7GR-FKS ENGINE CONTROL SFI SYSTEM P059714 Thermostat Heater Control Circuit Short to Ground or Open
DESCRIPTION
Refer to DTC P059712.
| 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). |
·
Open or short in thermostat heater circuit ·
Thermostat heater (water inlet with thermostat sub-assembly) ·
ECM |
Comes on | DTC stored | SAE Code: P0598 |
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
| Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS 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 GTS 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.
| GTS 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.
WIRING DIAGRAM
Refer to DTC P059712.
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 GTS. 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
| *a | Front view of wire harness connector
(to Water Inlet with Thermostat Sub-assembly) |
Disconnect the water inlet with thermostat sub-assembly connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition E62-1 (ETM+) - Body ground Ignition switch ON 11 to 14 V
- Result:
Proceed to OK NG
OK
NG
Inspect the water inlet with thermostat sub-assembly.
- Result:
Proceed to OK NG
OK
NG
Disconnect the water inlet with thermostat sub-assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E62-2 (ETM-) - E4-22 (PTCR) Always Below 1 Ω E62-2 (ETM-) or E4-22 (PTCR) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG