- DTC judgment completed
- System normal
| Last Modified: 11-20-2023 | 6.11:8.1.0 | Doc ID: RM1000000015G9S |
| Model Year Start: 2018 | Model: Camry HV | Prod Date Range: [07/2017 - 09/2018] |
| Title: A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P012800; Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); 2018 MY Camry HV [07/2017 - 09/2018] | ||
|
DTC |
P012800 |
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) |
DESCRIPTION
The ECM uses the engine coolant temperature sensor, installed to the water outlet, and the No. 2 engine coolant temperature sensor, installed to the radiator pipe assembly, 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) |
Either of the following conditions is met (2 trip detection logic):
|
|
Comes on |
DTC stored |
SAE Code: P0128 |
MONITOR DESCRIPTION
Engine Coolant Temperature Sensor Output Judgment by Simulated Engine Coolant Temperature
The ECM estimates the engine coolant temperature based on the starting temperature, engine load, and engine speed. 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 of the thermostat or in the engine cooling system, illuminate the MIL and stores this DTC.
Stuck Open Detection with No. 2 Engine Coolant Temperature Sensor
If the temperature detected by the No. 2 engine coolant temperature sensor value is higher than the threshold temperature calculated based on the engine coolant temperature sensor value for (judgment timer x 0.7) seconds or more cumulatively while the engine coolant temperature is increasing, the ECM will determine that the thermostat is stuck open, illuminate the MIL and store this DTC.
MONITOR STRATEGY
|
Related DTCs |
P0128: Engine coolant temperature sensor output (judgment by simulated engine coolant temperature) P0128: Stuck open detection with radiator coolant temperature |
|
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 |
600 seconds: Engine coolant temperature sensor output (judgment by simulated engine coolant temperature) 90 seconds: Stuck open detection with radiator coolant temperature |
|
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) P0401 (EGR system (closed)) P0489, P0490 (EGR control circuit) P059F, P05A0, P05A2, P05A3, P05A4, P05A5, P05B2, P05B3, P05B4, U0284, U1293, (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) |
Engine Coolant Temperature Sensor Output (Judgment by Simulated Engine Coolant Temperature)
|
Auxiliary 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 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 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 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 at engine start |
-10°C (14°F) or higher |
|
Accumulated time that vehicle speed is 128 km/h (80 mph) or more |
Less than 20 seconds |
Stuck Open Detection with Radiator Coolant Temperature
|
Continuous time while all of the following conditions are met |
More than 1 second |
|
Auxiliary battery voltage |
11 V or higher |
|
Engine |
Running |
|
Engine coolant temperature at first engine start |
-10 to 56°C (14 to 133°F) |
|
Engine coolant temperature |
Less than 75°C (167°F) |
|
Engine coolant temperature increase from this engine start |
2°C (4°F) or higher |
|
Engine coolant temperature increase |
Higher than 0.1°C/sec. (0.2°F/sec.) |
|
Maximum engine coolant temperature during this trip |
75°C (167°F) or higher |
|
Engine coolant temperature sensor |
No malfunction |
|
No. 2 engine coolant temperature sensor |
No malfunction |
TYPICAL MALFUNCTION THRESHOLDS
Engine Coolant Temperature Sensor Output (Judgment by Simulated Engine Coolant Temperature)
|
Duration that both of the following conditions are met |
5 seconds or more |
|
Estimated engine coolant temperature |
75°C (167°F) or higher |
|
Engine coolant temperature sensor output |
Less than 75°C (167°F) |
Stuck Open Detection with Radiator Coolant Temperature
|
Period of time No. 2 engine coolant temperature sensor value exceeds threshold |
More than (Judgment timer* x 0.7) seconds |
|
*Judgment timer |
50 seconds or more |
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
![2018 - 2021 MY Camry HV [07/2017 - 08/2021]; A25A-FXS (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
- Turn the power switch off and leave the vehicle for several hours.
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) [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).
-
Put the engine in Inspection Mode (Maintenance Mode).
Click here
- Start the engine.
- Set the heater control to MAX HOT with fresh air mode selected and turn the A/C off.
-
With the engine running, drive the vehicle at 80 km/h (50 mph) for 15 minutes [B].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
If the engine stops, further depress the accelerator pedal to restart the engine.
-
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.
-
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 shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
-
If the judgment result is INCOMPLETE, let the engine cool down (engine coolant temperature is 56°C (133°F) or less), and then perform steps [A] and [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 auxiliary 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
NOTICE:
-
Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
for NICKEL METAL HYDRIDE BATTERY:
Click here
for LITHIUM-ION BATTERY:
Click here
(Select Powertrain in Health Check and then check the time stamp data.)
Click here
-
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
for NICKEL METAL HYDRIDE BATTERY:
Click here
for LITHIUM-ION BATTERY:
Click here
HINT:
- When this DTC is output, check the engine coolant temperature using the Techstream. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature. If the value of Coolant Temperature 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 their connection condition) 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 power switch on (IG).
(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 P012800 and other DTCs are output |
B |
HINT:
If any DTCs other than P012800 are output, troubleshoot those DTCs first.
| B |
|
|
|
2. |
CHECK ENGINE COOLING SYSTEM |
(a) Check for defects in the engine cooling system that might cause the system to be excessively 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 |
|
|
|
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
| NG |
|
|
|
5. |
INSPECT NO. 2 ENGINE COOLANT TEMPERATURE SENSOR |
(a) Inspect the No. 2 engine coolant temperature sensor.
Click here
| OK |
|
| NG |
|
|
|