Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Check voltage between terminals Tc and CG of DLC3 .
CHECK: Turn the ignition switch ON and measure the voltage between terminals Tc and CG of the DLC3.

Fig 1: Locating DLC3 Terminals Tc & CG
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Voltage: 9 - 14 V
1. OK: If PS warning light does not blink even after Tc and CG are connected, EMPS ECU may be defective.
2. NG: Go to 2.
Turn the ignition switch OFF, and check for open and short circuit in harness and connector between EMPS ECU and DLC3, and DLC3 and body ground . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. NG: Repair or replace harness or connector.
2. OK: Check and replace EMPS ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .