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 WL of EMPS ECU connector and body ground .
PREPARATION: Remove the EMPS ECU with connectors still connected.

CHECK: Turn the ignition switch ON and measure the voltage between terminals WL of EMPS ECU connector and body ground.

Fig 1: Locating EMPS ECU Terminal WL
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Voltage: 9 - 14 V
1. NG: Check and replace EMPS ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
2. OK: Go to 2.
Check for open and short circuit in harness and connector between EMPS ECU and multi-information display . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. NG: Repair or replace harness or connector.
2. OK: Check multi-information display circuit. See STEP 1 - DIAGNOSIS SYSTEM MODE (W/O NAVIGATION) Or STEP 2 - DIAGNOSIS SYSTEM MODE (W/NAVIGATION) .