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Home >> Toyota >> 2003 >> Matrix Base, FWD, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Cruise Control Systems - 2ZZ-GE) >> Diagnostic trouble codes >> DTC 51 Idle Signal Circuit >> Circuit Description
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Circuit Description

WARNING: This page is about a different variant/trim than selected.

When the idle switch is turned ON, a signal is sent to the cruise control ECU assy. The cruise control ECU assy uses this signal to correct the discrepancy between the throttle valve position and the actuator position sensor values to enable accurate cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the engine, so also inspect the engine.

DTC 51

DTC DTC Detecting Condition Trouble Area
51 Short in idle signal circuit.
..... ..... Throttle position sensor
..... ..... Idle signal circuit
..... ..... ECM
..... ..... Cruise control ECU assy