Inspection Procedure

Check ECU-IG fuse .
Remove the ECU-IG fuse from the driver side J/B No. 1.

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

Check continuity of the ECU-IG fuse.

OK: Continuity
1. OK: Go to next step .
2. NG: Check for short circuit in all the harness and components connected to ECU-IG fuse (See Figure ) .
Check battery positive voltage .
OK: Voltage: 10 - 14 V .
1. OK: Go to next step .
2. NG: Check and repair the charging system. See CHARGING .
Check voltage between terminals IG1 (56) and GND (29, 83) of Skid Control ECU .
Disconnect the connector from the Skid Control ECU.
1. Turn the ignition switch ON.
2. Measure the voltage between terminals 56 and 29, 83 of Skid Control ECU harness side connector.
OK: Voltage: 10 - 14 V
1. OK: Check and replace Skid Control ECU .
2. NG: Go to next step .
Check continuity between terminals GND (29, 83) of Skid Control ECU and body ground .
Measure the resistance between terminal 29, 83 of Skid Control ECU harness side connector and body ground.

Fig 3: Testing Resistance Between Terminals 29, 83 & Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Resistance: 1 Ohm or less
1. OK: Go to next step .
2. NG: Repair or replace harness or connector .
Check for open circuit in harness and connector between Skid Control ECU and ECU-IG fuse. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE