ECD SYSTEM(w/ Glow Plug Controller), Diagnostic DTC:P011B

DTC Code DTC Name
P011B Engine Coolant Temperature / Intake Air Temperature Correlation

DESCRIPTION

This engine has multiple temperature sensors, an engine coolant temperature and intake air temperature sensor (built into the mass air flow meter), to detect the temperature while the engine is operating. A thermistor, whose resistance value varies according to the temperature, is built into each sensor. When the temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes. Based on these signals, the ECM increases the fuel injection volume to improve drivability with a cold engine.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P011B

Engine Coolant Temperature / Intake Air Temperature Correlation

The difference between the readings of the intake air temperature and engine coolant temperature is higher than 14°C (25.2°F) when DTC detection drive pattern is completed

(2 trip detection logic)

  • Engine coolant temperature sensor

  • Intake air temperature sensor (built into mass air flow meter)

  • ECM

Comes on

DTC stored
Table 1. DTC Detection Drive Pattern

DTC No.

DTC Detection Drive Pattern

P011B

When the following conditions are met

  • (1) 6 hours or more have elapsed since the engine stopped on the previous trip

  • (2) intake air temperature is 0 to 60°C (32 to 140°F) when engine cranked

  • (3) Cold engine start
Table 2. Related Data List

DTC No.

Data List

P011B

  • Intake Air

  • Coolant Temp
Tip:

In order to satisfy the detection condition of this DTC, it is necessary to leave the vehicle with the engine stopped for 6 hours or more before restarting the engine.

CAUTION / NOTICE / HINT

Note:

When replacing the ECM, perform ECM Initialization and Registration.

Click here

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P011B)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    4. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      DTC P011B is output

      A

      DTC P011B and other DTCs are output

      B
      Tip:

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

    B

    GO TO DTC CHART

    Click hereClick hereClick here

    A

  2. READ VALUE USING GTS (INTAKE AIR AND COOLANT TEMP)

    1. Leave the vehicle for 6 hours or more.

      Tip:

      It is necessary to leave the vehicle for 6 hours or more to create conditions similar to the DTC detection conditions.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON and turn the GTS on.

    4. Enter the following menus: Engine and ECT / Data List / Intake Air and Coolant Temp.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Coolant Temp

      Intake Air

    5. Read the Intake Air value on the GTS.

      Standard

      Difference between the intake air temperature (Intake Air) and actual outside air temperature is within 10°C (18°F) or less.

      Tip:

      Temperature readings on the vehicle outside temperature gauge (if equipped) are not suitable for comparing to the intake air temperature reading. The outside temperature gauge has a significant delay built in to prevent swings in the temperature display. Use an accurate thermometer to determine the outside air temperature.

    6. Read the Coolant Temp value on the GTS.

      Standard

      Difference between the engine coolant temperature (Coolant Temp) and actual outside air temperature is within 10°C (18°F) or less.

      Tip:

      • If the result is not as specified, check that there are no heat sources such as a block heater in the engine compartment.

      • Temperature readings on the vehicle outside temperature gauge (if equipped) are not suitable for comparing to the intake air temperature reading. The outside temperature gauge has a significant delay built in to prevent swings in the temperature display. Use an accurate thermometer to determine the outside air temperature.

      Result

      Result

      Proceed to

      OK

      A

      NG

      (Intake Air value deviated)

      B

      NG

      (Coolant Temp value deviated)

      C
    A

    REPLACE ECM

    Click here

    B

    REPLACE MASS AIR FLOW METER

    Click here

    C

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

    Click hereClick here