Toyota 2GR-FE Manual page 334

ES–178
Result
A
ES
2
CHECK COOLING SYSTEM
OK
3
INSPECT THERMOSTAT
OK
REPLACE ECM (See page ES-518)
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Display (DTC Output)
P0128
P0128 and other DTCs
(d) Enter the following menus: DIAGNOSIS / ENHANCED II
/ DTC INFO / CURRENT CODES.
(e) Read the DTC.
HINT:
If any DTC other than P0128 are output, troubleshoot
those DTCs first.
B
GO TO DTC CHART (See page ES-63)
(a) Check for defects in the cooling system that might cause
the system to be too cold, such as abnormal radiator fan
operation or any modifications.
NG
REPAIR OR REPLACE COOLING SYSTEM
(a) Remove the thermostat (See page CO-13).
(b) Check the valve opening temperature of the thermostat.
Standard:
80 to 84°C (176 to 183°F)
HINT:
In addition to the above check, confirm that the valve is
completely closed when the temperature is below the
standard.
(c) Reinstall the thermostat (See page CO-14).
NG
REPLACE THERMOSTAT (See page CO-13)
Proceed to
A
B