- DTC judgment completed
- System normal
| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000002046A |
| Model Year Start: 2022 | Model: RAV4 | Prod Date Range: [12/2021 - ] |
| Title: A25A-FKS (ENGINE CONTROL): SFI SYSTEM: P012800,P012807; Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); 2022 - 2024 MY RAV4 RAV4 HV [12/2021 - ] | ||
|
DTC |
P012800 |
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) |
|
DTC |
P012807 |
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure |
DESCRIPTION
The ECM uses the engine coolant temperature sensor, installed to the water outlet, to monitor the operation of the thermostat.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
|
P012800 |
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) |
All of the following conditions are met for 5 seconds or more (2 trip detection logic):
|
|
Comes on |
DTC stored |
|
|
P012807 |
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure |
All of the following conditions are met for 30 seconds or more (2 trip detection logic)*1:
All of the following conditions are met for 3 times (2 trip detection logic)*2:
|
|
Comes on |
DTC stored |
|
- *1: w/ Grille Shutter System
- *2: w/o Grille Shutter System
MONITOR DESCRIPTION
P012800: Judgment by Simulated Engine Coolant Temperature
The ECM estimates the engine coolant temperature based on the starting temperature, engine loads, and engine speeds. The ECM then compares the estimated temperature with the actual engine coolant temperature. When the estimated engine coolant temperature reaches 75°C (167°F), the ECM checks the actual engine coolant temperature. If the actual engine coolant temperature is less than 75°C (167°F), the ECM interprets this as a malfunction in the thermostat or the engine cooling system and stores the DTC.
P012807: Judgment by Engine Coolant Temperature and No. 2 Engine Coolant Temperature Changes (w/ Grille Shutter System)
When the engine coolant temperature is less than 75°C (167°F) and the water inlet housing with water pump sub-assembly is operating, if the rate of change and detected temperature of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor differ by less than 0.1°C/sec. and 6.6°C respectively for a certain amount of time, the ECM will determine that the thermostat is stuck open, illuminate the MIL and store a DTC.
P012807: Judgment by Engine Coolant Temperature Change at High Vehicle Speed (w/o Grille Shutter System)
When the vehicle is being driven between 65 and 128 km/h (40.625 and 80 mph) and the monitoring conditions are met, the change in engine coolant temperature is monitored. The amount of change is judged to be normal or abnormal every 13 seconds, in order to monitor the thermostat operation. If the engine coolant temperature changes more than the threshold, the thermostat is judged as normal, but if it changes less than the threshold, the thermostat is judged to be malfunctioning. If an abnormal judgment is made 3 times, the ECM will illuminate the MIL and store a DTC.
MONITOR STRATEGY
w/ Grille Shutter System
|
Related DTCs |
P0128: Coolant thermostat (judgment by simulated engine coolant temperature) P0128: Coolant thermostat (judgment by engine coolant temperature and No. 2 engine coolant temperature changes) |
|
Required Sensors/Components (Main) |
Thermostat Engine coolant temperature sensor |
|
Required Sensors/Components (Related) |
Intake air temperature sensor No. 2 engine coolant temperature sensor |
|
Frequency of Operation |
Once per driving cycle |
|
Duration |
240 seconds: Judgment by simulated engine coolant temperature -: Judgment by engine coolant temperature and No. 2 engine coolant temperature changes |
|
MIL Operation |
2 driving cycles |
|
Sequence of Operation |
None |
w/o Grille Shutter System
|
Related DTCs |
P0128: Coolant thermostat (judgment by simulated engine coolant temperature) P0128: Coolant thermostat (judgment by engine coolant temperature change at high vehicle speed) |
|
Required Sensors/Components (Main) |
Thermostat Engine coolant temperature sensor |
|
Required Sensors/Components (Related) |
Intake air temperature sensor (for mass air flow meter sub-assembly) Vehicle speed sensor |
|
Frequency of Operation |
Once per driving cycle: Judgment by simulated engine coolant temperature Continuous: Judgment by engine coolant temperature change at high vehicle speed |
|
Duration |
