A00328
Water Temp. Sensor
2
1
Engine ECU
G--R
LG--B
4
E5
E5
9
5V
THW
E2
E1
R
--
DIAGNOSTICS
ENGINE (2RZ--FE, 3RZ--FE)
DI--107
DTC P 0115/ 22 Water Tem p. Ci rcui t M al functi on
CIRCUIT DESCRIPTION
A thermistor built into the water temp. sensor changes the resistance value according to the water temp.
The structure of the sensor and connection to the engine ECU is the same as in the air flow meter temp.
circuit
malfunction
DTC No.
Detection Item
Trouble Area
S
Open or short in water temp. sensor circuit
P0115/22
Open or short in water temp. sensor circuit 0.5 sec or more
S
Open or short in water temp. sensor circuit
S
Water temp. sensor
P0115/22
Open or short in water temp. sensor circuit 0.5 sec or more
Water temp. sensor
S
Engine Engine ECU
HINT:
After confirming DTC P0115/22 use the hand--held tester to confirm the water temp. from CURRENT DATA.
Temp. Displayed
Malfunction
-- 40
˚
C (-- 40
˚
F)
Open circuit
140
˚C
(284
˚F) or more
Short circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
S
Read freed frame data using hand--held tester. Because freeze frame records the engine conditions
when the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle
was running or stopped, the engine warmed up or not, the air--fuel ratio lean or rich, etc. at the time
of the malfunction.
S
If DTC ”P0110/24” (Intake Air Temp. Circuit Malfunction), ”P0115/22” (Water Temp. Circuit Malfunc-
tion), ”P0120/41” (Throttle Position Sensor Circuit Malfunction) are output simultaneously, E2 (Sensor
Ground) may be open.
DI1ID--01
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3RZ-F,3RZ-FE