- DTC judgment completed
- System normal
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001HTLE |
| Model Year Start: 2020 | Model: Corolla Hatchback | Prod Date Range: [03/2019 - 11/2022] |
| Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P059714; Thermostat Heater Control Circuit Short to Ground or Open; 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 11/2022] | ||
|
DTC |
P059714 |
Thermostat Heater Control Circuit Short to Ground or Open |
DESCRIPTION
Refer to DTC P059712.
Click here
![2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P059712; Thermostat Heater Control Circuit Short to Battery+](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
|
P059714 |
Thermostat Heater Control Circuit Short to Ground or Open |
Open or short in thermostat heater circuit and power supply circuit (1 trip detection logic). |
|
Comes on |
DTC stored |
|
Related Data List
|
DTC No. |
Data List |
|---|---|
|
P059714 |
Coolant Temperature |
MONITOR DESCRIPTION
The ECM monitors the output voltage while the thermostat heater is operating.
The thermostat heater turns on and off according to ON/OFF switching of a transistor inside the ECM.
If a continuous mismatch occurs between the ECM transistor state and the output voltage, the ECM determines there is a malfunction in the thermostat heater circuit and stores a DTC.
MONITOR STRATEGY
|
Related DTCs |
P0598: Thermostat heater range check (low voltage) |
|
Required Sensors/Components (Main) |
Thermostat heater |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
3 seconds |
|
MIL Operation |
Immediate |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
None |
|
All of the following conditions are met |
- |
|
Either of the following conditions is met |
1 or 2 |
|
1. Both of the following conditions are met |
(a) and (b) |
|
(a) Last thermostat heater output terminal voltage level |
Low |
|
(b) Current thermostat heater output terminal voltage level |
Low |
|
2. Both of the following conditions are met |
(c) and (d) |
|
(c) Last thermostat heater output terminal voltage level |
High |
|
(d) Current thermostat heater output terminal voltage level |
High |
|
Battery voltage |
8 V or higher |
|
Starter |
Off |
|
Command to thermostat heater |
Off |
TYPICAL MALFUNCTION THRESHOLDS
|
Thermostat heater output terminal voltage level |
Low |
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
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for at least 30 seconds.
- Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Data List / Calculate Load and Coolant Temperature.
-
Drive the vehicle for at least 3 seconds at the Calculate Load of 45% or more and the Coolant Temperature of 90°C (194°F) or higher [B].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Stop the vehicle.
- 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: P059714.
-
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.
-
[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.
WIRING DIAGRAM
Refer to DTC P059712.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
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 TERMINAL VOLTAGE (POWER SOURCE OF THERMOSTAT HEATER) |
|
*a |
Front view of wire harness connector (to Water Inlet with Thermostat Sub-assembly) |
(a) Disconnect the water inlet with thermostat sub-assembly connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Z5-1 - Body ground |
Ignition switch ON |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (THERMOSTAT HEATER - NO. 1 INTEGRATION RELAY) |
|
|
2. |
INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY |
(a) Inspect the water inlet with thermostat sub-assembly.
Click here
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (THERMOSTAT HEATER - ECM) |
(a) Disconnect the water inlet with thermostat sub-assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Z5-2 - C76-7 (HTHM) |
Always |
Below 1 Ω |
|
Z5-2 or C76-7 (HTHM) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
REPLACE ECM
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|