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 205 (ENGINE IMMOBILIZER)DESCRIPTION & OPERATIONSYSTEM OUTLINEINPUT SIGNALS
2004 Toyota Matrix XR, FWD, Standard
Input Signals
2004 Toyota Matrix XR, FWD, StandardSECTION Input Signals
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.
- Engine Coolant Temperature Signal Circuit - The engine coolant temperature sensor detects the engine coolant temperature and has a built-in thermistor with a resistance, which varies according to the engine coolant temperature. The engine coolant temperature which is input into terminal No. E8-14 (THW) of the engine control module as a control signal.
- Intake Air Temperature Signal Circuit - The intake air temperature sensor is installed in the mass air flow meter and detects the intake air temperature which is input as a control signal to terminal No. E8-22 (THA) of the engine control module.
- Vehicle Speed Signal Circuit - The vehicle speed signal is input from the ABS speed sensor to ABS & BA & TRAC & VSC ECU, and are sent to the engine control module through communication control.
- RPM Signal Circuit - Camshaft position is detected by the VVT sensors and it's signal is input to terminals No. E9-10 (VV1+) and E9-22 (VV2+) of the engine control module as a control signal. Also, engine RPM is detected by the crankshaft position sensor and is input as a control signal to terminal No. E8-16 (NE+).
- Throttle Position Signal Circuit - The throttle position sensor detects the throttle valve opening angle as a control signal, which is input into terminal No. E8-23 (VTA1) of the engine control module.
- Battery Signal Circuit - Voltage is constantly applied to terminal No. E5-1 (BATT) of the engine control module. With the ignition switch turned on, the voltage for engine control module start-up power supply is applied to terminal No. E5-16 (+B) of the engine control module via the EFI relay. The current flowing through the IGN fuse flows to terminal No. E5-2 (IGSW) of the engine control module.
- Intake Air Volume Signal Circuit - Intake air volume is detected by the mass air flow meter and the signal is input to terminal No. E8-10 (VG) of the engine control module as a control signal.
- Stop Light Switch Signal Circuit - The stop light switch is used to detect whether the vehicle is braking or not and the signal is input into terminal No. E5-15 (STP) of the engine control module as a control signal.
- Starter Signal Circuit - To confirm whether the engine is cranking, voltage is applied to the started motor. If cranking is detected, the signal is input into terminal No. E5-7 (STA) of the engine control module as a control signal.
- Engine Knock Signal Circuit - Engine knocking is detected by knock sensors and the signal is input into terminals No. E9-28 (KNKL) and E9-27 (KNKR) as a control signal.
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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.