subaru Workshop Repair Guides

Subaru Workshop Service and Repair Manuals

Electrical Specifications|Page 1485 > < Electrical Specifications|Page 1483
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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection

Coolant Temperature Sensor Schematic

A faulty coolant temperature sensor will set code 21 in the on-board diagnostic system.  Refer to the schematic diagram and test the coolant sensor
with the diagnostic chart.

Wire color code identification:

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

Coolant Temperature Sensor Diagnostic Chart

COOLANT TEMPERATURE SENSOR DIAGNOSTIC CHART

Electrical Specifications|Page 1485 > < Electrical Specifications|Page 1483