-
DIAGNOSTICS
ENGINE
DI-47
201
Author:
Date:
2001 SIENNA (RM787U)
DTC
P0128
Thermostat Malfunction
CIRCUIT DESCRIPTION
If the water temperature becomes 75
°
C (167
°
F) or more, it is abnormal.
If not due to the thermostat malfunction, it is abnormal.
DTC No.
DTC Detecting Condition
Trouble Area
P0128
Condition (a), (b) or (c):
(a) After starting engine at 20
°
C (68
°
F)
(b) After engine is warmed up
(c) THW < 75
°
C (167
°
F)
Thermostat
Cooling system
Engine coolant temp. sensor
ECM
INSPECTION PROCEDURE
HINT:
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 was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
1
Check thermostat (See page
NG
Replace thermostat.
YES
2
Are there any other codes (besides DTC P0128) being output?
YES
Go to relevant DTC chart
(See page
NG
Check and replace ECM (See page
).
DI6T2-01
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