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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the ETCS fuse from the engine room junction block. See Fig 1. Check the continuity of the ETCS fuse. If okay, go to next step. If not okay, check for short in all harness and components connected to ETCS fuse.
  2. Remove the engine room ECU cover. Measure the voltage between terminal +BM of the ECM connector and body ground. See Fig 2. If voltage is 9-14 volts, check and replace ECM. If voltage is not 9-14 volts, check and repair harness or connector between battery and ETCS fuse, and ETCS fuse and ECM.
Fig 1: Locating ETCS Fuse
G00165166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Checking Voltage Between ECM Terminal +BM & Ground
G00165167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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