Automatic Transaxle System

U760E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0500: Vehicle Speed Sensor "A"
P0500 - Vehicle Speed Sensor "A"

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.









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





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM

Speed Signal Circuit

INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

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.

(c) Turn the ignition switch to ON.

(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.

NG -- CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)

OK -- SYMPTOM SIMULATION AND DTC CHECK How To Proceed With Troubleshooting

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:





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

NG -- GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT) Speed Signal Circuit
OK -- Continue to next step.

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

(a) Disconnect the combination meter assembly connector.





(b) Disconnect the TCM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):





(d) Reconnect the combination meter assembly connector.

(e) Reconnect the TCM connector.

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

OK -- REPLACE TCM Removal