Inspection Procedure

INSPECT COMBINATION METER (OUTPUT WAVEFORM)

Check the output waveform.

Remove the combination meter assembly with the connector still connected.
Connect an oscilloscope to terminal E55-36 (+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.

WAVEFORM SIGNAL REFERENCE

Item	Condition
Tool setting	5V/DIV., 20ms./DIV.
Vehicle condition	Driving at approx. 20 km/h (12 mph)

Fig 1: Identifying Terminal Of E55 Combination Meter Connector With Waveform Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 METER / GAUGE SYSTEM )

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER)

Disconnect the navigation receiver assembly connector and combination meter connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Condition	Specified Condition
E52-3 (SPD) - E55-36 (+S)	Always	Below 1 Ω

Fig 2: Identifying E52 Navigation Receiver Assembly And E55 Combination Meter Connectors

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE NAVIGATION RECEIVER ASSEMBLY (See REMOVAL )