Toyota Tundra (2015 year). Manual — part 1901
Leave the vehicle outside overnight.
1.
Connect the Techstream to the DLC3.
2.
Turn the ignition switch to ON and turn the Techstream on.
3.
Enter the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
4.
Check that the engine coolant temperature is 0°C (32°F) or less.
5.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
6.
Turn the ignition switch off and wait for at least 30 seconds.
7.
Turn the ignition switch to ON and turn the Techstream on [A].
8.
Start the engine.
9.
After starting the engine, wait 21 minutes or more [B].
10.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
11.
Read the Pending DTCs.
HINT:
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
12.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13.
Input the DTC: P0125.
14.
Check the DTC judgment result.
TESTER
DISPLAY
DESCRIPTION
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
15.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insuffi...
A
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and
check for permanent DTCs
.
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
16.
WIRING DIAGRAM
Refer to DTC P0115
.
INSPECTION PROCEDURE
HINT:
If DTC P0115, P0116, P0117 or P0118 is set simultaneously with DTC P0125, the Engine Coolant
Temperature (ECT) sensor may have an open or a short circuit. Troubleshoot those DTCs first.
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and
other data from the time the malfunction occurred.
PROCEDURE
1.
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read DTCs.
Result
RESULT
PROCEED TO
P0125 is output
A
P0125 and other DTCs are output
B
HINT:
If any DTCs other than P0125 are output, troubleshoot those DTCs first.
B
GO TO DTC CHART
2.
INSPECT THERMOSTAT
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insuffi...
OK
(a) Remove the thermostat
.
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.
HINT:
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor
.
NG
REPAIR OR REPLACE COOLING SYSTEM
OK
REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insuffi...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000TB30BZX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FE 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 set when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient
engine warm-up time having elapsed.
DTC
CODE
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
ECT 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-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Coolan...
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