Diag. Code 22 Water Temp. Sensor Signal
CIRCUIT DESCRIPTION
The water temperature sensor senses the coolant temperature. The resistance value of a thermistor
built in the sensor changes according to the coolant temperature. The lower the coolant temperature,
the larger the resistance value becomes.
If diagnostic code 22 is recorded in memory, the fail safe function operates and fixes the coolant tem-
perature at a constant 80°C (176°F).
Code No. Diagnosis Trouble Area
22
Open or short in water temp. sensor circuit for
0.5 sec. or more (THW).
• Open or short in water temp.
sensor circuit.
• Water temp. sensor
• ECU
DIAGNOSTIC CHART
Check water temp. sensor.
Check voltage between terminals
THW and E2 of ECU connector.
Check harness and connector between
ECU and water temp. sensor.
Replace ECU.
Replace water temp. sensor.
Replace ECU. *
Repair or replace harness or
connector.
* When diag. code 22 is not displayed, proceed
to next circuit inspection shown on matrix
chart (See page TR–23).
WIRING DIAGRAM AND ECU CONNECTORS
TR–40
–ENGINE TROUBLESHOOTING Circuiit Inspection
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