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Toyota Sienna Service Manual: Engine Coolant Temperature / Intake Air Temperature Correlation

Toyota Sienna Service Manual / 2GR-FE Engine control system / SFI system / Diagnostic trouble code chart / Engine Coolant Temperature / Intake Air Temperature Correlation

DTC P011B Engine Coolant Temperature / Intake Air Temperature Correlation

DESCRIPTION

The ECM calculates the difference between the readings of the coolant temperature sensor and intake air temperature sensor. If the difference is greater than 20C (68F), the ECM will judge this as a malfunction and will set this DTC

DTC No.

DTC Detection Condition

Trouble Area

P011B

When conditions (a), (b), (c), (d) and (e) are met (2 trip detection)
  1.  Battery voltage is 10.5 V or more
  2.  37.5 seconds after the engine has been started after the ignition switch has been OFF for more than 7 hours
  3.  The minimum intake air temperature after the engine has been started is more than -10C (14F)
  4.  The average coolant temperature before the engine is started is more than -10C (14F)
  5.  The difference between the readings of the ECT and IAT is greater than 20C (36F)
  • IAT sensor
  •  ECT sensor
  •  ECM

DESCRIPTION

HINT:

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

1 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION P011B)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position.
  3.  Turn the tester on.
  4.  Enter the following menus: DIAGNOSIS / ENHANCED OBD ll / DTC INFO / CURRENT CODES.
  5.  Read the DTCs.

Result

Result

HINT: If any DTCs other than P011B are output, troubleshoot those DTCs first

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION P011B)

2 READ VALUE OF INTELLIGENT TESTER (INTAKE AIR TEMPERATURE)

  1. Leave the vehicle for 7 hours or more.

    HINT: It is necessary leave the vehicle for 7 hours or more to allow conditions similar to the DTC detection conditions.

  2.  Connect the intelligent tester to the DLC3.
  3.  Turn the ignition switch to the ON position.
  4.  Turn the tester ON.
  5.  Enter the following menus: DIAGNOSIS / ENHANCED OBD ll / DATA LIST / PRIMARY / INTAKE AIR.
  6.  Read the value displayed on the tester.

OK: The intake air temperature and the outside air temperature are within 10C (50F) of each other.

HINT: Temperature readings on the vehicle's outside temperature gauge (if equipped) are not suitable for comparing to the IAT reading. The outside temperature gauge has a significant delay built in to prevent temperature swings from being displayed on its display.

Use an accurate thermometer to determine the outside air temperature.

3 READ VALUE OF INTELLIGENT TESTER (COOLANT TEMPERATURE)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position.
  3.  Turn the tester ON.
  4.  Enter the following menus: DIAGNOSIS / ENHANCED OBD ll / DATA LIST / PRIMARY / COOLANT TEMP.

OK: The coolant temperature and the outside air temperature are within 10C (50F) of each other.

HINT: If the result is not as specified, check that there are heat sources such as a block heater in the engine compartment.

REPLACE ECM

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