300 seconds: Judgment by simulated engine coolant temperature -: Judgment by engine coolant temperature change at high vehicle speed |
|
MIL Operation |
2 driving cycles |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
ALL
|
Monitor runs whenever the following DTCs are not stored |
P0010, P1360, P1362, P1364, P1366, P2614 (Motor drive VVT system control module) P0011 (VVT system - advance) P0012 (VVT system - retard) P0013 (Exhaust VVT oil control solenoid) P0014 (Exhaust VVT system - advance) P0015 (Exhaust VVT system - retard) P0016 (VVT system - misalignment) P0017 (Exhaust VVT system - misalignment) P0031, P0032, P101D (Air fuel ratio sensor (sensor 1) heater) P0087, P0088, P0191, P0192, P0193 (Fuel pressure sensor (for high pressure side)) P0101, P0102, P0103 (Mass air flow meter) P0107, P0108 (Manifold absolute pressure) P0111, P0112, P0113 (Intake air temperature sensor) P0116, P0117, P0118 (Engine coolant temperature sensor) P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor) P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor (sensor 1)) P0171, P0172 (Fuel system) P0201, P0202, P0203, P0204, P062D, P21CF, P21D0, P21D1, P21D2 (Fuel injector) P0300 - P0304 (Misfire) P0335, P0337, P0338 (Crankshaft position sensor) P0340, P0342, P0343 (Camshaft position sensor) P0365, P0367, P0368 (Exhaust camshaft position sensor) P0400 (EGR system) P0401 (EGR system (closed)) P0489, P0490 (EGR control circuit) P0500 (Vehicle speed sensor) P059F, P05A4 (Active grille air shutter) P107B, P107C, P107D (Fuel pressure sensor (for low pressure side)) P11EA, P11EC, P11ED, P11EE, P11EF, P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance) P1235 (High pressure fuel pump circuit) |
Judgment by Simulated Engine Coolant Temperature
|
Battery voltage |
11 V or higher |
|
Either of the following conditions is met |
1 or 2 |
|
1. All of the following conditions are met |
- |
|
Engine coolant temperature at engine start - Intake air temperature (for mass air flow meter sub-assembly) at engine start |
-15 to 7°C (-27 to 12.6°F) |
|
Engine coolant temperature at engine start |
-10 to 56°C (14 to 133°F) |
|
Intake air temperature (for mass air flow meter sub-assembly) at engine start |
-10 to 56°C (14 to 133°F) |
|
2. All of the following conditions are met |
- |
|
Engine coolant temperature at engine start - Intake air temperature (for mass air flow meter sub-assembly) at engine start |
Higher than 7°C (12.6°F) |
|
Engine coolant temperature at engine start |
56°C (133°F) or less |
|
Intake air temperature (for mass air flow meter sub-assembly) at engine start |
-10°C (14°F) or higher |
|
Accumulated time at vehicle speed of 128 km/h (80 mph) or more |
Less than 20 seconds |
Judgment by Engine Coolant Temperature and No. 2 Engine Coolant Temperature Changes (w/ Grille Shutter System)
|
Battery voltage |
11 V or higher |
|
Engine coolant temperature at first engine start |
-10°C (14°F) or higher |
|
Target engine coolant flow by engine water pump |
1.5 L/min or higher |
|
Engine coolant temperature sensor malfunction (P0117, P0118) |
Not detected |
|
No. 2 engine coolant temperature sensor malfunction (P00B3, P00B4) |
Not detected |
Judgment by Engine Coolant Temperature Change at High Vehicle Speed (w/o Grille Shutter System)
|
During that all of the following conditions are met |
13 seconds or more |
|
Battery voltage |
11 V or higher |
|
Engine coolant temperature at engine start |
-10°C (14°F) or higher |
|
Intake air temperature at engine start |
-10°C (14°F) or higher |
|
Target engine coolant flow by engine water pump |
1.5 L/min or more |
|
Vehicle speed |
65 to 128 km/h (40.625 to 80 mph) |
TYPICAL MALFUNCTION THRESHOLDS
P012800: Judgment by Simulated Engine Coolant Temperature
|
Duration that both of the following conditions are met |
5 seconds or more |
|
(a) Estimated engine coolant temperature |
75°C (167°F) or higher |
|
(b) Engine coolant temperature sensor output |
Less than 75°C (167°F) |
Judgment by Engine Coolant Temperature and No. 2 Engine Coolant Temperature Changes (w/ Grille Shutter System)
|
Engine coolant temperature change speed |
Less than -0.4°C/sec (31°F/sec), or higher than 0.15°C/sec (32.27°F/sec) |
|
Engine coolant temperature |
Less than 75°C (167°F) |
|
Grade of engine coolant temperature - No. 2 engine coolant temperature |
Higher than -0.1°C/sec (-0.18°F/sec), and less than 0.1°C/sec (0.18°F/sec) |
|
