Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000YSRG |
Model Year Start: 2017 |
Model: Sienna |
Prod Date Range: [08/2016 -
] |
Title: 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: P059712; Thermostat Heater Control Circuit Short to Battery; 2017 - 2020 MY Sienna [08/2016 - ] |
DTC
|
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
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Thermostat heater (water inlet with thermostat sub-assembly)
-
ECM
|
Comes on
|
DTC stored
|
-
SAE Code: P0599
-
DTC for Mexico Models: Applies
|
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
|
P0599: Thermostat heater range check (high 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 command to thermostat heater
|
Off
|
(b) Current command to thermostat heater
|
Off
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2. Both of the following conditions are met
|
(c) and (d)
|
(c) Last command to thermostat heater
|
On
|
(d) Current command to thermostat heater
|
On
|
Battery voltage
|
8 V or higher
|
Starter
|
Off
|
Command to thermostat heater
|
On
|
TYPICAL MALFUNCTION THRESHOLDS
Thermostat heater output terminal voltage level
|
High
|
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
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Connect the Techstream to the DLC3.
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Turn the ignition switch to ON and turn the Techstream on.
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Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
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Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON and turn the Techstream on.
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Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
-
Enter the following menus: Powertrain / Engine / Data List / Calculate Load and Coolant Temperature.
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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.
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Input the DTC: P059712.
-
Check the DTC judgment result.
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
|
WIRING DIAGRAM
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.
|
INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
|
(a) Inspect the water inlet with thermostat sub-assembly.
Click here
OK
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (WATER INLET WITH THERMOSTAT SUB-ASSEMBLY - ECM)
|
(a) Disconnect the B63 water inlet with thermostat sub-assembly connector.
(b) Disconnect the B67 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
B63-2 (ETM-) or B67-64 (PTCR) - other terminals
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
3.
|
CHECK WHETHER DTC OUTPUT RECURS (DTC P059712)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs.
(e) Turn the ignition switch off and wait for at least 30 seconds.
(f) Start the engine.
(g) Turn the Techstream on.
(h) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Trouble Codes.
(j) Read the DTCs.
Result
|
Proceed to
|
DTCs are not output
|
A
|
DTC P059712 is output
|
B
|
|