- When cold engine started and engine warmed up, Engine Coolant Temperature (ECT) sensor value does not change.
- After warmed up engine stopped and then next cold engine start performed, ECT sensor value does not change.
| Last Modified: 7-3-2017 | 6.8:8.0.40 | Doc ID: RM000000YDB00UX |
| Model Year Start: 2007 | Model: LX470 | Prod Date Range: [08/2006 - ] |
| Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0116; Engine Coolant Temperature Circuit Range / Performance Problem; 2007 MY LX470 [08/2006 - ] | ||
|
DTC |
P0116 |
Engine Coolant Temperature Circuit Range / Performance Problem |
DESCRIPTION
Refer to DTC P0115
![2007 MY LX470 [08/2006 - ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0115,P0117,P0118; Engine Coolant Temperature Circuit+](../../../../stylegraphics/info.gif "2007 MY LX470 [08/2006 - ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0115,P0117,P0118; Engine Coolant Temperature Circuit+")
.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0116 |
When either of following conditions met (2 trip detection logic): |
|
MONITOR DESCRIPTION
ECT sensor cold start monitor
When a cold engine start is performed and then the engine is warmed up, if the ECT sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.
ECT sensor soak monitor
If the ECT sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.
MONITOR STRATEGY
|
Related DTCs |
P0116: Engine Coolant Temperature (ECT) sensor stuck (low ECT) P0116: ECT sensor stuck (high ECT) |
|
Required Sensors/Components (Main) |
Engine Coolant Temperature sensor |
|
Required Sensors/Components (Related) |
Crankshaft position sensor, IAT sensor, MAF meter |
|
Frequency of Operation |
Once per driving cycle |
|
Duration |
1 second |
|
MIL Operation |
2 driving cycles |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor will run whenever these DTCs are not present |
P0100 - P0103 (MAF sensor) |
Cold start monitor:
|
Battery voltage |
10.5 V or more |
|
Time after engine start |
1 second or more |
|
ECT at engine start |
Less than 60°C (140°F) |
|
IAT sensor circuit |
Not fail |
|
Soak time |
0 seconds or more |
|
Accumulated MAF |
2,157 g or more |
|
Fuel cut |
OFF |
|
Difference between ECT at engine start and IAT |
Less than 40°C (72°F) |
Soak monitor:
|
Battery voltage |
10.5 V or more |
|
Engine |
Running |
|
IAT sensor circuit |
Not fail |
|
Soak time |
5 hours or more |
|
ECT |
60°C (140°F) or more |
|
Accumulated MAF |
4,202 g or more |
TYPICAL MALFUNCTION THRESHOLDS
Cold start monitor:
|
Engine coolant temperature change |
Less than 5°C (9°F) |
Soak monitor:
|
Difference between current ECT sensor value and previous ECT sensor value when engine stopped |
Less than 5°C (9°F) |
COMPONENT OPERATING RANGE
|
Engine coolant temperature |
Varies with actual engine coolant temperature |
WIRING DIAGRAM
Refer to DTC P0115
.
INSPECTION PROCEDURE
HINT:
- If DTC P0115, P0116, P0117, P0118 and P0125 are output simultaneously, the ECT sensor circuit may be open or shorted. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 OTHER DTC OUTPUT (IN ADDITION TO DTC P0116) |
(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
(b) Turn the ignition switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
(d) Read the DTCs.
|
Display (DTC output) |
Proceed to |
|---|---|
|
P0116 |
A |
|
P0116 and other DTCs |
B |
| B |
|
|
|
2. |
INSPECT THERMOSTAT |
(a)
Remove the thermostat
.
(b) Check the valve opening temperature of the thermostat.
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 |
|
| OK |
|
|
|