Absolute engine coolant temperature - No. 2 engine coolant temperature |
Less than 6.6°C (11.8°F) |
P012807: Judgment by Engine Coolant Temperature Change at High Vehicle Speed (w/o Grille Shutter System)
|
Malfunction counter |
3 times or more |
|
Malfunction counter is incremented when following conditions are met |
A and B |
|
A. Average engine coolant temperature change (vary with current engine coolant temperature, estimated ambient air temperature, intake air mass and vehicle speed) |
Less than -0.1°C/sec (-0.18°F/sec) |
|
B. Engine coolant temperature is satisfied throughout this period |
Less than 75°C (167°F) |
CONFIRMATION DRIVING PATTERN
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
![2021 - 2024 MY RAV4 RAV4 HV [08/2020 - ]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Stop the engine and allow it to soak.
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON [A].
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature and Intake Air Temperature.
- Check that the value of the Data List item Coolant Temperature is 56°C (133°F) or less and the value of the Data List item Intake Air Temperature is between 0 and 35°C (32 and 95°F).
- Set the heater control to MAX HOT with fresh air mode selected and turn the A/C off.
-
Start the engine and drive the vehicle at 80 km/h (50 mph) or more for 20 minutes [B].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
-
After the value of the Data List item Coolant Temperature stabilizes, check that it is 75°C (167°F) or higher.
HINT:
If the value of the Data List item Coolant Temperature is less than 75°C (167°F) while driving the vehicle at 80 km/h (50 mph), inspect the cooling system and thermostat.
- Enter the following menus: Powertrain / Engine / Trouble Codes [C].
-
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.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P012800 or P012807.
-
Check the DTC judgment result.
Techstream Display
Description
NORMAL
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
- If the judgment result is INCOMPLETE, If the judgment result is INCOMPLETE, perform steps [D] through [G].
-
[A] to [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
- With the engine stopped, leave the vehicle outside overnight [D].
- Turn the ignition switch to ON [E].
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
- Check that the value of the Data List item Coolant Temperature is 25°C (77°F) or less.
-
Start the engine and drive the vehicle at 90 km/h (56 mph) or more for 20 minutes [F].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Enter the following menus: Powertrain / Engine / Trouble Codes [G].
-
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.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P012800 or P012807.
-
Check the DTC judgment result again.
Techstream 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
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
-
[D] to [G]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
CAUTION / NOTICE / HINT
HINT:
- When the DTC is output, check the engine coolant temperature using the Techstream. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature. If the Coolant Temperature value is lower than the actual engine coolant temperature, the engine coolant temperature sensor circuit may be malfunctioning. In this case, check the wire harnesses and connectors (and those connections) between the ECM and the engine coolant temperature sensor first.
- Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 P012800) |
(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 / Trouble Codes.
(e) Read the DTCs.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC P012800 is output |
A |
|
DTC P012807 is output (w/ Grille Shutter System) |
|
|
DTC P012807 is output (w/o Grille Shutter System) |
B |
|
DTC P012800, P012807 and other DTCs are output |
C |
HINT:
If any DTCs other than P012800 or P012807 are output, troubleshoot those DTCs first.
| B |
|
| C |
|
GO TO DTC CHART
|
|
|
2. |
CHECK ENGINE COOLING SYSTEM |
(a) Check for defects in the engine cooling system that might cause the system to be too cold, such as abnormal cooling fan operation or any modifications.
| NG |
|
REPAIR OR REPLACE ENGINE COOLING SYSTEM |
|
|
3. |
INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY |
(a) Inspect the water inlet with thermostat sub-assembly (thermostat opening temperature).
