Inspection Procedure

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

Is DTC output?
Check DTC. See b Or c .
1. YES: Repair circuit indicated by the code output.
2. NO: Go to next step.
Check that the ECU connectors are securely connected to the ECU.
1. NO: Connect the connector to the ECU.
2. YES: Go to next step.
Check voltage between terminals IG1 and GND of ABS actuator connector.
Preparation:

Disconnect ABS actuator connector.

CHECK:
1. Turn the ignition switch ON.
2. Measure voltage between terminals IG1 (3) - GND (1, 23) of ABS actuator harness side connector.
  
  Fig 1: Locating ABS ECU Terminals 1, 2, & 23
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK:

Voltage: 10 - 14 V .
1. NG: Check for open and short circuit in harness and connector between ECU-IG fuse and ABS actuator. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
2. OK: Go to next step.
Check battery positive voltage.
OK:

Voltage: 10 - 14 V .
1. NG: Check and repair the charging system. See CHARGING .
2. OK: Go to next step.
Check the Tc terminal circuit.
1. NG: Repair or replace the Tc terminal circuit.
2. OK: Go to next step.
Check operation of the ABS warning light.
CHECK:
1. Using service wire, connect terminal WA (30) and GND1 (1) of ABS actuator connector.
2. Turn the ignition switch ON.
  
  Fig 2: Locating ABS ECU Terminals 1, & 30
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK:

ABS warning light goes off
1. OK: Check and replace ABS actuator assembly.
2. NG: Go to next step.
Check for open circuit in harness and connector between combination meter and ABS actuator. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. OK: Repair or replace combination meter assembly.
2. NG: Go to next step.
Repair or replace harness or connector.