Inspection Procedure

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

Check ECU-IG Fuse.
Preparation : Remove ECU-IG fuse from the instrument panel J/B. See Fig 1.

Check : Check continuity of ECU-IG fuse.

OK : Continuity.

Fig 1: Locating 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 Fig 1.
2. OK : Go to next step.
Check Battery Position Voltage.
OK : Voltage: 10-14 V.
1. NG : Check and repair the charging system.
2. OK : Go to step 3.
Check Voltage Of The ECU IG Power Source.
In case of using the TOYOTA hand-held tester:

Preparation :
1. Connect the TOYOTA hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
3. Select the DATALIST mode on the TOYOTA hand-held tester.
Check : Check the voltage condition output from the ECU displayed on the TOYOTA hand-held tester.

OK : "Normal" is displayed.

In case of using the TOYOTA hand-held tester:

Preparation: Disconnect the skid control ECU connector.

Check:
1. Turn the ignition switch ON.
2. Measure voltage between terminals IG (44) and GND (15, 46) of skid control ECU harness side connector. See Fig 2.
  OK : Voltage: 10-14 V.
  
  Fig 2: Locating Skid Control ECU Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : 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 (15, 46) of skid control ECU harness side connector and body ground. See Fig 2.

OK : Resistance: One ohm or less
1. NG Repair or replace harness or connector.
2. OK: Check for open circuit in harness and connector between skid control ECU and battery. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .