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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the voltage in the battery. If voltage is between 10-14 volts, go to next step. If battery is below specified voltage, charge or replace the battery.
  2. Disconnect the ECM connector. Measure the voltage between terminals NSW and E1 when the ignition key is turned to each position. See PIN VOLTAGE TESTS . At the START position reading should be 10-14 volts. All other positions should read zero volts. If reading is within specification, replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If not within specification, repair or replace transaxle wiring harness and connector.
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