ECD SYSTEM, Diagnostic DTC:13

DTC Code DTC Name
13 Engine Speed Sensor Circuit Malfunction (NE Circuit)

DESCRIPTION

The engine speed sensor in the Engine Control System contains a signal plate and a pickup coil for NE signal. The NE signal plate has 56 teeth and is mounted in the injection pump. The NE signal sensor generates 56 signals for every 2 engine revolutions. The ECM detects the engine speed and cam lift position of the injection pump. The ECM uses TDC signal and NE signals for injection timing control. And NE signal is used for injection volume control, also.

DTC No. DTC Detection Condition Trouble Area
13 No NE signal to ECM for 0.5 sec. or more at 680 rpm or more

  • Open or short in engine speed sensor circuit

  • Engine speed sensor

  • ECM
No NE signal to ECM for 2.0 sec. or more during cranking

WIRING DIAGRAM

A01BC2CE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT ENGINE SPEED SENSOR


    1. A01BENSE01

      Check the engine speed sensor installation.

    2. Disconnect the engine speed sensor connector.

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

      Standard resistance
      Tester Connection Specified Condition
      1 - 2 205 to 255 Ω (20°C (68°F))

      Tech Tips

      The engine speed sensor is integrated with the injection pump assembly. If the engine speed sensor is replaced, the injection pump assembly must be replaced in whole.


    NG

    CHECK AND REPLACE INJECTION PUMP ASSEMBLY

    OK

  2. CHECK ECM


    1. A01BE6TE01

      Connect the engine speed sensor connector.

    2. While cranking or idling, measure the waveform according to the value(s) in the table below.

      OK
      Tester Connection Specified Condition
      NE+ (D2-19) - NE- (D2-18) Correct waveform shown
      TDC+ (D2-17) - TDC- (D2-16) Correct waveform shown

    NG

    CHECK HARNESS AND CONNECTOR (ECM - ENGINE SPEED SENSOR) Click here

    OK

    REPLACE ECM

  3. CHECK HARNESS AND CONNECTOR (ECM - ENGINE SPEED SENSOR)


    1. A01BD63E01

      Disconnect the engine speed sensor connector.

    2. Disconnect the ECM D2 connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      NE+ (D18-2) - NE+ (D2-19) Below 1 Ω
      NE- (D18-1) - NE- (D2-18) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      NE+ (D2-19)- NE- (D2-18) 10 kΩ or higher
      NE+ (D2-19) - Body ground 10 kΩ or higher
      NE- (D2-18) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK FOR INTERMITTENT PROBLEMS