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

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Vehicle Speed Sensor "A" (P0500)

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.

DTC No.	DTC Detection Condition	Trouble Area
P0500	While vehicle is being driven, no vehicle speed sensor signal transmitted to ECM (1 trip detection logic)	Open or short in speed signal circuit Combination meter ECM

MONITOR DESCRIPTION

If there is no speed signal from the combination meter assembly even though the ECM determines that the vehicle is being driven, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and stores the DTC.

MONITOR STRATEGY

Related DTCs	P0500: Vehicle speed sensor verify pulse input
Required Sensors/Components (Main)	Vehicle speed sensor Combination meter Skid control ECU
Required Sensors/Components (Related)	Park/neutral position switch Engine coolant temperature sensor Crankshaft position sensor Throttle position sensor Mass air flow meter sub-assembly
Frequency of Operation	Continuous
Duration	2 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	-
Battery voltage	8 V or higher
Ignition switch	ON
Starter	Off
Time after ignition switch off to ON	3 seconds or more
Engine	Running
Intermediate shaft speed sensor revolution	300 rpm or higher
Lost communication with TCM (U0101)	Not detected
Either of the following conditions is met	1 or 2
1. All of the following conditions are met	-
Engine coolant temperature	20°C (68°F) or higher
Engine coolant temperature sensor circuit fail	Not detected
Time after park/neutral position switch on to off	2 seconds or more
2. All of the following conditions are met	-
Either of the following conditions is met	(a) or (b)
(a) Engine coolant temperature	Less than 20°C (68°F)
(b) Engine coolant temperature sensor circuit fail	Detected
Time after park/neutral position switch on to off	30 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

Vehicle speed sensor signal

No signal

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).

Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the Techstream on [A].
Start the engine.
Drive the vehicle at 24 km/h (15 mph) or more for a total of 30 seconds or more [B].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Stop the vehicle.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the Pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P0500.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.

If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

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 / Engine / Data List / Vehicle Speed.

(f) Drive the vehicle.

(g) Read the value displayed on the Techstream.

OK:

Vehicle speeds displayed on the Techstream and speedometer display are equal.

CHECK FOR INTERMITTENT PROBLEMS

2.	INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

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

(1) Jack up the vehicle.

(2) Move the shift lever to N.

(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

Turn Wheel

Rear view of wire harness connector

(to 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

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

(a) Disconnect the combination meter connector.

(b) Disconnect the ECM connector.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
E1-16 (+S) - A49-15 (SPD)	Always	Below 1 Ω

REPLACE ECM

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

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