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Home >> Toyota >> 2000 >> RAV4 Base, AWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Control System Self-Diagnostics) >> Diagnostic Tests >> DTC P1633: ECM Malfunction (Electronic Throttle Control System Circuit) >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2000 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Throttle valve opening angle is detected by Throttle Position (TP) sensor and sends a signal to ECM. ECM then uses this signal to control throttle control motor which opens and closes throttle valve in response to driving conditions. Possible cause is: