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DTC P0500: VEHICLE SPEED SENSOR (VSS) MALFUNCTION (ES 300 & HIGHLANDER) CAUTION: If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. NOTE: For circuit reference, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS . Circuit Description Anti-Lock Brake System (ABS) wheel speed sensors detect wheel speed and sends signals to ABS ECU. The ABS ECU converts signals into a 4-pulse signal and outputs signal to instrument cluster. Instrument cluster converts signal to a more precise waveform and outputs signal to ECM. ECM determines vehicle speed based on frequency of these pulse signals. DTC is set when ECM does not detect any VSS signal while vehicle is in motion. Possible causes are: Faulty wheel speed sensors. Open or short in VSS circuit. Faulty instrument cluster. Faulty ECM. l l l l Diagnosis & Repair eg

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Condition Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set. Cause The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface. Correction Measure AC voltage and clean the wheel speed sensor mounting surfaces. 1. 2. 3. 4. Raise and support the vehicle. Disconnect both the front wheel speed sensor connectors at the frame and harness. Place a Digital Volt Meter (DVM) across the terminals of each wheel speed sensor connector. Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV’s. If the reading is less than 350 ACmV’s, remove the wheel speed sensor. 5. Plug the wheel speed sensor bore in order to prevent debris from falling into the hub during service. 6. Clean the wheel speed sensor mounting surface using a wire brush, sand paper, emery cloth, scotch brite, or other suitable material. Be sure to thoroughly clean the wheel speed sensor surface. There should be no rust or corrosion. 7. Check the sensor head to determine if it has been warped/distorted due to the corrosion build up or other causes. Check the mounting surface on the sensor head for flatness by placing it on the edge of a metal machinists scale or other suitable straight edge to measure the flatness. Check the sensor for flatness in multiple (minimum 3) positions/directions. If the sensor head is distorted, replace the sensor. 8. Apply (spray) two thin coats of the specified rust penetrating lubricant (corrosion inhibitor) to the complete sensor mounting surface on the bearing hub. Allow to dry for 3-5 minutes between coats. Use ONLY Rust Penetrating Lubricant, P/N 89022217 (in Canada, P/N 89022218). 9. When the corrosion inhibitor is dry to the touch (about 10 minutes), apply a thin layer of bearing grease to the hub surface and sensor O-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344 (in Canada, P/N 993037). 10.Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual. 11.Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel. The voltage should now read at least 350 ACmV’s.

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During assembly, some wheel speed sensors may have been improperly installed and do not seal the hub assembly. Water may enter the hub assembly and damage the wheel bearing. In areas where road salt is used, the wheel bearings may corrode, which may cause the wheel to separate and fall off, increasing the risk of a crash. CORRECTIVE ACTION Inspect both rear ABS wheel speed sensors and their O-rings. If an ABS wheel speed sensor or O-ring is damaged, replace the damaged part and the hub bearing unit on that wheel. REPAIR PROCEDURE 1. 2. 3. 4. Raise the vehicle on a lift. Remove the rear wheels. Remove both rear ABS wheel speed sensors. Inspect the rear ABS wheel speed sensors and their O-rings. • If a rear ABS wheel speed sensor O-ring is damaged (cut, torn, pinched, or flattened), replace the O-ring and the corresponding rear hub bearing unit, then go to step 5. DAMAGED O-RINGS: O-ring is pinched. • If the rear ABS wheel speed sensor tip has any physical damage, remove the original sensor assembly, replace the corresponding rear hub bearing unit(s), and connect the new sensor’s wire harness. Then go to step 5. – Refer to page 18-34 (with disc brakes) or 18-36 (with drum brakes) of the 2006–07 Civic Service Manual, or – Online, enter keyword HUB, then select Rear Knuckle/Hub Bearing Unit Replacement from the list. O-ring is rolled out of the groove and flattened. -Refer to page 18-34 (with disc brakes) or 18-36 (with drum brakes) of the 2006–07 Civic Service Manual, or – Online, enter keyword HUB, then select Rear Knuckle/Hub Bearing Unit Replacement from the list. • If the rear ABS wheel speed sensors and their O-rings are OK, go to step 5. 5. Lubricate the ABS wheel speed sensor O-ring and the sensor hole in the knuckle with multi-purpose grease.

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1. Raise and support the vehicle. Refer to Vehicle Lifting. 2. Remove the tire and wheel. 3. Remove the brake rotor (2). Refer to Brake Rotor Replacement – Front. 4. Important: The wheel speed sensor mounts to the hub/bearing assembly. Thoroughly clean around this area in order to prevent any dirt or contaminants from entering the sealed wheel bearing. Failure to do this may lead to premature wheel bearing failure. Remove the Wheel Speed Sensor (WSS) mounting bolt. 5. NOTICE: Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver, or other device to pry the sensor out of the bore. Prying will cause the sensor body to break off in the bore. Remove the wheel speed sensor (5) from the hub/bearing assembly (4). Remove the WSS cable mounting clip from the knuckle. Remove the WSS cable mounting clip from the upper control arm. Remove the WSS cable mounting clip from the frame attachment point. Remove the WSS cable electrical connector. 6. 7. 8. 9. Installation Procedure 1. Plug the WSS bore to prevent debris from falling into the hub. 2. Using a wire brush or equivalent, clean the WSS mounting surface on the hub to remove any rust or corrosion. 3. Apply a thin layer of wheel bearing lubricant, GM P/N 01051344 to the hub surface and the sensor O-ring prior to the sensor installation.

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1. REMOVE BLOWER SPEED CONTROL SWITCH (a) Remove the illumination light from the A/C control assembly. (b) Using a screwdriver, pry loose the clip and push out the blower speed control switch to rear of the A/C control assembly. 2. INSPECT BLOWER SPEED CONTROL SWITCH CONTINUITY If continuity is not as specified. replace the blower speed control switch. 1991 Toyota Corolla Sedan L4-1587cc 1.6L DOHC (4A-GE) Vehicle Level Heating and Air Conditioning Blower Motor Switch Service and Repair Service and Repair BLOWER SPEED CONTROL SWITCH INSPECTION