Inspection Procedure

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

Check ECU-IG No. 2 fuse.
Preparation: Remove the ECU-IG No. 2 fuse from the driver side J/B.

Fig 1: Locating ECU-IG No. 2 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check: Continuity of the ECU-IG No. 2 fuse.

OK: Continuity.

NG: Check for short circuit in all the harness and components connected to ECU-IG No. 2 fuse. See Figure.

If OK , go to step 2.
Check battery positive voltage.
OK: Voltage: 10-14 V.

If NG , check and repair the charging system. See CHARGING SYSTEM .

If OK , go to step 3.
Check voltage between terminals IG1 (1) and GND (28, 29) of ABS & BA & TRAC & VSC ECU.
Preparation: Disconnect the connector from the ABS & BA & TRAC & VSC ECU.

Check:
1. Turn the ignition switch ON.
2. Measure the voltage between terminals 1 and 28, 29 of ABS & BA & TRAC & VSC ECU harness side connector.
  
  Fig 2: Testing Voltages Of Terminals 1, 28 & 29 Of ABS & BA & TRAC & VSC ECU
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Voltage: 10-14 V.

OK: Check and replace ABS & BA & TRAC & VSC ECU.

If NG , go to step 4.
Check continuity between terminals GND (28, 29) of ABS & BA & TRAC & VSC ECU and body ground.

Check: Measure the resistance between terminal 28, 29 of ABS & BA & TRAC & VSC ECU harness side connector and body ground.

Fig 3: Testing Resistance Values Of Terminals 1, 28 & 29 Of ABS & BA & TRAC & VSC ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Resistance: One ohm or less.

NG: Repair or replace harness or connector.

OK: Check for open circuit in harness and connector between ABS & BA & TRAC & VSC ECU and ECU-IG fuse. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .