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VEHICLE SPEED SIGNAL CIRCUIT STC-15 < COMPONENT DIAGNOSIS > [WITHOUT 4WAS] C D E F H I J K L M A B STC N O P VEHICLE SPEED SIGNAL CIRCUIT Description INFOID:0000000001666278 • Unified meter and A/C amp. sends vehicle speed signal to power steering control unit. Diagnosis Procedure INFOID:0000000001666279 1. PERFORM UNIFIED METER AND A/C AMP. SELF-DIAGNOSIS With CONSULT-III Perform unified meter and A/C amp. self-diagnosis. Is any error system detected? YES >> Check the error system. NO >> GO TO 2. 2. CHECK HARNESS BETWEEN UNIFIED METER AND A/C AMP. AND POWER STEERING CONTROL UNIT 1. Turn the ignition switch OFF. 2. Disconnect unified meter and A/C amp. harness connector. 3. Disconnect power steering control unit harness connector. 4. Check continuity between unified meter and A/C amp. harness connector and power steering control unit Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace damaged parts. 3. CHECK VEHICLE SPEED SIGNAL (1) 1. Turn the ignition switch OFF. 2. Connect unified meter and A/C amp. harness connector. 3. Check unified meter and A/C amp. input/output standard values. Refer to Is the inspection result normal? YES >> GO TO 4. NO >> Replace unified meter and A/C amp. Refer to 4. CHECK VEHICLE SPEED SIGNAL (2) 1. Turn the ignition switch OFF. 2. Connect power steering control unit harness connector. 3. Check signal between power steering control unit harness connector and ground with oscilloscope. Also check harness for short to ground and short to power. Unified meter and A/C amp. Power steering control unit Continuity Connector Terminal Connector Terminal M66 8 M108 8 Existed Power steering control unit Value (Approx.) Connector Terminal Condition M108 8 – Ground Vehicle speed: CAUTION: Check air pressure of tire under SEIA0775E |