ECD SYSTEM, Diagnostic DTC:P0850

DTC Code DTC Name
P0850 Park / Neutral Switch Input Circuit

DESCRIPTION

P0850
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Accelerate and decelerate the vehicle while keeping the vehicle speed within the range of 0 km/h (0 mph) and 80 km/h (50 mph).

There is no change in the exhaust brake neutral switch assembly signal while the vehicle accelerates from 0 km/h (0 mph) to 80 km/h (50 mph).

(1 trip detection logic)

  • Open or short in exhaust brake neutral switch assembly

  • Exhaust brake neutral switch assembly

  • ECM

WIRING DIAGRAM

A01CIVLE05

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

PROCEDURE


  1. INSPECT EXHAUST BRAKE NEUTRAL SWITCH ASSEMBLY


    1. Inspect the exhaust brake neutral switch assembly Click here.


    NG

    REPLACE EXHAUST BRAKE NEUTRAL SWITCH ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (EXHAUST BRAKE NEUTRAL SWITCH ASSEMBLY - ECM)


    1. Disconnect the exhaust brake neutral switch assembly 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
      N2-1 - E37-21 (NUSW) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      N2-1 or E37-21 (NUSW) - Body ground Always 10 kΩ or higher

    4. Reconnect the exhaust brake neutral switch assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR (EXHAUST BRAKE NEUTRAL SWITCH ASSEMBLY - ECM)

    OK

  3. CHECK HARNESS AND CONNECTOR (EXHAUST BRAKE NEUTRAL SWITCH ASSEMBLY - BODY GROUND)


    1. Disconnect the exhaust brake neutral switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      N2-2 - Body ground Always Below 1 Ω

    3. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EXHAUST BRAKE NEUTRAL SWITCH ASSEMBLY - BODY GROUND)

    OK

    REPLACE ECM Click here