Throttle Position Sensor: Testing and Inspection

Throttle Sensor Schematic:

A faulty throttle position sensor will set code 31 in the on-board diagnostic system. Integral with the throttle sensor is the idle switch, which will set code 42 when defective. Refer to the schematic diagram and test the sensor and switch with the diagnostic charts.

Wire color code identification:

L: Blue
B: Black
Y: Yellow
G: Green
R: Red
W: White
Br: Brown
Lg: Light green
Gr: Gray

Throttle Sensor Diagnostic Chart:

THROTTLE SENSOR DIAGNOSTIC CHART

Idle Switch Diagnostic Chart:

IDLE SWITCH DIAGNOSTIC CHART