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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Toyota ECHO, 2002 Toyota Celica, 2001 Toyota ECHO, and 2001 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access the ECM, located in engine compartment, near battery on Celica, and behind glove compartment on ECHO. See Figure and Figure . Disconnect appropriate ECM connector for terminals NT+ and NT-. See WIRING DIAGRAMS . Using a DVOM, measure resistance between ECM connector terminals NT+ and NT-. Resistance should be 560-680 ohms. If resistance is as specified, replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If resistance is not as specified, go to next step.
  2. Remove input turbine speed sensor from transaxle. See Figure and Figure . Measure resistance between speed sensor terminals. Resistance should be 560-680 ohms. Replace speed sensor as necessary. If resistance is okay, go to next step.
  3. Connect a DVOM to speed sensor terminals. Measure voltage when a magnet is put close to tip of speed sensor, then taken away quickly. See Figure. Voltage generated should be intermittent and extremely low. If resistance and voltage are not as specified, replace speed sensor. If resistance and voltage are as specified, check and repair wiring harness or connector between speed sensor and ECM.
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