Component Tests and General Diagnostics

METER: METER / GAUGE SYSTEM: ON-VEHICLE INSPECTION

1. INSPECT SPEEDOMETER

(a) Check speedometer operation.

NOTICE:
* The meter ECU receives the vehicle speed signal from the skid control ECU via CAN communication. Therefore, perform the following inspection referring to values on the Data List of the skid control ECU because it is the source of the vehicle speed signal.
* The Data List values of the skid control ECU are used for this inspection. Therefore, make sure to perform the inspection after confirming that no DTCs are output from the brake control system.
* If the tire size or tire inflation pressure is not within the specified range, or the tires are excessively worn, the speedometer indication error will increase. Therefore, make sure to perform the inspection after checking that the tire size, tire inflation pressure and tire wear are in the specified range.

(1) Before starting the following inspection, check if the Brake Control System outputs the DTCs.

(2) Check the values by referring to the table below.

ABS/VSC/TRAC





Reference (Indicator Type: mph)





Reference (Indicator Type: km/h)





2. INSPECT OUTPUT SIGNAL OF VEHICLE SPEED SENSOR

(a) Check the output waveform.





(1) Remove the combination meter assembly with the connector(s) still connected.

(2) Connect an oscilloscope to terminal C37-20 (+S) and body ground.

(3) Start the engine.

(4) Turn the wheel slowly.

(5) Check the signal waveform according to the condition(s) in the table below.





OK:

The waveform is displayed as shown in the illustration.

HINT
As the vehicle speed increases, the cycle of the waveform narrows.

Text in Illustration





3. INSPECT TACHOMETER

(a) Check tachometer operation.

(1) Connect the Techstream, and start the engine.

(2) Compare the test results with the tachometer indications.

DC 13.5 V, at 25°C (77°F)





4. INSPECT OIL PRESSURE WARNING LIGHT

(a) Disconnect the B6 engine oil pressure switch connector.

(b) Turn the ignition switch to ON.

(c) Ground the terminal of the wire harness side connector, then check the engine oil pressure warning light.

OK:

Engine oil pressure warning light illuminates.