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 (OUTPUT WAVEFORM)

Check the output waveform.
1. Remove the combination meter with the connector still connected.
2. Connect an oscilloscope to terminal E46-36 (+S) and body ground.
3. Turn the ignition switch to ON.
4. Turn a drive wheel slowly.
5. Check the signal waveform according to the condition(s) in the table below.

ITEM CONDITION 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 )

Fig 1: Identifying Combination Meter Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
E106-3 (SPD) - E46-36 (+S)	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying Navigation Receiver Assembly Connector And Combination Meter Connector

OK: REPLACE NAVIGATION RECEIVER ASSEMBLY (See REMOVAL )