ECD SYSTEM, Diagnostic DTC:P1674

DTC Code DTC Name
P1674 Solenoid for Exhaust Brake Circuit Malfunction

DESCRIPTION

The exhaust brake with bracket solenoid assembly opens and closes according to the signals from the ECM. The ECM receives the signals from the exhaust retarder switch assembly. Through the exhaust brake with bracket solenoid assembly, the ECM controls the negative pressure applied to the exhaust retarder assembly.

P1674
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
- Open or short in exhaust brake solenoid circuit for more than 3 seconds with clutch pedal released

  • Open or short in exhaust brake solenoid circuit

  • Exhaust brake with bracket solenoid assembly

  • ECM

WIRING DIAGRAM

A01CHFLE03

INSPECTION PROCEDURE

Note

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

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 moving or stationary, whether the engine was warmed up or not, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. INSPECT EXHAUST BRAKE WITH BRACKET SOLENOID ASSEMBLY


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


    NG

    REPLACE EXHAUST BRAKE WITH BRACKET SOLENOID ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (ECM - EXHAUST BRAKE WITH BRACKET SOLENOID ASSEMBLY)


    1. Disconnect the exhaust brake with bracket solenoid 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
      E33-1 (SOL+) - E38-3 (EXB) Always Below 1 Ω
      E33-2 (SOL-) - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E33-1 (SOL+) or E38-3 (EXB) - Body ground Always 10 kΩ or higher

    4. Reconnect the exhaust brake with bracket solenoid assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - EXHAUST BRAKE WITH BRACKET SOLENOID ASSEMBLY)

    OK

    REPLACE ECM Click here