Click here
| NG |
|
REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
|
|
|
4. |
INSPECT ENGINE COOLANT TEMPERATURE SENSOR |
(a) Inspect the engine coolant temperature sensor.
Click here
HINT:
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
Click here
|
Result |
Proceed to |
|---|---|
|
OK (w/ Grille Shutter System) |
A |
|
OK (w/o Grille Shutter System) |
B |
|
NG |
C |
| B |
|
REPLACE ECM
|
| C |
|
|
|
5. |
INSPECT NO. 2 ENGINE COOLANT TEMPERATURE SENSOR |
(a) Inspect the No. 2 engine coolant temperature sensor.
Click here
| OK |
|
REPLACE ECM
|
| NG |
|
|
6. |
CHECK DTC OUTPUT (AUTOMATIC TRANSAXLE SYSTEM) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Enter the following menus: Powertrain / Transmission / Trouble Codes.
(d) Check for DTCs.
Powertrain > Transmission > Trouble Codes
HINT:
If DTCs related to the ATF temperature are output, troubleshoot those DTCs first.
|
Result |
Proceed to |
|---|---|
|
No DTCs are output. |
A |
|
DTCs are output. |
B |
| B |
|
GO TO DTC CHART (AUTOMATIC TRANSAXLE SYSTEM)
|
|
|
7. |
INSPECT FLOW SHUTTING VALVE (FOR HEATER CONTROL) (WATER BY-PASS HOSE ASSEMBLY) |
(a) Cool the engine.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine / Active Test / Activate the Coolant Water Route Switching Valve / Data List / Engine Speed and Coolant Water Route Switching Valve.
Powertrain > Engine > Active Test
|
Active Test Display |
|---|
|
Activate the Coolant Water Route Switching Valve |
|
Data List Display |
|---|
|
Engine Speed |
|
Coolant Water Route Switching Valve |
(f) Perform the Active Test to close the flow shutting valve (for Heater Control).
(g) Start the engine.
(h) With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 1500 rpm for 15 seconds.
(i) During the engine warm-up process, touch the flow shutting valve (for Heater Control) outlet and inlet hoses and check if there is a difference in temperature.
OK:
There is a difference in temperature.
HINT:
- P012807 may also be output if the flow shutting valve (for Heater Control) cannot fully close while the engine is cool.
- If the flow shutting valve (for Heater Control) is closed during the engine warm-up process, there will be a difference in temperature between the outlet and inlet hoses.
| NG |
|
REPLACE FLOW SHUTTING VALVE (FOR HEATER CONTROL) (WATER BY-PASS HOSE ASSEMBLY)
|
|
|
8. |
INSPECT FLOW SHUTTING VALVE (FOR ATF CONTROL) (NO. 1 WATER BY-PASS HOSE) |
(a) Cool the engine.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine / Active Test / Activate the Coolant Water Route Switching Valve 2 / Data List / Engine Speed and Coolant Water Route Switching Valve 2.
Powertrain > Engine > Active Test
|
Active Test Display |
|---|
|
Activate the Coolant Water Route Switching Valve 2 |
|
Data List Display |
|---|
|
Engine Speed |
|
Coolant Water Route Switching Valve 2 |
(f) Perform the Active Test to close the flow shutting valve (for ATF Control).
(g) Start the engine.
(h) With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 1500 rpm for 15 seconds.
(i) During the engine warm-up process, touch the flow shutting valve (for ATF Control) outlet and inlet hoses and check if there is a difference in temperature.
OK:
There is a difference in temperature.
HINT:
- P012807 may also be output if the flow shutting valve (for ATF Control) cannot fully close while the engine is cool.
- If the flow shutting valve (for ATF Control) is closed during the engine warm-up process, there will be a difference in temperature between the outlet and inlet hoses.
| OK |
|
| NG |
|
REPLACE FLOW SHUTTING VALVE (FOR ATF CONTROL) (NO. 1 WATER BY-PASS HOSE)
|
|
|