ECD SYSTEM, Diagnostic DTC:P0263, P0266, P0269, P0272

DTC Code DTC Name
P0263 Cylinder 1 Contribution / Balance
P0266 Cylinder 2 Contribution / Balance
P0269 Cylinder 3 Contribution / Balance
P0272 Cylinder 4 Contribution / Balance

DESCRIPTION

Refer to DTC P0200 Click here.

DTC No. DTC Detection Condition Trouble Area

P0263

P0266

P0269

P0272

Conditions (a), (b) and (c) are met more than 200 times with engine speed 500 to 1,000 rpm:

(a) Engine coolant temperature: 60°C (140°F) or more

(b) Difference of compensation value between cylinders: 15 mm3/sec. or more

(c) Injection volume: 0 to 30 mm3/st

  • Open or short in EDU circuit

  • Injector

  • EDU

Tech Tips

These DTCs indicate a malfunction related to the primary circuit.


  • If DTC P0263 is displayed, check the injector No. 1 circuit.

  • If DTC P0266 is displayed, check the injector No. 2 circuit.

  • If DTC P0269 is displayed, check the injector No. 3 circuit.

  • If DTC P0272 is displayed, check the injector No. 4 circuit.

WIRING DIAGRAM

Refer to DTC P0200 on Click here.

INSPECTION PROCEDURE

Tech Tips

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.

PROCEDURE


  1. CHECK EDU (+B VOLTAGE)


    1. A01CH1QE01

      Disconnect the EDU connectors.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Condition Specified Condition
      E26-8 (+B) - E27-1 (GND) Ignition switch in the ON position 18 to 27 V

    3. Reconnect the EDU connectors.


    NG

    CHECK EDU POWER SOURCE CIRCUIT

    OK

  2. CHECK EDU (INJECTOR RESISTANCE)


    1. A01CJG0E01

      Disconnect the EDU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      E26-4 (INJ#1) - E26-5 (COM1) 20°C (68°F) 0.35 to 0.55 Ω
      E26-2 (INJ#2) - E26-6 (COM2) 20°C (68°F) 0.35 to 0.55 Ω
      E26-1 (INJ#3) - E26-6 (COM2) 20°C (68°F) 0.35 to 0.55 Ω
      E26-3 (INJ#4) - E26-5 (COM1) 20°C (68°F) 0.35 to 0.55 Ω

    3. Reconnect the EDU connector.


    OK

    CHECK HARNESS AND CONNECTOR (EDU - ECM) Click here

    NG

  3. INSPECT INJECTOR ASSEMBLY


    1. A01CHWBE17

      Disconnect the injector connectors.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 0.35 to 0.55 Ω

    3. Reconnect the injector connector.


    NG

    REPLACE INJECTOR ASSEMBLY

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EDU - INJECTOR ASSEMBLY)

  4. CHECK HARNESS AND CONNECTOR (EDU - ECM)


    1. A01CILAE01

      Disconnect the EDU connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Check for open
      Tester Connection Condition Specified Condition
      E27-6 (IJT#1) - E22-24 (#1) Always Below 1 Ω
      E27-3 (IJT#2) - E22-23 (#2) Always Below 1 Ω
      E27-2 (IJT#3) - E22-22 (#3) Always Below 1 Ω
      E27-5 (IJT#4) - E22-21 (#4) Always Below 1 Ω
      E27-7 (IJF) - E22-25 (INJF) Always Below 1 Ω
      Check for short
      Tester Connection Condition Specified Condition
      E27-6 (IJT#1) or E22-24 (#1) - Body ground Always 10 kΩ or higher
      E27-3 (IJT#2) or E22-23 (#2) - Body ground Always 10 kΩ or higher
      E27-2 (IJT#3) or E22-22 (#3) - Body ground Always 10 kΩ or higher
      E27-5 (IJT#4) or E22-21 (#4) - Body ground Always 10 kΩ or higher
      E27-7 (IJF) or E22-25 (INJF) - Body ground Always 10 kΩ or higher

    4. Reconnect the EDU connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EDU - ECM)

    OK

  5. CHECK ECM (OUTPUT VOLTAGE)


    1. A01CJ17E04

      While idling the engine, check the waveform of the ECM connectors using an oscilloscope.

      Standard
      Tester Connection Specified Condition
      E22-24 (#1) - E23-7 (E1) Correct waveform appears as shown
      E22-23 (#2) - E23-7 (E1) Correct waveform appears as shown
      E22-22 (#3) - E23-7 (E1) Correct waveform appears as shown
      E22-21 (#4) - E23-7 (E1) Correct waveform appears as shown
      E22-25 (INJF) - E23-7 (E1) Correct waveform appears as shown
      Result
      Result Proceed to
      #1 to #4 is normal INJF is abnormal A
      #1 to #4 is abnormal INJF is normal B

    NG

    REPLACE ECM

    OK

    REPLACE EDU