIPTION

The speed sensors detect the wheel speed and send 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 TCM via the combination meter. The TCM determines the vehicle speed based on the frequency of these pulse signals.

DTC No.	DTC Detection Condition	Trouble Area
P0500	When the ECT sensor is normal and the counter gear speed is 300 rpm or more, the vehicle speed signal is not input for 2 seconds or more.	Open or short in vehicle speed signal circuit Combination meter Vehicle speed sensor (Brake control system) Skid control ECU (Brake control system) TCM

MONITOR DESCRIPTION

The TCM assumes that the vehicle is being driven when the transmission counter gear indicates more than 300 rpm and over 30 seconds have passed since the park/neutral position switch was turned off. If there is no vehicle speed signal with these conditions satisfied, the TCM concludes that there is a vehicle speed signal malfunction. The TCM will turn on the MIL and a DTC will be set.

MONITOR STRATEGY

Related DTCs	P0500: Vehicle Speed Sensor Circuit
Required sensors/components (Main)	Vehicle speed sensor, Combination meter, ABS ECU
Required sensors/components (Sub)	Counter gear Speed (CS) sensor, ECT sensor
Frequency of operation	Continuous
Duration	2 seconds
MIL operation	Immediately
Sequence operation	None

TYPICAL ENABLING CONDITIONS

Engine	Running
Intermediate shaft speed sensor revolution (Counter gear revolution)	300 rpm or more
Battery voltage	8 V or more
Ignition switch	ON
Starter	OFF
Either a or b is met (See below)
a. All of the following conditions are met
ECT	20°C (68°F) or more
ECT sensor circuit fail	Not detected
Time after PNP switch ON to OFF	2 sec. or more
b. All of the following conditions are met
ECT	Less than 20°C (68°F)
ECT sensor circuit fail	Detected
Time after PNP switch ON to OFF	30 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

Vehicle speed sensor signal

No pulse input

WIRING DIAGRAM

See page

When a DTC P0500 is output, a ground short in the wiring of terminal SPD or an internal ground short in the relevant ECU is suspected.

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

PROCEDURE

1.	READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Drive the vehicle and check whether the operation of the speedometer in the combination meter assembly 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 for a speedometer malfunction.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / ECT / Data List / Vehicle Speed.

(f) Drive the vehicle.

(g) Read the value displayed on the Techstream.

OK:

Vehicle speeds displayed on tester and speedometer display are equal.

SYMPTOM SIMULATION AND DTC CHECK

2.	CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)

(a) Inspect the combination meter assembly using an oscilloscope.

(1) Move the shift lever to N.

(2) Jack up the vehicle.

(3) Turn the ignition switch to ON.

(4) Measure the voltage between the terminal of the combination meter assembly and the body ground while the wheel is turned slowly.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
E1-16 (+S) - Body ground	Ignition switch ON	Voltage generated intermittently

Text in Illustration

*1	Component with harness connected (Combination Meter Assembly)

HINT:

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

GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT)

3.	CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TCM)

(a) Disconnect the combination meter assembly connector.

(b) Disconnect the TCM connector.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
E1-16 (+S) - B40-3 (SPD)	Always	Below 1 Ω

Text in Illustration

Front view of wire harness connector

(to Combination Meter Assembly)

Front view of wire harness connector

(to TCM)

(d) Reconnect the combination meter assembly connector.

(e) Reconnect the TCM connector.

REPLACE TCM

REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ASSEMBLY - TCM)

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