Inspection Procedure

Check ECU-IG fuse.
PREPARATION:

Remove the ECU-IG fuse from the Instrument Panel J/B.

Fig 1: Identifying ECU-IG Fuse In Instrument Panel J/B
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK: Check the continuity of the ECU-IG fuse.

OK: Continuity
1. NG: Check for short circuit in all harness and components connected to ECU-IG fuse (See attached wiring diagram.)
2. OK: Go To Next Step
Check battery positive voltage.
OK: Voltage: 10 - 14 V
1. NG: Check and repair charging system . See GENERATORS & REGULATORS .
2. OK: Go To Next Step
Check voltage between terminals IG1 and GND of ABS actuator connector.
PREPARATION:

Disconnect the ABS actuator connector.

CHECK:
1. Turn the ignition switch ON.
2. Measure the voltage between terminals IG1 and GND of the ABS actuator harness side connector.
  
  Fig 2: Checking Voltage At ABS Actuator Harness Side Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Voltage: 10 - 14 V
1. OK: Check and replace ABS ECU.
2. NG: Go To Next Step
Check continuity between terminals GND of ABS actuator connector and body ground.
CHECK: Measure the resistance between terminal GND of the ABS actuator harness side connector and the body ground.

Fig 3: Checking Continuity At Actuator Harness Side Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:
1. Resistance: 1 ohm or less
1. NG: Repair or replace harness or connector.
2. OK: Check for open circuit in harness and connector between terminals IG1 of ABS & TRAC ECU and ECU-IG fuse . See SYSTEM WIRING DIAGRAMS .