Toyota T100 1996 Service Manual page 422

DI−158
DTC P0115
CIRCUIT DESCRIPTION
A thermistor built into the engine coolant temp. sensor changes the resistance value according to the engine
coolant temp.
The structure of the sensor and connection to the ECM is the same as in the intake air temp. circuit malfunc-
tion shown on page DI−154.
If the ECM detects the DTC P0115, it operates the fail safe function in which the engine coolant temp. is
assumed to be 80°C (176°F).
DTC No.
P0115 Open or short in engine coolant temp. sensor circuit
HINT:
After confirming DTC P0115 use the OBD II scan tool or TOYOTA hand−held tester to confirm the engine
coolant temp. from "CURRENT DATA".
140°C (284°F) or more
WIRING DIAGRAM
Engine Coolant Temp. Sensor
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
Engine Coolant Temp. Circuit Malfunction
Detection Item
Temp. Displayed
− 40°C (− 40°F)
2
G−Y
1
BR−B
− ENGINE (5VZ−FE)
S Open or short in engine coolant temp. sensor circuit
S Engine coolant temp. sensor
S ECM
2
G−Y
EC2
1
BR−B
EC2
(M/T)(A/T)
Trouble Area
Malfunction
Open circuit
Short circuit
ECM
5 V
20
4
THW
E6 E6
9 22
E2
E6 E6
E1
DI0UJ−01
P19947