ECD SYSTEM, Diagnostic DTC:P0488

DTC Code DTC Name
P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance

DESCRIPTION

The throttle control motor opens and closes the throttle valve according to a duty-cycle (signal) from the ECM.

DTC No. DTC Detection Condition Trouble Area
P0488

Condition (a) or (b) continues for more than 1 second

(a) Battery voltage: 18.5 V or more


  • Throttle motor's activation duty is out of the normal range (Activation duty: 10 to 90)

(b) Open, short or stuck in throttle sensor

  • Open or short in throttle control motor circuit

  • Throttle control motor

  • ECM

WIRING DIAGRAM

A01CI1XE01

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 THROTTLE CONTROL MOTOR (+B VOLTAGE)


    1. A01CJA3E01

      Turn the ignition switch to the ON position.

    2. Disconnect the throttle control motor connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      I12-2 (+B) - Body ground Ignition switch in the ON position 18 to 27 V

    4. Reconnect the throttle control motor connector.


    NG

    CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM) Click here

    OK

  2. CHECK THROTTLE CONTROL MOTOR


    1. Check the throttle control motor Click here.


    NG

    REPLACE DIESEL THROTTLE BODY ASSEMBLY (THROTTLE CONTROL MOTOR)

    OK

  3. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)


    1. A01CH61E01

      Disconnect the throttle control motor 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
      I12-1 (DUTY) - E23-4 (LUSL) Always Below 1 Ω
      I12-3 (GND) - Body ground Always Below 1 Ω
      Check for short
      Tester Connection Condition Specified Condition
      I12-1 (DUTY) or E23-4 (LUSL) - Body ground Always 10 kΩ or higher

    4. Reconnect the throttle control motor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE CONTROL MOTOR - ECM)

    OK

    REPLACE ECM