Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Check battery positive voltage.
OK:

Voltage: 10 to 14 V
1. NG: Check and repair the charging system.
2. OK: Go to next step.
Check voltage of the ECU IG power source.
In case of using the hand-held tester:

PREPARATION:
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main switch ON.
3. Select the DATALIST mode on the hand-held tester.
  CHECK:
  
  Check the voltage condition output from the ECU displayed on the hand-held tester.
  
  OK:
  
  "Normal" is displayed.
  
  In case of not using the hand-held tester:
  
  PREPARATION:
  
  Remove the skid control ECU with connectors still connected.
  
  CHECK:
1. Turn the ignition switch ON.
2. Measure voltage between terminals IG1 and GND of the skid control ECU connector.
  OK:
  
  Voltage: 10 to 14 V
  
  Fig 1: Measuring Voltage Between Terminals IG1 & GND Of Skid Control ECU Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Turn ignition switch OFF, check and replace skid control ECU.
2. NG: Go to next step.
Check continuity between terminal GND of skid control ECU connector and body ground.
CHECK:

Measure resistance between terminal GND of the skid control ECU connector and body ground.

OK:

Resistance: 1 Ω or less

Fig 2: Measuring Resistance Between Terminal GND Of Skid Control ECU Connector & Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
Check ECU-IG fuse.
PREPARATION:

Remove the ECU-IG fuse from the driver side J/B.

CHECK:

Check continuity of the ECU-IG fuse.

OK:

Continuity

Fig 3: Identifying ECU-IG Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check for short circuit in all the harness and components connected to ECU-IG fuse (See attached wiring diagram).
2. OK: Check for open circuit in harness and connector between skid control ECU and battery (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).