Toyota Tundra (2015 year). Manual — part 1524
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000T9P0FWX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insufficient Coolant Temperature for Closed
Loop Fuel Control; 2015 MY Tundra [08/2014 - ]
DTC
P0125
Insufficient Coolant Temperature for Closed Loop Fuel Control
DESCRIPTION
Refer to DTC P0115
.
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0125
Engine Coolant Temperature (ECT) does not reach closed-loop
enabling temperature for 20 minutes (this period varies with engine
start ECT)
(2 trip detection logic)
ECT sensor
Cooling
system
Thermostat
MONITOR DESCRIPTION
Example:
The ECT is 0°C (32°F) at engine start. After about 1 minute running time, the ECT sensor still indicates that
the engine is not warm enough to begin closed-loop fuel (air-fuel ratio feedback) control. The ECM interprets
this as a malfunction in the sensor or cooling system and sets the DTC.
MONITOR STRATEGY
Related DTCs
P0125: Insufficient engine coolant temperature for closed-loop fuel
control
Required Sensors/Components
(Main)
Thermostat, cooling system
Required Sensors/Components
(Related)
Engine coolant temperature sensor and mass air flow meter
Duration
for 100 L (26.4 US gal) Fuel Tank:
62 seconds: Engine coolant temperature at engine start
-8.33°C (17°F) or more
107 seconds: Engine coolant temperature at engine start
-19.44 to -8.33°C (-3 to 17°F)
20 minutes: Less than engine coolant temperature at engine
start -19.44°C (-3°F)
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insuff...
for 144 L (38 US gal) Fuel Tank:
71 seconds: Engine coolant temperature at engine start
-8.33°C (17°F) or more
125 seconds: Engine coolant temperature at engine start
-19.44 to -8.33°C (-3 to 17°F)
20 minutes: Less than engine coolant temperature at engine
start -19.44°C (-3°F)
MIL Operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not stored
None
Mass air flow meter sensor circuit failure (P0101, P0102, P0103)
Not detected
Intake air temperature sensor circuit failure (P0112, P0113)
Not detected
Engine coolant temperature sensor circuit failure (P0115, P0117, P0118)
Not detected
Thermostat failure (P0128)
Not detected
TYPICAL MALFUNCTION THRESHOLDS
Time until actual engine coolant temperature reaches
closed loop fuel control enabling temperature
for 100 L (26.4 US gal) Fuel Tank:
62 seconds: Engine coolant temperature at engine
start -8.33°C (17°F) or more
107 seconds: Engine coolant temperature at
engine start -19.44 to -8.33°C (-3 to 17°F)
20 minutes: Less than engine coolant temperature
at engine start -19.44°C (-3°F)
for 144 L (38 US gal) Fuel Tank:
71 seconds: Engine coolant temperature at engine
start -8.33°C (17°F) or more
125 seconds: Engine coolant temperature at
engine start -19.44 to -8.33°C (-3 to 17°F)
20 minutes: Less than engine coolant temperature
at engine start -19.44°C (-3°F)
CONFIRMATION DRIVING PATTERN
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insuff...
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 menus: 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.
Wait 21 minutes or more [B].
10.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
11.
Read the pending DTC.
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-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insuff...
A
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 stored 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
(a) Remove the thermostat
.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0125; Insuff...
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