Toyota RM787U, Руководство по обслуживанию и ремонту

Страница: 569 / 1976

FI6448
Engine Coolant Temp. Sensor
ECM
5V
THW
E2
E1
2
1
G-B
BR
E11
14
18
E11
W
- DIAGNOSTICS ENGINE
DI-31
185
Author: Date:
2001 SIENNA (RM787U)
DTC P0115 Engine Coolant Temp. Circuit Malfunction
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-27 .
If the ECM detects the DTC P0115, it operates fail-safe function in which the engine coolant temperature
is assumed to be 80
° C (176 °F).
DTC No. Detection Item Trouble Area
P0115 Open or short in engine coolant temp. sensor circuit
Open or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
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.
Temperature Displayed Malfunction
-40 ° C (-40 ° F) Open circuit
140 °C (284 °F) or more Short circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs P0110, P0115 and P0120 are output simultaneously, E2 (Sensor Ground) may be open.
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. 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.
DI21V-03