Inspection Procedure
WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)
- Check the output waveform.
- Remove the combination meter assembly with the connector still connected.
- Connect an oscilloscope to terminals E46-36 (+S) and body ground.
- Turn the ignition switch to ON.
- Turn the wheel slowly.
- Check the signal waveform according to the condition(s) in the table below.SIGNAL WAVEFORM CONDITION REFERENCE CHART
Item Condition Tool setting 5 V/DIV., 20 ms./DIV. Vehicle condition Driving at approx. 20 km/h (12 mph) OK: The waveform is displayed as shown in the illustration.
HINT:
When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
NG: GO TO METER / GAUGE SYSTEM (See SPEED SIGNAL CIRCUIT )
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to Next Step
- Check the output waveform.
- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER ASSEMBLY)
- Disconnect the radio receiver connector and the combination meter assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
RESISTANCE SPECIFICATIONTester Connection Condition Specified Condition E26-3 (SPD) - E46-36 (+S) Always Below 1 Ω NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE RADIO RECEIVER (See REMOVAL )