Toyota Tundra (2015 year). Manual — part 1128
HINT:
MONITOR DESCRIPTION
The ECM monitors the difference between the Engine Coolant Temperature (ECT) and the Intake Air Temperature
(IAT) when the engine is started cold to detect the engine temperature conditions accurately. The monitor runs
when the engine is started cold after 7 hours or more have elapsed since the engine was stopped (ignition switch
turned off) on the previous trip. If the difference between the engine coolant temperature and the intake air
temperature on a cold start is 25°C (45°F) or more, or if the engine coolant temperature is more than 25°C
(45°F) lower than the intake air temperature, the ECM interprets this as a malfunction in the engine coolant
temperature sensor circuit and intake air temperature sensor circuit, and sets the DTC.
MONITOR STRATEGY
Related DTCs
P011B: Engine Coolant Temperature (ECT) / Intake Air Temperature (IAT)
sensor correlation
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P011B; Engin...
Required Sensors/Components
(Main)
ECT / IAT sensor
Required Sensors/Components
(Related)
-
Duration
-
MIL Operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not
stored
P0102, P0103 (Mass air flow meter)
P0112, P0113 (Intake air temperature sensor)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0125 (Insufficient coolant temperature for closed loop fuel
control)
P2610 (ECM internal engine off timer)
(a) Time engine not running after ignition switch
ON
Less than 20 seconds
(b) Soak time
7 hours or more
(c) Battery voltage
10.5 V or higher
(d) Time after engine start
15 seconds or more
(a) Minimum IAT after engine start
-10°C (14°F) or higher
(b) ECT before engine start
-10°C (14°F) or higher
TYPICAL MALFUNCTION THRESHOLDS
Temperature deviation (difference between ECT and IAT)
More than 25°C (45°F) or less than -25°C (-45°F)
CONFIRMATION DRIVING PATTERN
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P011B; Engin...
Connect the Techstream to the DLC3.
1.
Turn the ignition switch to ON and turn the Techstream on.
2.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) [A].
3.
Turn the ignition switch off.
4.
With the engine stopped, leave the vehicle as is for 7.5 hours or more [B].
5.
Start the engine and wait 60 seconds or more [C].
6.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
7.
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.
8.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
9.
Input the DTC: P011B.
10.
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
11.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P011B; Engin...
A
HINT:
If the judgment result shows INCOMPLETE or N/A, perform steps [A] through [D] again.
If 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.
12.
INSPECTION PROCEDURE
PROCEDURE
1.
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P011B)
(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
PROCEED TO
P011B output
A
P011B and other DTCs output
B
HINT:
If any DTCs other than P011B are output, troubleshoot those DTCs first.
B
GO TO DTC CHART
2.
READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)
(a) Leave the vehicle for 7 hours or more.
HINT:
It is necessary leave the vehicle for 7 hours or more to create conditions similar to the DTC detection
conditions.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P011B; Engin...
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