ES–176
2GR-FE ENGINE CONTROL SYSTEM
– SFI SYSTEM
ES
DESCRIPTION
This DTC is set when the Engine Coolant Temperature (ECT) does not reach 75
°
C (167
°
F) despite
sufficient engine warm-up time.
MONITOR DESCRIPTION
The ECM estimates the ECT based on the starting temperature, engine loads, and engine speeds. The
ECM then compares the estimated temperature with the actual ECT. When the estimated ECT reaches
75
°
C (167
°
F), the ECM checks the actual ECT. If the actual ECT is less than 75
°
C (167
°
F), the ECM
interprets this as a malfunction in the thermostat or the engine cooling system and sets the DTC.
MONITOR STRATEGY
DTC
P0128
Coolant Thermostat (Coolant Temperature
Below Thermostat Regulating Temperature)
DTC No.
DTC Detection Condition
Trouble Area
P0128
Conditions (a), (b) and (c) are met for 5 seconds (2 rip
detection logic):
(a) Cold start
(b) Engine warmed up
(c) ECT less than 75
°
C (167
°
F)
•
Thermostat
•
Cooling system
•
ECT sensor
•
ECM
Related DTCs
P0128: Coolant Thermostat
Required Sensors/Components (Main)
Thermostat
Required Sensors/Components (Sub)
Engine Coolant Temperature (ECT) sensor, Intake Air Temperature (IAT)
sensor, Vehicle speed sensor
Frequency of Operation
Once per driving cycle
Indicated Coolant Temperature Reading
DTC Set (after 2 Driving Cycles)
Estimated ECT
5 seconds
Threshold (75°C
(167°F))
ECT
Time
A082385E20
Summary of Contents for 2GR-FE
Page 176: ...ES 20 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES NEXT 20 CONDUCT CONFIRMATION TEST END ...
Page 247: ...2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES 91 ES OK REPLACE ECM See page ES 518 ...
Page 412: ...ES 256 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES A END ...
Page 447: ...2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES 291 ES OK REPLACE ECM See page ES 518 ...
Page 556: ...ES 400 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES A REPLACE TCM ...
Page 630: ...ES 474 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES OK REPLACE ECM See page ES 518 ...
Page 658: ...2GR FE ENGINE CONTROL SYSTEM VVT SENSOR ES 493 ES 22 INSTALL ENGINE UNDER COVER LH ...
Page 897: ...2GR FE STARTING SMART KEY SYSTEM ST 35 ST OK REPLACE MAIN BODY ECU ...
Page 923: ...2GR FE STARTING SMART KEY SYSTEM ST 61 ST OK REPLACE MAIN BODY ECU ...
Page 935: ...2GR FE STARTING SMART KEY SYSTEM ST 73 ST OK REPLACE MAIN BODY ECU ...
Page 940: ...ST 78 2GR FE STARTING SMART KEY SYSTEM ST OK REPLACE MAIN BODY ECU ...
Page 958: ...ST 96 2GR FE STARTING SMART KEY SYSTEM ST OK END MAIN BODY ECU DEFECTIVE ...