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 continuity between terminals WRR and PGND, WRL and PGND of EMPS ECU connector .
PREPARATION: Remove the EMPS ECU with connectors still connected.

CHECK: Turn the ignition switch ON and measure the resistance between terminals WRR and PGND, WRL and PGND of EMPS ECU connector.

Fig 1: Locating EMPS ECU Terminals WRR, PGND & WRL
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Resistance: 1 M/Ohm or higher
1. NG: Check and replace the EMPS ECU. 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 terminals WRR of EMPS ECU connector and RRO of brake ECU connector, WRL of EMPS ECU and RLO of brake ECU connector . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. NG: Repair and replace harness or connector.
2. OK: Go to 3.
Check the DTC for the ABS with EBD and RBS .
Output NG code: Repair ABS with EBD and RBS control system according to the code output.