Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

Check combination meter ECU.
CHECK:

Start the engine and check that the speed meter and tachometer operate normally.

HINT:

With this inspection, whether or not the combination meter ECU CPU functions normally can be diagnosed.
1. NG : Replace combination meter ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Go to next step.

Check wire harness.

PREPARATION:

Pull out the ECU connectors mentioned below.

DTC DETECTION ITEM

Wire harness side connector of ECU	Terminal
Combination meter - Gateway ECU	MPX+ (C12-2) - MPXI2 (G3-16)
Combination meter-Skid control ECU	MPX- (C12-3) - MPX1 (S12-8)

CHECK:

Check continuity of the wire harness between the connectors.

Fig 1: Checking Continuity Of Wire Harness Between Connectors

OK:

There is a continuity between the connectors.

HINT:

If there is OPEN in any wire harness, please repair it.

NG : Repair or replace wire harness.
OK : Replace combination meter ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).