Toyota Tundra (2015 year). Manual — part 1525
OK
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
.
NG
REPLACE THERMOSTAT
3.
CHECK COOLING SYSTEM
(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
OK
REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insuff...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000TB30BYX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Coolant Thermostat (Coolant Temperature
Below Thermostat Regulating Temperature); 2015 MY Tundra [08/2014 - ]
DTC
P0128
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating
Temperature)
CAUTION / NOTICE / HINT
DESCRIPTION
This DTC is stored when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient
engine warm-up time having elapsed.
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0128
Conditions (a), (b) and (c) met for 5 seconds (2 trip
detection logic):
(a) Cold start
(b) Engine warmed up
(c) ECT less than 75°C (167°F)
Thermostat
Cooling system
Engine coolant temperature
sensor
ECM
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
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Coola...
(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
Related DTCs
P0128: Coolant Thermostat
Required Sensors/Components
(Main)
Thermostat
Required Sensors/Components
(Related)
Engine Coolant Temperature (ECT) sensor, Intake Air Temperature (IAT)
sensor, Vehicle speed sensor
Duration
900 seconds
MIL Operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following
DTCs not stored
P0010, P0020 (Camshaft Timing Oil Control Valve)
P0011, P0021 (VVT System - Advance)
P0012, P0022 (VVT System - Retard)
P0016, P0018 (VVT System - Misalignment)
P0013, P0023 (Exhaust Camshaft Timing Oil Control Valve)
P0014, P0024 (Exhaust VVT System - Advance)
P0015, P0025 (Exhaust VVT System - Retard)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0031, P0032, P0051, P0052, P101D, P103D (Air Fuel Ratio Sensor
Heater)
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, P2195,
P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241, P2242,
P2252, P2253, P2255, P2256 (Air Fuel Ratio Sensor)
P0102, P0103 (Mass Air Flow Meter)
P0112, P0113 (Intake Air Temperature Sensor)
P0115, P0117, P0118 (Engine Coolant Temperature Sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle
Position Sensor)
P0171, P0172, P0174, P0175 (Fuel System)
P0301 - P0308 (Misfire)
P0335 (Crankshaft Position Sensor)
P1340 (Camshaft Position Sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT Sensor)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT Sensor)
P0351 - P0358 (Igniter)
P0500 (Vehicle Speed Sensor)
Battery voltage
11 V or more
-
ECT at engine start -
IAT at engine start
-15 to 7°C (-27 to 12.6°F)
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Coola...
TYPICAL MALFUNCTION THRESHOLDS
(a) Estimated ECT
75°C (167°F) or more
(b) ECT sensor output
Below 75°C (167°F)
CONFIRMATION DRIVING PATTERN
Stop the engine and allow it to soak.
1.
Connect the Techstream to the DLC3.
2.
Turn the ignition switch to ON and turn the Techstream on [A].
3.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp and
Intake Air.
4.
Check that "Coolant Temp" is 56°C (133°F) or less and "Intake Air" is between 0 and 35°C (0 and
95°F).
5.
Set the heater to MAX HOT with fresh air mode selected and turn the A/C off.
6.
Start the engine and drive the vehicle at 80 km/h (50 mph) for 15 minutes [B].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
Data can be captured relatively easily by using the snapshot function in the Data List.
Enter the following menus: Data List / Function / Snap-shot configuration / Record time / 5
min.
Data capture can be started by using the target point function. For example, setting the
After "Coolant Temp" stabilizes, check that "Coolant Temp" is 75°C (167°F) or higher [C].
HINT:
IF "Coolant Temp" is below 75°C (167°F) while driving the vehicle at 80 km/h (50 mph),
inspect the cooling system and thermostat.
8.
INSPECTION PROCEDURE
HINT:
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Coola...
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