Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Even though terminal TC is not connected with terminal CG, the MIL blinks.
For the above phenomenon, an open or short in the wire harness, or a malfunction inside the ECM is a likely cause.

Check voltage between terminals TC and CG of DLC3.
PREPARATION:

Turn the ignition switch ON.

CHECK:

Measure the voltage between terminals TC and CG of the DLC3.

Fig 1: Measuring Voltage Between Terminals TC & CG Of DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Voltage: 9-14 V
1. OK: Check and replace ECM (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. NG: Go to next step.
Check continuity between CG of DLC3 and body ground.
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
Check for open and short circuit in harness and connector between ECM and DLC3, and DLC3 and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG: Repair or harness or connector.
2. OK: Check and replace ECM (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).