Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open (P011515)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open (P011515)

DESCRIPTION

Refer to DTC P011511.

Click here

HINT:

When DTC P011515 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P011515

Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open

The engine coolant temperature sensor output voltage is higher than 4.91 V for 0.5 seconds or more (1 trip detection logic).
  • Open or short in engine coolant temperature sensor circuit
  • Engine coolant temperature sensor
  • ECM

Comes on

DTC stored

SAE Code: P0118

HINT:

When this DTC is output, check the engine coolant temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

DTC No.

Coolant Temperature

Malfunction

P011515

-40°C (-40°F)
  • Short to +B in THW circuit
  • Open in THW circuit
  • Open in ETHW circuit

If the Data List values is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

MONITOR DESCRIPTION

The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. If the engine coolant temperature sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the engine coolant temperature sensor circuit and stores this DTC.

Example:

If the engine coolant temperature sensor output voltage is higher than 4.91 V for 0.5 seconds or more, the ECM store this DTC.

MONITOR STRATEGY

Related DTCs

P0118: Engine coolant temperature sensor range check (high voltage)

Required Sensors/Components (Main)

Engine coolant temperature sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

0.5 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

-

Battery voltage

8 V or higher

Engine switch

On (IG)

Starter

Off

TYPICAL MALFUNCTION THRESHOLDS

Engine coolant temperature sensor voltage [Engine coolant temperature]

Higher than 4.91 V [Less than -59°C (-74°F)]

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

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Wait 0.5 seconds or more [B].
  9. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  10. 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.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Input the DTC: P011515.
  13. 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • [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 P011511.

Click here

CAUTION / NOTICE / HINT

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.

READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)

*1

Engine Coolant Temperature Sensor

*2

ECM

*a

Front view of wire harness connector

(to Engine Coolant Temperature Sensor)

-

-

(a) Disconnect the engine coolant temperature sensor connector.

(b) Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List

Tester Display

Coolant Temperature

(g) Read the value displayed on the Techstream.

Standard value:

140°C (284°F)

HINT:

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

Click here

OK

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG

2.

CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

(a) Disconnect the engine coolant temperature sensor 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

D19-2 - D2-101 (THW)

Always

Below 1 Ω

D19-1 - D2-133 (ETHW)

Always

Below 1 Ω

D19-2 or D2-101 (THW) - Other terminals

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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