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To prepare for testing, turn ignition switch to the "OFF" position. Disconnect ECU connector. Connect ABS Tester (Fast Check) to ECU harness connector. Ensure all tester switches are off. Turn ignition on. Ensure "POWER" LED is illuminated on tester. See Fig 1 . If "POWER" LED is illuminated, go to TEST A in this article. If "POWER" LED is not illuminated, check underhood fuse "Q" (15-amp), check battery condition, check overvoltage protection relay located next to ECU, check for an open between pin No. 30 (Purple/Brown wire) of overvoltage protection relay harness connector and pin No. 1 of tester. Repair as necessary. Go to TEST A in this article. To reduce diagnostic time, test components in order given.