Cruise Control System

CRUISE CONTROL: CRUISE CONTROL SYSTEM: P0500: Vehicle Speed Sensor Circuit Malfunction

DTC P0500 - Vehicle Speed Sensor Circuit Malfunction

DTC P0503 - Vehicle Speed Sensor Circuit Malfunction

DESCRIPTION

The vehicle speed is detected using the No. 1 vehicle speed sensor. The No. 1 vehicle speed sensor transmits a 4-pulse signal for every revolution of the rotor shaft, which is rotated by the transaxle output shaft via the driven gear. The 4-pulse signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter. The signal is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of the pulse signal.









MONITOR DESCRIPTION

Automatic Transaxle Models

The ECM assumes that the vehicle is being driven, when the indicated engine speed is more than 2,300 rpm and 30 seconds have elapsed since the Park/Neutral Position (PNP) switch was turned OFF (typical example values). 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.

Manual Transaxle Models

The ECM assumes that the vehicle is being driven, when a high engine load or fuel cut with the accelerator pedal released continues for 5 seconds or more. If there is no speed signal from the combination meter, despite this condition 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





TYPICAL ENABLING CONDITIONS

M/T Case 1:





M/T Case 2:





A/T:





TYPICAL MALFUNCTION THRESHOLDS










WIRING DIAGRAM





INSPECTION PROCEDURE

HINT: Read freeze frame data using a Techstream. Freeze frame data record 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, from the time the malfunction occurred.

PROCEDURE

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 for Hatchback Speedometer Malfunction or Sedan Speedometer Malfunction.

NG -- GO TO MALFUNCTION IN SPEEDOMETER
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (VEHICLE SPEED)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Select the following menu items: Powertrain / Engine and ECT / Data List / All Data / Vehicle Speed.
(e) Drive the vehicle.
(f) Read the value displayed on the tester.
OK:
Vehicle speeds displayed on tester and speedometer display are equal.
OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
3. INSPECT COMBINATION METER ASSEMBLY (+S VOLTAGE)




(a) Disconnect the D1 combination meter connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage between the terminal of the combination meter and the body ground.
Standard voltage:





(d) Reconnect the combination meter connector.
NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)
OK -- Continue to next step.
4. INSPECT COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)




(a) Shift the transmission gear selector lever to the neutral position.
(b) Jack up the vehicle.
(c) Turn the ignition switch to ON.
(d) Check the voltage between the terminal of the combination meter 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 -- REPLACE COMBINATION METER ASSEMBLY
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)




(a) Disconnect the D1 combination meter connector.
(b) Disconnect the A21 ECM connector.
(c) Check the resistance.
Standard resistance (check for open):






Standard resistance (check for short):





(d) Reconnect the combination meter connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM