ECD SYSTEM Exhaust Brake System Circuit

WIRING DIAGRAM

A01CH7GE01

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

If the exhaust brake does not operate, perform the following inspection.

PROCEDURE


  1. DTC OUTPUT


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / DTC.

    6. Read the DTCs.

      Tech Tips

      It may be the case that exhaust brake system operation has been prohibited due to DTCs being stored.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO DTC CHART Click here

    A

  2. CHECK ECM


    1. Turn the ignition switch to ON.

    2. A01CHEOE69
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E38-3 (EXB) - E38-1 (E1) Exhaust brake operating 18 to 27 V

      Tech Tips

      Operating conditions for the exhaust brake:


      • The exhaust brake main switch is on.

      • The accelerator pedal is not being operated.

      • The vehicle is moving at a speed of 3 km/h or more.

      • The ABS is not operating.


    NG

    CHECK ELECTRIC VEHICLE CONTROL ECU ASSEMBLY Click here

    OK

  3. CHECK EXHAUST BRAKE WITH BRACKET SOLENOID ASSEMBLY


    1. Inspect the exhaust brake with bracket solenoid assembly Click here.


    NG

    REPLACE EXHAUST BRAKE WITH BRACKET SOLENOID ASSEMBLY

    OK

  4. CHECK EXHAUST RETARDER ASSEMBLY


    1. A01CI0G

      Remove the exhaust retarder assembly.

    2. Check that the butterfly valve is perpendicular to the flange (completely open).

    3. A01CGNI

      Using a vacuum pump, create a vacuum of approximately 67 kPa (503 mmHg, 19.8 in.Hg) in the exhaust brake chamber, and then check that the butterfly valve completely closes and the needle on the pump does not drop.

    4. A01CH2NE01
      Text in Illustration
      *a Valve Cross-section (When viewed from the side with the lever)
      *b Point A
      *c Point B

      With the needle of the pump at the same position as the previous step, check the butterfly valve clearance.

      OK
      0.2 to 0.3 mm
      Result
      Result Proceed to
      OK A
      Butterfly valve does not completely open B
      Needle drops when vacuum is created C
      Needle does not drop when vacuum is created but clearance is not within standard range D

      Tech Tips

      If the results of the inspection are normal, perform troubleshooting for black smoke. Skip over any steps which have already been performed and proceed from the next step Click here.


    B

    ADJUST OR REPLACE EXHAUST RETARDER ASSEMBLY

    C

    REPLACE EXHAUST RETARDER VACUUM CYLINDER ASSEMBLY

    D

    ADJUST EXHAUST RETARDER ASSEMBLY (CLEARANCE ADJUSTMENT)

    A

    CHECK AND REPAIR OR REPLACE VACUUM RELATED PARTS (VACUUM HOSES, LINES)

  5. CHECK ELECTRIC VEHICLE CONTROL ECU ASSEMBLY


    1. Turn the ignition switch to ON.

    2. A01CGNME05
      Text in Illustration
      *a

      Component with harness connected

      (Electric Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E41-16 (CSW1) - E43-5 (GND1)

      IG ON

      Exhaust brake main switch on

      		 18 to 27 V

      IG ON

      Exhaust brake main switch off

      		 0 to 2 V

    NG

    INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY Click here

    OK

  6. CHECK ECM


    1. Turn the ignition switch to ON.

    2. A01CHEOE70
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E37-21 (NUSW) - E38-1 (E1)

      IG ON

      Shift lever in neutral

      		 18 to 27 V

      IG ON

      Shift lever not in neutral

      		 0 to 2 V

    NG

    INSPECT EXHAUST BRAKE NEUTRAL SWITCH ASSEMBLY Click here

    OK

  7. CHECK ELECTRIC VEHICLE CONTROL ECU ASSEMBLY


    1. Turn the ignition switch to ON.

    2. A01CGNME06
      Text in Illustration
      *a

      Component with harness connected

      (Electric Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E43-20 (NSW) - E43-5 (GND1)

      IG ON

      Shift lever in neutral

      		 18 to 27 V

      IG ON

      Shift lever not in neutral

      		 0 to 2 V

    NG

    INSPECT EXHAUST BRAKE NEUTRAL SWITCH ASSEMBLY Click here

    OK

  8. CHECK ECM


    1. Turn the ignition switch to ON.

    2. A01CHEOE71
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E39-21 (CLSW) - E38-1 (E1)

      IG ON

      Clutch pedal released

      		 18 to 27 V

      IG ON

      Clutch pedal depressed

      		 0 to 2 V

    NG

    INSPECT EXHAUST RETARDER SWITCH ASSEMBLY Click here

    OK

  9. CHECK ELECTRIC VEHICLE CONTROL ECU ASSEMBLY


    1. Turn the ignition switch to ON.

    2. A01CGNME07
      Text in Illustration
      *a

      Component with harness connected

      (Electric Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E42-7 (CLTS) - E43-5 (GND1)

      IG ON

      Clutch pedal released

      		 18 to 27 V

      IG ON

      Clutch pedal depressed

      		 0 to 2 V

    NG

    INSPECT EXHAUST RETARDER SWITCH ASSEMBLY Click here

    OK

  10. REPLACE ECM


    1. Replace the ECM Click here.

      Note

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


    NEXT

    END

  11. 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

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  12. INSPECT EXHAUST RETARDER SWITCH ASSEMBLY


    1. Inspect the exhaust retarder switch assembly Click here.


    NG

    REPLACE EXHAUST RETARDER SWITCH ASSEMBLY Click here

    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  13. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY


    1. Inspect the windshield wiper switch assembly Click here.


    NG

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR