ECD SYSTEM, Diagnostic DTC:P1621, P1667, P1673

DTC Code DTC Name
P1621 Microcontroller Communication not Plausible
P1667 Conversion A/D not Plausible Test on Pedal Value Track 2
P1673 Time Unit Control not Plausible

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area Possible to Detect
Ignition Switch Engine Run
P1621

ECM fault

(1 trip detection logic)

  • ECM

 ON ON
P1667

ECM fault

(1 trip detection logic)

  • ECM

 ON ON
P1673 ECM fault

  • ECM

 ON ON

FAIL-SAFE

DTC No. Fail-safe Operation Fail-safe Deactivation Condition
P1621

  • Cut-off injector piezo power stage.

  • Engine stall.

 Ignition switch OFF.
P1667 Limits the engine speed (2,000 rpm). Ignition switch OFF.
P1673

  • Cut-off injector piezo power stage.

  • Engine stall.

 Ignition switch OFF.

INSPECTION PROCEDURE

Tech Tips


  • If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.

  • Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).

PROCEDURE


  1. CHECK DTC OUTPUT (P1621, P1667 AND/OR P1673)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the intelligent tester ON.

    3. Clear the DTC Click here.

    4. Select the following menu items: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs.

      Result
      Display (DTC output) Proceed To
      P1621, P1667 and/or P1673 is out put again A
      No DTC output B

    B

    CHECK FOR INTERMITTENT PROBLEMS

    A

    REPLACE ECM