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Toyota Sienna Service Manual: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Toyota Sienna Service Manual / Engine / 2Gr-fe engine control system / Sfi system / Diagnostic trouble code chart / Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

HINT:

This DTC relates to the thermostat.

DESCRIPTION

This DTC is set when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time.

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

MONITOR DESCRIPTION

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

The ECM estimates the ECT based on the starting temperature, engine loads, and engine speeds. The ECM then compares the estimated temperature with the actual ECT. When the estimated ECT reaches 75°C (167°F), the ECM checks the actual ECT. If the actual ECT is less than 75°C (167°F), the ECM interprets this as a malfunction in the thermostat or the engine cooling system and sets the DTC.

MONITOR STRATEGY

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position.

(c) Turn the tester on.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(e) Read the DTCs.

Result

HINT: If any DTCs other than P0128 are output, troubleshoot those DTCs first.

2 CHECK COOLING SYSTEM

(a) Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications.

3 INSPECT THERMOSTAT

(a) Remove the thermostat (See page CO-16).

(b) Check the valve opening temperature of the thermostat (See page CO-17).

Standard: 80 to 84°C (176 to 183°F)

HINT:

In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

(c) Reinstall the thermostat (See page CO-17).

REPLACE ECM (See page ES-498)

Insufficient Coolant Temperature for Closed Loop Fuel Control
DESCRIPTION Refer to DTC P0115 (See page ES-133). MONITOR DESCRIPTION The resistance of the ECT sensor varies in proportion to the actual ECT. The ECM supplies a constant voltage to the ...

Oxygen Sensor Circuit
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Other materials:

Installation
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Data list / active test
HINT: By accessing the DATA LIST displayed by the intelligent tester, you can perform such functions as reading the values of switches and sensors without removing any parts. Reading the DATA LIST as the first step in troubleshooting is one method to shorten labor time. 1. DATA LIST FOR OCCUPA ...

CD Abnormal/ Excess Current/ Tray Insertion / Ejection Error/ CD Abnormal/ Excess Current/ Tray Insertion / Ejection Error
DTC 62-44 CD Abnormal DTC 62-48 Excess Current DTC 62-50 Tray Insertion / Ejection Error DTC 63-44 CD Abnormal DTC 63-48 Excess Current DTC 63-50 Tray Insertion / Ejection Error DESCRIPTION DTC No. DTC Detecting Condition Trouble Area 62-44 Operation error ...

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