RM35X0E _51 Engine / Hybrid System _078720 7GR-FKS ENGINE CONTROL _0381907 SFI SYSTEM C

7GR-FKS ENGINE CONTROL SFI SYSTEM P059712 Thermostat Heater Control Circuit Short to Battery

DESCRIPTION

An electric heater is equipped to the temperature sensing portion of the thermostat. During normal driving, current does not flow to the heater and the thermostat functions as an ordinary thermostat. When the temperature of the engine increases by a large amount such as during high-load driving, control is performed to warm the heater of the temperature sensing portion, forcing the valve to open and causing a large amount of coolant to flow to the radiator.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P059712	Thermostat Heater Control Circuit Short to Battery	Short in thermostat heater circuit and power supply circuit (1 trip detection logic).	· Short in thermostat heater circuit · Thermostat heater (built into water inlet with thermostat sub-assembly) · ECM	Comes on	DTC stored	SAE Code: P0599

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

0.438,0.031 3.458,0.375 3.021,0.344 10 false Engine Coolant Temperature: 90°C or higher 0.792,0.479 1.844,0.75 1.052,0.271 10 false Calculate Load 1.479,0.875 1.844,1.094 0.365,0.219 10 false 45% 1.417,2.031 1.833,2.281 0.417,0.25 10 false Idling 0.635,2.385 2.083,2.656 1.448,0.271 10 false Ignition Switch ON 2.938,1.854 3.198,2.094 0.26,0.24 10 false [A] 4.813,0.406 5.115,0.635 0.302,0.229 10 false [B] 6.229,3.229 6.531,3.479 0.302,0.25 10 false [C] 4.229,3 5.531,3.281 1.302,0.281 10 false 3 seconds or more

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.

10.

Stop the vehicle.

11.

Enter the following menus: Powertrain / Engine / Trouble Codes [C].

12.

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.

13.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

14.

Input the DTC: P059712.

15.

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

0.708,2.802 1.781,3 1.073,0.198 10 false Battery 1.677,1.292 2.365,1.531 0.688,0.24 10 false EFI MAIN 2.49,0.604 3.177,0.844 0.688,0.24 10 false EFI NO. 2 4.135,0.375 4.552,0.563 0.417,0.188 10 false ETM+ 4.646,0.375 5.125,0.604 0.479,0.229 10 false ETM- 5.854,0.344 6.333,0.573 0.479,0.229 10 false PTCR 5.854,2.125 6.333,2.354 0.479,0.229 10 false MREL 5.885,2.698 6.365,2.927 0.479,0.229 10 false E1 6.208,3.219 6.688,3.448 0.479,0.229 10 false ECM 0.688,0.635 1.375,0.875 0.688,0.24 10 false EFI-MAIN 0.729,1.542 0.885,1.74 0.156,0.198 10 false 1 1.406,1.542 1.563,1.74 0.156,0.198 10 false 4 3.24,0.75 3.396,0.948 0.156,0.198 10 false 8 3.229,0.281 3.531,0.531 0.302,0.25 10 false 1 5.531,0.302 5.844,0.5 0.313,0.198 10 false 22 5.542,2.042 5.854,2.24 0.313,0.198 10 false 25 5.563,2.51 5.875,2.708 0.313,0.198 10 false 1 4.01,0.927 5.656,1.604 1.646,0.677 10 false Thermostat Heater (Water Inlet with Thermostat Sub-assembly) 4.021,0.771 4.333,0.969 0.313,0.198 10 false E62 1.688,1.76 3.469,2.125 1.781,0.365 10 false No. 1 Integration Relay 3.948,0.333 4.25,0.583 0.302,0.25 10 false 1 5.094,0.344 5.396,0.594 0.302,0.25 10 false 2 5.531,0.479 5.844,0.677 0.313,0.198 10 false E4 5.521,2.229 5.833,2.427 0.313,0.198 10 false A1 5.531,2.688 5.844,2.885 0.313,0.198 10 false E3 3.198,0.49 3.51,0.688 0.313,0.198 10 false 1E 3.188,0.927 3.5,1.125 0.313,0.198 10 false 1E 1.104,1.531 1.417,1.729 0.313,0.198 10 false 1E 0.469,1.542 0.781,1.74 0.313,0.198 10 false A 0.583,2.104 1.271,2.344 0.688,0.24 10 false FL MAIN

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.