Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - TRANSLATE ECU)

Disconnect the A42 and T29 ECU connectors.
Measure the resistance of the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
A42-14 (ENG+) - T29-14 (ENG+)	Below 1 Ω
A42-16 (TRC-) - T29-17 (TRC-)	Below 1 Ω
A42-22 (ENG-) - T29-15 (ENG-)	Below 1 Ω
A42-24 (TRC+) - T29-16 (TRC+)	Below 1 Ω

Fig 1: ECM Communication Circuit Diagram

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO Next Step

CHECK ECU COMMUNICATION (SKID CONTROL ECU - TRANSLATE ECU)
1. Remove the skid control ECU.
2. Connect an oscilloscope to terminals ENG+ and ENG- or TRC+ and TRC- of skid control ECU.
3. Start the engine, and check the signal waveform.
OK: A waveform is output, as shown in the illustration.

NG: REPLACE SKID CONTROL ECU

Fig 2: Identifying Skid Control ECU Assembly Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE TRANSLATE ECU