Toyota Avalon Service & Repair Manual: Engine Coolant Temperature Sensor 1 Signal Stuck in Range (P01152A)

Toyota Avalon Service & Repair Manual / Engine / A25a-fxs Engine Control / Sfi System / Engine Coolant Temperature Sensor 1 Signal Stuck in Range (P01152A)

DESCRIPTION

Refer to DTC P011511.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P01152A

Engine Coolant Temperature Sensor 1 Signal Stuck in Range

Either of the following conditions is met (2 trip detection logic):

  • When engine is started cold and warmed up, the engine coolant temperature sensor value does not change.
  • After the warmed up engine is stopped and then next cold engine start is performed, the engine coolant temperature sensor value does not change.
  • Water inlet with thermostat sub-assembly
  • Engine coolant temperature sensor

Comes on

DTC stored

SAE Code: P0116

MONITOR DESCRIPTION

Engine Coolant Temperature Sensor Cold Start Monitor

When a cold engine start is performed and then the engine is warmed up, if the engine coolant temperature sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and this DTC is stored.

Engine Coolant Temperature Sensor Soak Monitor

If the engine coolant temperature sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and this DTC is stored.

MONITOR STRATEGY

Related DTCs

P0116: Engine coolant temperature sensor rationality (cold start monitor)

P0116: Engine coolant temperature sensor rationality (soak monitor)

Required Sensors/Components (Main)

Engine coolant temperature sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle

Duration

10 seconds: Soak monitor

-: Cold start monitor

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Cold Start Monitor

All of the following conditions are met

-

Auxiliary battery voltage

10.5 V or higher

Time after engine start

1 second or more

Engine coolant temperature at engine start

Less than 60°C (140°F)

Soak time

0 seconds or more

Accumulated mass air flow

2172 g or more

Engine

Running

Fuel cut

Off

Intake air temperature sensor circuit fail (P0112, P0113)

Not detected

Engine coolant temperature sensor circuit fail (P0117, P0118)

Not detected

Engine water pump circuit fail (P26CA, P26CC, P26CD)

Not detected

Difference between engine coolant temperature at engine start and intake air temperature

Less than 40°C (72°F)

Soak Monitor

All of the following conditions are met

-

Auxiliary battery voltage

10.5 V or higher

Engine

Running

Soak time

5 hours or more

Either of the following conditions is met

1 or 2

1. Engine coolant temperature

60°C (140°F) or higher

2. Accumulated mass air flow

4344 g or more

Engine coolant temperature sensor circuit fail (P0117, P0118)

Not detected

Soak timer fail (P2610)

Not detected

Engine water pump circuit fail (P26CA, P26CC, P26CD)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

Cold Start Monitor

Engine coolant temperature sensor value change

Less than 5°C (9°F)

Soak Monitor

Difference between current engine coolant temperature sensor value and previous engine coolant temperature sensor value when engine stopped

Less than 5°C (9°F) (Varies with engine coolant temperature of last trip engine stop)

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 power 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 power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG) [A].
  7. Turn the Techstream on.
  8. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
  9. Check that the engine coolant temperature is 60°C (140°F) or less.
  10. Put the engine in Inspection Mode (Maintenance Mode).

    Click here

  11. Start the engine and idle it for 5 minutes or more [B].

    HINT:

    If the engine coolant temperature does not change by 5°C (9°F) or higher, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.

  12. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  13. 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.
  14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  15. Input the DTC: P01152A.
  16. 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.
    • If the judgment result is INCOMPLETE, perform steps [D] through [E].
    • [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 auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
  17. With the engine running, drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [D].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    • In the event of the drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed.
    • If the engine stops, further depress the accelerator pedal to restart the engine.
  18. Check the DTC judgment result again [E].

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • [A] to [E]: 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 auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

  • Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.

    Click here

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    Click here

HINT:

  • If any of DTCs P011511, P011515 or P012500 are output simultaneously with DTC P01152A, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
  • When the DTC is output, check the engine coolant temperature using the Techstream. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature. If the Coolant Temperature value is lower than the actual engine coolant temperature, the engine coolant temperature sensor circuit may be malfunctioning. In this case, check the wire harnesses and connectors (and those connections) between the ECM and the engine coolant temperature sensor first.
  • 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.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P01152A)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P01152A is output

A

DTC P01152A and other DTCs are output

B

HINT:

If any DTCs other than P01152A are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY

(a) Inspect the water inlet with thermostat sub-assembly (thermostat opening temperature).

Click here

HINT:

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

Click here

OK

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG

REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY

    Intake Air Temperature Sensor 1 Bank 1 Signal Stuck in Range (P01102A)

    Camshaft Position "A" - Timing Over-Retarded Bank 1 (P001200)

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