Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 206 (CRUISE CONTROL)DIAGNOSTIC TESTSDTC 21: OPEN IN VEHICLE SPEED SENSOR CIRCUITDIAGNOSTIC PROCEDURE
2004 Toyota Matrix XR, FWD, Standard
Diagnostic Procedure
2004 Toyota Matrix XR, FWD, StandardSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
- Check the input signal. See INPUT SIGNAL CHECK under SELF-DIAGNOSTIC SYSTEM. Check the indicator light operation when driving with vehicle speed above 25 mph (40 km/h), and with speed below 25 mph (40 km/h). The results are OK if when the vehicle speed is above 25 mph (40 km/h), the indicator light blinks and when the vehicle speed is below 25 mph (40 km/h), the indicator light stays on. If the results are OK, check and replace the cruise control ECU. See CRUISE CONTROL ECU under REMOVAL & INSTALLATION. If the results are not OK, go to the next step.
- Check the speedometer circuit. See appropriate INSTRUMENT PANEL article. If the results are OK, go to the next step. If the results are not OK, repair or replace the wiring harness, connector or combination meter assembly.
- Check the wiring harness and connector between the cruise control ECU and combination meter, combination meter and vehicle speed sensor. If the results are OK, go to the next step. If the results are not OK, repair or replace the wiring harness or connector.
- Check the vehicle speed sensor. See COMBINATION METER CIRCUIT PLATE under CIRCUIT TESTS in appropriate INSTRUMENT PANEL article. If the results are OK, check and replace the cruise control ECU. See CRUISE CONTROL ECU under REMOVAL & INSTALLATION. If the results are not OK, replace the vehicle speed sensor. See VEHICLE SPEED SENSOR under ENGINE SENSORS & SWITCHES under appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.