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Home >> Toyota >> 2003 >> Prius >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self Diagnostics >> Diagnostic Tests >> DTC P1129: Electronic Throttle Control System Malfunction >> Diagnosis & Repair

Diagnosis & Repair

NOTE: Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.

Replace ECM. ECM is located behind glove box. See Figure. Using Toyota hand-held tester or scan tool, clear DTCs from ECM. Recheck for DTCs. If DTC P1129 still exists, replace throttle body. For removal and installation of components, see REMOVAL & INSTALLATION - 4-CYLINDER article.

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